java.lang.Object | |
↳ | java.awt.image.ColorModel |
Known Direct Subclasses |
Known Indirect Subclasses |
The ColorModel
abstract class encapsulates the
methods for translating a pixel value to color components
(for example, red, green, and blue) and an alpha component.
In order to render an image to the screen, a printer, or another
image, pixel values must be converted to color and alpha components.
As arguments to or return values from methods of this class,
pixels are represented as 32-bit ints or as arrays of primitive types.
The number, order, and interpretation of color components for a
ColorModel
is specified by its ColorSpace
.
A ColorModel
used with pixel data that does not include
alpha information treats all pixels as opaque, which is an alpha
value of 1.0.
This ColorModel
class supports two representations of
pixel values. A pixel value can be a single 32-bit int or an
array of primitive types. The Java(tm) Platform 1.0 and 1.1 APIs
represented pixels as single byte
or single
int
values. For purposes of the ColorModel
class, pixel value arguments were passed as ints. The Java(tm) 2
Platform API introduced additional classes for representing images.
With BufferedImage
or RenderedImage
objects, based on Raster
and SampleModel
classes, pixel
values might not be conveniently representable as a single int.
Consequently, ColorModel
now has methods that accept
pixel values represented as arrays of primitive types. The primitive
type used by a particular ColorModel
object is called its
transfer type.
ColorModel
objects used with images for which pixel values
are not conveniently representable as a single int throw an
IllegalArgumentException
when methods taking a single int pixel
argument are called. Subclasses of ColorModel
must
specify the conditions under which this occurs. This does not
occur with DirectColorModel
or IndexColorModel
objects.
Currently, the transfer types supported by the Java 2D(tm) API are
DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, DataBuffer.TYPE_INT,
DataBuffer.TYPE_SHORT, DataBuffer.TYPE_FLOAT, and DataBuffer.TYPE_DOUBLE.
Most rendering operations will perform much faster when using ColorModels
and images based on the first three of these types. In addition, some
image filtering operations are not supported for ColorModels and
images based on the latter three types.
The transfer type for a particular ColorModel
object is
specified when the object is created, either explicitly or by default.
All subclasses of ColorModel
must specify what the
possible transfer types are and how the number of elements in the
primitive arrays representing pixels is determined.
For BufferedImages
, the transfer type of its
Raster
and of the Raster
object's
SampleModel
(available from the
getTransferType
methods of these classes) must match that
of the ColorModel
. The number of elements in an array
representing a pixel for the Raster
and
SampleModel
(available from the
getNumDataElements
methods of these classes) must match
that of the ColorModel
.
The algorithm used to convert from pixel values to color and alpha
components varies by subclass. For example, there is not necessarily
a one-to-one correspondence between samples obtained from the
SampleModel
of a BufferedImage
object's
Raster
and color/alpha components. Even when
there is such a correspondence, the number of bits in a sample is not
necessarily the same as the number of bits in the corresponding color/alpha
component. Each subclass must specify how the translation from
pixel values to color/alpha components is done.
Methods in the ColorModel
class use two different
representations of color and alpha components - a normalized form
and an unnormalized form. In the normalized form, each component is a
float
value between some minimum and maximum values. For
the alpha component, the minimum is 0.0 and the maximum is 1.0. For
color components the minimum and maximum values for each component can
be obtained from the ColorSpace
object. These values
will often be 0.0 and 1.0 (e.g. normalized component values for the
default sRGB color space range from 0.0 to 1.0), but some color spaces
have component values with different upper and lower limits. These
limits can be obtained using the getMinValue
and
getMaxValue
methods of the ColorSpace
class. Normalized color component values are not premultiplied.
All ColorModels
must support the normalized form.
In the unnormalized
form, each component is an unsigned integral value between 0 and
2n - 1, where n is the number of significant bits for a
particular component. If pixel values for a particular
ColorModel
represent color samples premultiplied by
the alpha sample, unnormalized color component values are
also premultiplied. The unnormalized form is used only with instances
of ColorModel
whose ColorSpace
has minimum
component values of 0.0 for all components and maximum values of
1.0 for all components.
The unnormalized form for color and alpha components can be a convenient
representation for ColorModels
whose normalized component
values all lie
between 0.0 and 1.0. In such cases the integral value 0 maps to 0.0 and
the value 2n - 1 maps to 1.0. In other cases, such as
when the normalized component values can be either negative or positive,
the unnormalized form is not convenient. Such ColorModel
objects throw an IllegalArgumentException
when methods involving
an unnormalized argument are called. Subclasses of ColorModel
must specify the conditions under which this occurs.
[Expand]
Inherited Constants | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
From interface
java.awt.Transparency
|
Fields | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
pixel_bits | The total number of bits in the pixel. | ||||||||||
transferType | Data type of the array used to represent pixel values. |
Public Constructors | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Constructs a
ColorModel that translates pixels of the
specified number of bits to color/alpha components. |
Protected Constructors | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Constructs a
ColorModel that translates pixel values
to color/alpha components. |
Public Methods | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Forces the raster data to match the state specified in the
isAlphaPremultiplied variable, assuming the data is
currently correctly described by this ColorModel . | |||||||||||
Creates a
SampleModel with the specified width and
height that has a data layout compatible with this
ColorModel . | |||||||||||
Creates a
WritableRaster with the specified width and
height that has a data layout (SampleModel ) compatible
with this ColorModel . | |||||||||||
Tests if the specified
Object is an instance of
ColorModel and if it equals this
ColorModel . | |||||||||||
Disposes of system resources associated with this
ColorModel once this ColorModel is no
longer referenced. | |||||||||||
Returns the alpha component for the specified pixel, scaled
from 0 to 255.
| |||||||||||
Returns the alpha component for the specified pixel, scaled
from 0 to 255.
| |||||||||||
Returns a
Raster representing the alpha channel of an
image, extracted from the input Raster , provided that
pixel values of this ColorModel represent color and
alpha information as separate spatial bands (e.g. | |||||||||||
Returns the blue color component for the specified pixel, scaled
from 0 to 255 in the default RGB
ColorSpace , sRGB. | |||||||||||
Returns the blue color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace, sRGB.
| |||||||||||
Returns the
ColorSpace associated with this
ColorModel . | |||||||||||
Returns an array of the number of bits per color/alpha component.
| |||||||||||
Returns the number of bits for the specified color/alpha component.
| |||||||||||
Returns an array of unnormalized color/alpha components given a pixel
in this
ColorModel . | |||||||||||
Returns an array of unnormalized color/alpha components given a pixel
in this
ColorModel . | |||||||||||
Returns a pixel value represented as an
int in this
ColorModel , given an array of normalized color/alpha
components. | |||||||||||
Returns a pixel value represented as an
int in this
ColorModel , given an array of unnormalized color/alpha
components. | |||||||||||
Returns a data element array representation of a pixel in this
ColorModel , given an array of unnormalized color/alpha
components. | |||||||||||
Returns a data element array representation of a pixel in this
ColorModel , given an integer pixel representation in
the default RGB color model. | |||||||||||
Returns a data element array representation of a pixel in this
ColorModel , given an array of normalized color/alpha
components. | |||||||||||
Returns the green color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace, sRGB.
| |||||||||||
Returns the green color component for the specified pixel, scaled
from 0 to 255 in the default RGB
ColorSpace , sRGB. | |||||||||||
Returns an array of all of the color/alpha components in normalized
form, given a pixel in this
ColorModel . | |||||||||||
Returns an array of all of the color/alpha components in normalized
form, given an unnormalized component array.
| |||||||||||
Returns the number of color components in this
ColorModel . | |||||||||||
Returns the number of components, including alpha, in this
ColorModel . | |||||||||||
Returns the number of bits per pixel described by this
ColorModel . | |||||||||||
Returns the color/alpha components for the specified pixel in the
default RGB color model format.
| |||||||||||
Returns the color/alpha components of the pixel in the default
RGB color model format.
| |||||||||||
Returns a
DirectColorModel that describes the default
format for integer RGB values used in many of the methods in the
AWT image interfaces for the convenience of the programmer. | |||||||||||
Returns the red color component for the specified pixel, scaled
from 0 to 255 in the default RGB
ColorSpace , sRGB. | |||||||||||
Returns the red color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace, sRGB.
| |||||||||||
Returns the transfer type of this
ColorModel . | |||||||||||
Returns the transparency.
| |||||||||||
Returns an array of all of the color/alpha components in unnormalized
form, given a normalized component array.
| |||||||||||
Returns whether or not alpha is supported in this
ColorModel . | |||||||||||
Returns the hash code for this ColorModel.
| |||||||||||
Returns whether or not the alpha has been premultiplied in the
pixel values to be translated by this
ColorModel . | |||||||||||
Returns
true if raster is compatible
with this ColorModel and false if it is
not. | |||||||||||
Checks if the
SampleModel is compatible with this
ColorModel . | |||||||||||
Returns the
String representation of the contents of
this ColorModel object. |
[Expand]
Inherited Methods | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
From class
java.lang.Object
| |||||||||||
From interface
java.awt.Transparency
|
The total number of bits in the pixel.
Data type of the array used to represent pixel values.
Constructs a ColorModel
that translates pixels of the
specified number of bits to color/alpha components. The color
space is the default RGB ColorSpace
, which is sRGB.
Pixel values are assumed to include alpha information. If color
and alpha information are represented in the pixel value as
separate spatial bands, the color bands are assumed not to be
premultiplied with the alpha value. The transparency type is
java.awt.Transparency.TRANSLUCENT. The transfer type will be the
smallest of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT,
or DataBuffer.TYPE_INT that can hold a single pixel
(or DataBuffer.TYPE_UNDEFINED if bits is greater
than 32). Since this constructor has no information about the
number of bits per color and alpha component, any subclass calling
this constructor should override any method that requires this
information.
bits | the number of bits of a pixel |
---|
IllegalArgumentException | if the number
of bits in bits is less than 1
|
---|
Constructs a ColorModel
that translates pixel values
to color/alpha components. Color components will be in the
specified ColorSpace
. pixel_bits
is the
number of bits in the pixel values. The bits array
specifies the number of significant bits per color and alpha component.
Its length should be the number of components in the
ColorSpace
if there is no alpha information in the
pixel values, or one more than this number if there is alpha
information. hasAlpha
indicates whether or not alpha
information is present. The boolean
isAlphaPremultiplied
specifies how to interpret pixel
values in which color and alpha information are represented as
separate spatial bands. If the boolean
is true
, color samples are assumed to have been
multiplied by the alpha sample. The transparency
specifies what alpha values can be represented by this color model.
The transfer type is the type of primitive array used to represent
pixel values. Note that the bits array contains the number of
significant bits per color/alpha component after the translation
from pixel values. For example, for an
IndexColorModel
with pixel_bits
equal to
16, the bits array might have four elements with each element set
to 8.
pixel_bits | the number of bits in the pixel values |
---|---|
bits | array that specifies the number of significant bits per color and alpha component |
cspace | the specified ColorSpace |
hasAlpha | true if alpha information is present;
false otherwise |
isAlphaPremultiplied | true if color samples are
assumed to be premultiplied by the alpha samples;
false otherwise |
transparency | what alpha values can be represented by this color model |
transferType | the type of the array used to represent pixel values |
IllegalArgumentException | if the length of
the bit array is less than the number of color or alpha
components in this ColorModel , or if the
transparency is not a valid value. |
---|---|
IllegalArgumentException | if the sum of the number
of bits in bits is less than 1 or if
any of the elements in bits is less than 0. |
Forces the raster data to match the state specified in the
isAlphaPremultiplied
variable, assuming the data is
currently correctly described by this ColorModel
. It
may multiply or divide the color raster data by alpha, or do
nothing if the data is in the correct state. If the data needs to
be coerced, this method will also return an instance of this
ColorModel
with the isAlphaPremultiplied
flag set appropriately. This method will throw a
UnsupportedOperationException
if it is not supported
by this ColorModel
.
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
raster | the WritableRaster data |
---|---|
isAlphaPremultiplied | true if the alpha is
premultiplied; false otherwise |
ColorModel
object that represents the
coerced data.
Creates a SampleModel
with the specified width and
height that has a data layout compatible with this
ColorModel
.
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
w | the width to apply to the new SampleModel |
---|---|
h | the height to apply to the new SampleModel |
SampleModel
object with the specified
width and height.UnsupportedOperationException | if this
method is not supported by this ColorModel |
---|
Creates a WritableRaster
with the specified width and
height that has a data layout (SampleModel
) compatible
with this ColorModel
.
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
w | the width to apply to the new WritableRaster |
---|---|
h | the height to apply to the new WritableRaster |
WritableRaster
object with the specified
width and height.UnsupportedOperationException | if this
method is not supported by this ColorModel |
---|
Tests if the specified Object
is an instance of
ColorModel
and if it equals this
ColorModel
.
obj | the Object to test for equality |
---|
true
if the specified Object
is an instance of ColorModel
and equals this
ColorModel
; false
otherwise.
Disposes of system resources associated with this
ColorModel
once this ColorModel
is no
longer referenced.
Returns the alpha component for the specified pixel, scaled
from 0 to 255. The pixel value is specified by an array of data
elements of type transferType passed in as an object reference.
If inData is not a primitive array of type transferType, a
ClassCastException
is thrown. An
ArrayIndexOutOfBoundsException
is thrown if
inData
is not large enough to hold a pixel value for
this ColorModel
.
If this transferType
is not supported, a
UnsupportedOperationException
will be
thrown. Since
ColorModel
is an abstract class, any instance
must be an instance of a subclass. Subclasses inherit the
implementation of this method and if they don't override it, this
method throws an exception if the subclass uses a
transferType
other than
DataBuffer.TYPE_BYTE
,
DataBuffer.TYPE_USHORT
, or
DataBuffer.TYPE_INT
.
inData | the specified pixel |
---|
ClassCastException | if inData
is not a primitive array of type transferType |
---|---|
ArrayIndexOutOfBoundsException | if
inData is not large enough to hold a pixel value
for this ColorModel |
UnsupportedOperationException | if this
tranferType is not supported by this
ColorModel
|
Returns the alpha component for the specified pixel, scaled
from 0 to 255. The pixel value is specified as an int.
An IllegalArgumentException
is thrown if pixel
values for this ColorModel
are not conveniently
representable as a single int.
pixel | the specified pixel |
---|
Returns a Raster
representing the alpha channel of an
image, extracted from the input Raster
, provided that
pixel values of this ColorModel
represent color and
alpha information as separate spatial bands (e.g.
ComponentColorModel
and DirectColorModel
).
This method assumes that Raster
objects associated
with such a ColorModel
store the alpha band, if
present, as the last band of image data. Returns null
if there is no separate spatial alpha channel associated with this
ColorModel
. If this is an
IndexColorModel
which has alpha in the lookup table,
this method will return null
since
there is no spatially discrete alpha channel.
This method will create a new Raster
(but will share
the data array).
Since ColorModel
is an abstract class, any instance
is an instance of a subclass. Subclasses must override this
method to get any behavior other than returning null
because the implementation in this abstract class returns
null
.
raster | the specified Raster |
---|
Raster
representing the alpha channel of
an image, obtained from the specified Raster
.
Returns the blue color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace
, sRGB. A
color conversion is done if necessary. The pixel value is
specified by an array of data elements of type transferType passed
in as an object reference. The returned value is a non
pre-multiplied value. For example, if the alpha is premultiplied,
this method divides it out before returning the value. If the
alpha value is 0, the blue value will be 0. If
inData
is not a primitive array of type transferType,
a ClassCastException
is thrown. An
ArrayIndexOutOfBoundsException
is
thrown if inData
is not large enough to hold a pixel
value for this ColorModel
.
If this transferType
is not supported, a
UnsupportedOperationException
will be
thrown. Since
ColorModel
is an abstract class, any instance
must be an instance of a subclass. Subclasses inherit the
implementation of this method and if they don't override it, this
method throws an exception if the subclass uses a
transferType
other than
DataBuffer.TYPE_BYTE
,
DataBuffer.TYPE_USHORT
, or
DataBuffer.TYPE_INT
.
inData | an array of pixel values |
---|
ClassCastException | if inData
is not a primitive array of type transferType |
---|---|
ArrayIndexOutOfBoundsException | if
inData is not large enough to hold a pixel value
for this ColorModel |
UnsupportedOperationException | if this
tranferType is not supported by this
ColorModel
|
Returns the blue color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion
is done if necessary. The pixel value is specified as an int.
An IllegalArgumentException
is thrown if pixel values
for this ColorModel
are not conveniently representable
as a single int. The returned value is a non pre-multiplied
value, for example, if the alpha is premultiplied, this method
divides it out before returning the value. If the alpha value is
0, the blue value is 0.
pixel | the specified pixel |
---|
Returns the ColorSpace
associated with this
ColorModel
.
ColorSpace
of this
ColorModel
.
Returns an array of the number of bits per color/alpha component.
The array contains the color components in the order specified by the
ColorSpace
, followed by the alpha component, if
present.
Returns the number of bits for the specified color/alpha component.
Color components are indexed in the order specified by the
ColorSpace
. Typically, this order reflects the name
of the color space type. For example, for TYPE_RGB, index 0
corresponds to red, index 1 to green, and index 2
to blue. If this ColorModel
supports alpha, the alpha
component corresponds to the index following the last color
component.
componentIdx | the index of the color/alpha component |
---|
ArrayIndexOutOfBoundsException | if componentIdx
is greater than the number of components or
less than zero |
---|---|
NullPointerException | if the number of bits array is
null
|
Returns an array of unnormalized color/alpha components given a pixel
in this ColorModel
. The pixel value is specified as
an int
. An IllegalArgumentException
will be thrown if pixel values for this ColorModel
are
not conveniently representable as a single int
or if
color component values for this ColorModel
are not
conveniently representable in the unnormalized form.
For example, this method can be used to retrieve the
components for a specific pixel value in a
DirectColorModel
. If the components array is
null
, a new array will be allocated. The
components array will be returned. Color/alpha components are
stored in the components array starting at offset
(even if the array is allocated by this method). An
ArrayIndexOutOfBoundsException
is thrown if the
components array is not null
and is not large
enough to hold all the color and alpha components (starting at offset).
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
pixel | the specified pixel |
---|---|
components | the array to receive the color and alpha components of the specified pixel |
offset | the offset into the components array at
which to start storing the color and alpha components |
UnsupportedOperationException | if this
method is not supported by this ColorModel
|
---|
Returns an array of unnormalized color/alpha components given a pixel
in this ColorModel
. The pixel value is specified by
an array of data elements of type transferType passed in as an
object reference. If pixel
is not a primitive array
of type transferType, a ClassCastException
is thrown.
An IllegalArgumentException
will be thrown if color
component values for this ColorModel
are not
conveniently representable in the unnormalized form.
An ArrayIndexOutOfBoundsException
is
thrown if pixel
is not large enough to hold a pixel
value for this ColorModel
.
This method can be used to retrieve the components for a specific
pixel value in any ColorModel
. If the components
array is null
, a new array will be allocated. The
components array will be returned. Color/alpha components are
stored in the components
array starting at
offset
(even if the array is allocated by this
method). An ArrayIndexOutOfBoundsException
is thrown if the components array is not null
and is
not large enough to hold all the color and alpha components
(starting at offset
).
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
pixel | the specified pixel |
---|---|
components | an array that receives the color and alpha components of the specified pixel |
offset | the index into the components array at
which to begin storing the color and alpha components of the
specified pixel |
UnsupportedOperationException | if this
method is not supported by this ColorModel
|
---|
Returns a pixel value represented as an int
in this
ColorModel
, given an array of normalized color/alpha
components. This method will throw an
IllegalArgumentException
if pixel values for this
ColorModel
are not conveniently representable as a
single int
. An
ArrayIndexOutOfBoundsException
is thrown if the
normComponents
array is not large enough to hold all the
color and alpha components (starting at normOffset
).
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. The default implementation
of this method in this abstract class first converts from the
normalized form to the unnormalized form and then calls
getDataElement(int[], int)
. Subclasses which may
have instances which do not support the unnormalized form must
override this method.
normComponents | an array of normalized color and alpha components |
---|---|
normOffset | the index into normComponents at which to
begin retrieving the color and alpha components |
int
pixel value in this
ColorModel
corresponding to the specified components.IllegalArgumentException | if
pixel values for this ColorModel are not
conveniently representable as a single int |
---|---|
ArrayIndexOutOfBoundsException | if
the normComponents array is not large enough to
hold all of the color and alpha components starting at
normOffset |
Returns a pixel value represented as an int
in this
ColorModel
, given an array of unnormalized color/alpha
components. This method will throw an
IllegalArgumentException
if component values for this
ColorModel
are not conveniently representable as a
single int
or if color component values for this
ColorModel
are not conveniently representable in the
unnormalized form. An
ArrayIndexOutOfBoundsException
is thrown if the
components
array is not large enough to hold all the
color and alpha components (starting at offset
).
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
components | an array of unnormalized color and alpha components |
---|---|
offset | the index into components at which to
begin retrieving the color and alpha components |
int
pixel value in this
ColorModel
corresponding to the specified components.IllegalArgumentException | if
pixel values for this ColorModel are not
conveniently representable as a single int |
---|---|
IllegalArgumentException | if
component values for this ColorModel are not
conveniently representable in the unnormalized form |
ArrayIndexOutOfBoundsException | if
the components array is not large enough to
hold all of the color and alpha components starting at
offset |
UnsupportedOperationException | if this
method is not supported by this ColorModel
|
Returns a data element array representation of a pixel in this
ColorModel
, given an array of unnormalized color/alpha
components. This array can then be passed to the
setDataElements
method of a WritableRaster
object. This method will throw an IllegalArgumentException
if color component values for this ColorModel
are not
conveniently representable in the unnormalized form.
An ArrayIndexOutOfBoundsException
is thrown
if the components
array is not large enough to hold
all the color and alpha components (starting at
offset
). If the obj
variable is
null
, a new array will be allocated. If
obj
is not null
, it must be a primitive
array of type transferType; otherwise, a
ClassCastException
is thrown. An
ArrayIndexOutOfBoundsException
is thrown if
obj
is not large enough to hold a pixel value for this
ColorModel
.
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
components | an array of unnormalized color and alpha components |
---|---|
offset | the index into components at which to
begin retrieving color and alpha components |
obj | the Object representing an array of color
and alpha components |
Object
representing an array of color and
alpha components.ClassCastException | if obj
is not a primitive array of type transferType |
---|---|
ArrayIndexOutOfBoundsException | if
obj is not large enough to hold a pixel value
for this ColorModel or the components
array is not large enough to hold all of the color and alpha
components starting at offset |
IllegalArgumentException | if
component values for this ColorModel are not
conveniently representable in the unnormalized form |
UnsupportedOperationException | if this
method is not supported by this ColorModel |
Returns a data element array representation of a pixel in this
ColorModel
, given an integer pixel representation in
the default RGB color model.
This array can then be passed to the
setDataElements(int, int, int, int, Object)
method of
a WritableRaster
object. If the pixel variable is
null
, a new array will be allocated. If
pixel
is not
null
, it must be a primitive array of type
transferType
; otherwise, a
ClassCastException
is thrown. An
ArrayIndexOutOfBoundsException
is thrown if
pixel
is
not large enough to hold a pixel value for this
ColorModel
. The pixel array is returned.
If this transferType
is not supported, a
UnsupportedOperationException
will be
thrown. Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
rgb | the integer pixel representation in the default RGB color model |
---|---|
pixel | the specified pixel |
ColorModel
.ClassCastException | if pixel
is not a primitive array of type transferType |
---|---|
ArrayIndexOutOfBoundsException | if
pixel is not large enough to hold a pixel value
for this ColorModel |
UnsupportedOperationException | if this
method is not supported by this ColorModel |
Returns a data element array representation of a pixel in this
ColorModel
, given an array of normalized color/alpha
components. This array can then be passed to the
setDataElements
method of a WritableRaster
object. An ArrayIndexOutOfBoundsException
is thrown
if the normComponents
array is not large enough to hold
all the color and alpha components (starting at
normOffset
). If the obj
variable is
null
, a new array will be allocated. If
obj
is not null
, it must be a primitive
array of type transferType; otherwise, a
ClassCastException
is thrown. An
ArrayIndexOutOfBoundsException
is thrown if
obj
is not large enough to hold a pixel value for this
ColorModel
.
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. The default implementation
of this method in this abstract class first converts from the
normalized form to the unnormalized form and then calls
getDataElement(int[], int, Object)
. Subclasses which may
have instances which do not support the unnormalized form must
override this method.
normComponents | an array of normalized color and alpha components |
---|---|
normOffset | the index into normComponents at which to
begin retrieving color and alpha components |
obj | a primitive data array to hold the returned pixel |
Object
which is a primitive data array
representation of a pixelClassCastException | if obj
is not a primitive array of type transferType |
---|---|
ArrayIndexOutOfBoundsException | if
obj is not large enough to hold a pixel value
for this ColorModel or the normComponents
array is not large enough to hold all of the color and alpha
components starting at normOffset |
Returns the green color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion
is done if necessary. The pixel value is specified as an int.
An IllegalArgumentException
is thrown if pixel
values for this ColorModel
are not conveniently
representable as a single int. The returned value is a non
pre-multiplied value. For example, if the alpha is premultiplied,
this method divides it out before returning
the value. If the alpha value is 0, the green value is 0.
pixel | the specified pixel |
---|
Returns the green color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace
, sRGB. A
color conversion is done if necessary. The pixel value is
specified by an array of data elements of type transferType passed
in as an object reference. The returned value will be a non
pre-multiplied value. For example, if the alpha is premultiplied,
this method divides it out before returning the value. If the
alpha value is 0, the green value is 0. If inData
is
not a primitive array of type transferType, a
ClassCastException
is thrown. An
ArrayIndexOutOfBoundsException
is thrown if
inData
is not large enough to hold a pixel value for
this ColorModel
.
If this transferType
is not supported, a
UnsupportedOperationException
will be
thrown. Since
ColorModel
is an abstract class, any instance
must be an instance of a subclass. Subclasses inherit the
implementation of this method and if they don't override it, this
method throws an exception if the subclass uses a
transferType
other than
DataBuffer.TYPE_BYTE
,
DataBuffer.TYPE_USHORT
, or
DataBuffer.TYPE_INT
.
inData | an array of pixel values |
---|
if inData
is not a primitive array of type transferType |
|
if
inData is not large enough to hold a pixel value
for this ColorModel |
|
if this
tranferType is not supported by this
ColorModel
|
Returns an array of all of the color/alpha components in normalized
form, given a pixel in this ColorModel
. The pixel
value is specified by an array of data elements of type transferType
passed in as an object reference. If pixel is not a primitive array
of type transferType, a ClassCastException
is thrown.
An ArrayIndexOutOfBoundsException
is thrown if
pixel
is not large enough to hold a pixel value for this
ColorModel
.
Normalized components are float values between a per component minimum
and maximum specified by the ColorSpace
object for this
ColorModel
. If the
normComponents
array is null
, a new array
will be allocated. The normComponents
array
will be returned. Color/alpha components are stored in the
normComponents
array starting at
normOffset
(even if the array is allocated by this
method). An ArrayIndexOutOfBoundsException
is thrown
if the normComponents
array is not null
and is not large enough to hold all the color and alpha components
(starting at normOffset
).
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. The default implementation
of this method in this abstract class first retrieves color and alpha
components in the unnormalized form using
getComponents(Object, int[], int)
and then calls
getNormalizedComponents(int[], int, float[], int)
.
Subclasses which may
have instances which do not support the unnormalized form must
override this method.
pixel | the specified pixel |
---|---|
normComponents | an array to receive the normalized components |
normOffset | the offset into the normComponents
array at which to start storing normalized components |
ClassCastException | if pixel is not a primitive
array of type transferType |
---|---|
ArrayIndexOutOfBoundsException | if
normComponents is not large enough to hold all
color and alpha components starting at normOffset |
ArrayIndexOutOfBoundsException | if
pixel is not large enough to hold a pixel
value for this ColorModel . |
UnsupportedOperationException | if the
constructor of this ColorModel called the
super(bits) constructor, but did not
override this method. See the constructor,
ColorModel(int) . |
UnsupportedOperationException | if this method is unable to determine the number of bits per component |
Returns an array of all of the color/alpha components in normalized
form, given an unnormalized component array. Unnormalized components
are unsigned integral values between 0 and 2n - 1, where
n is the number of bits for a particular component. Normalized
components are float values between a per component minimum and
maximum specified by the ColorSpace
object for this
ColorModel
. An IllegalArgumentException
will be thrown if color component values for this
ColorModel
are not conveniently representable in the
unnormalized form. If the
normComponents
array is null
, a new array
will be allocated. The normComponents
array
will be returned. Color/alpha components are stored in the
normComponents
array starting at
normOffset
(even if the array is allocated by this
method). An ArrayIndexOutOfBoundsException
is thrown
if the normComponents
array is not null
and is not large enough to hold all the color and alpha components
(starting at normOffset
). An
IllegalArgumentException
is thrown if the
components
array is not large enough to hold all the
color and alpha components starting at offset
.
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. The default implementation
of this method in this abstract class assumes that component values
for this class are conveniently representable in the unnormalized
form. Therefore, subclasses which may
have instances which do not support the unnormalized form must
override this method.
components | an array containing unnormalized components |
---|---|
offset | the offset into the components array at
which to start retrieving unnormalized components |
normComponents | an array that receives the normalized components |
normOffset | the index into normComponents at
which to begin storing normalized components |
IllegalArgumentException | If the component values for this
ColorModel are not conveniently representable in the
unnormalized form. |
---|---|
UnsupportedOperationException | if the
constructor of this ColorModel called the
super(bits) constructor, but did not
override this method. See the constructor,
ColorModel(int) . |
UnsupportedOperationException | if this method is unable to determine the number of bits per component |
Returns the number of color components in this
ColorModel
.
This is the number of components returned by
getNumComponents()
.
ColorModel
.Returns the number of components, including alpha, in this
ColorModel
. This is equal to the number of color
components, optionally plus one, if there is an alpha component.
ColorModel
Returns the number of bits per pixel described by this
ColorModel
.
Returns the color/alpha components for the specified pixel in the
default RGB color model format. A color conversion is done if
necessary. The pixel value is specified by an array of data
elements of type transferType passed in as an object reference.
If inData is not a primitive array of type transferType, a
ClassCastException
is thrown. An
ArrayIndexOutOfBoundsException
is
thrown if inData
is not large enough to hold a pixel
value for this ColorModel
.
The returned value will be in a non pre-multiplied format, i.e. if
the alpha is premultiplied, this method will divide it out of the
color components (if the alpha value is 0, the color values will be 0).
inData | the specified pixel |
---|
Returns the color/alpha components of the pixel in the default
RGB color model format. A color conversion is done if necessary.
The pixel value is specified as an int.
An IllegalArgumentException
thrown if pixel values
for this ColorModel
are not conveniently representable
as a single int. The returned value is in a non
pre-multiplied format. For example, if the alpha is premultiplied,
this method divides it out of the color components. If the alpha
value is 0, the color values are 0.
pixel | the specified pixel |
---|
Returns a DirectColorModel
that describes the default
format for integer RGB values used in many of the methods in the
AWT image interfaces for the convenience of the programmer.
The color space is the default ColorSpace
, sRGB.
The format for the RGB values is an integer with 8 bits
each of alpha, red, green, and blue color components ordered
correspondingly from the most significant byte to the least
significant byte, as in: 0xAARRGGBB. Color components are
not premultiplied by the alpha component. This format does not
necessarily represent the native or the most efficient
ColorModel
for a particular device or for all images.
It is merely used as a common color model format.
DirectColorModel
object describing default
RGB values.
Returns the red color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace
, sRGB. A
color conversion is done if necessary. The pixel value is
specified by an array of data elements of type transferType passed
in as an object reference. The returned value is a non
pre-multiplied value. For example, if alpha is premultiplied,
this method divides it out before returning
the value. If the alpha value is 0, the red value is 0.
If inData
is not a primitive array of type
transferType, a ClassCastException
is thrown. An
ArrayIndexOutOfBoundsException
is thrown if
inData
is not large enough to hold a pixel value for
this ColorModel
.
If this transferType
is not supported, a
UnsupportedOperationException
will be
thrown. Since
ColorModel
is an abstract class, any instance
must be an instance of a subclass. Subclasses inherit the
implementation of this method and if they don't override it, this
method throws an exception if the subclass uses a
transferType
other than
DataBuffer.TYPE_BYTE
,
DataBuffer.TYPE_USHORT
, or
DataBuffer.TYPE_INT
.
inData | an array of pixel values |
---|
ClassCastException | if inData
is not a primitive array of type transferType |
---|---|
ArrayIndexOutOfBoundsException | if
inData is not large enough to hold a pixel value
for this ColorModel |
UnsupportedOperationException | if this
tranferType is not supported by this
ColorModel
|
Returns the red color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion
is done if necessary. The pixel value is specified as an int.
An IllegalArgumentException
is thrown if pixel
values for this ColorModel
are not conveniently
representable as a single int. The returned value is not a
pre-multiplied value. For example, if the
alpha is premultiplied, this method divides it out before returning
the value. If the alpha value is 0, the red value is 0.
pixel | a specified pixel |
---|
Returns the transfer type of this ColorModel
.
The transfer type is the type of primitive array used to represent
pixel values as arrays.
Returns the transparency. Returns either OPAQUE, BITMASK, or TRANSLUCENT.
ColorModel
.Returns an array of all of the color/alpha components in unnormalized
form, given a normalized component array. Unnormalized components
are unsigned integral values between 0 and 2n - 1, where
n is the number of bits for a particular component. Normalized
components are float values between a per component minimum and
maximum specified by the ColorSpace
object for this
ColorModel
. An IllegalArgumentException
will be thrown if color component values for this
ColorModel
are not conveniently representable in the
unnormalized form. If the
components
array is null
, a new array
will be allocated. The components
array will
be returned. Color/alpha components are stored in the
components
array starting at offset
(even
if the array is allocated by this method). An
ArrayIndexOutOfBoundsException
is thrown if the
components
array is not null
and is not
large enough to hold all the color and alpha
components (starting at offset
). An
IllegalArgumentException
is thrown if the
normComponents
array is not large enough to hold
all the color and alpha components starting at
normOffset
.
normComponents | an array containing normalized components |
---|---|
normOffset | the offset into the normComponents
array at which to start retrieving normalized components |
components | an array that receives the components from
normComponents |
offset | the index into components at which to
begin storing normalized components from
normComponents |
IllegalArgumentException | If the component values for this
ColorModel are not conveniently representable in the
unnormalized form. |
---|---|
IllegalArgumentException | if the length of
normComponents minus normOffset
is less than numComponents |
UnsupportedOperationException | if the
constructor of this ColorModel called the
super(bits) constructor, but did not
override this method. See the constructor,
ColorModel(int) .
|
Returns whether or not alpha is supported in this
ColorModel
.
true
if alpha is supported in this
ColorModel
; false
otherwise.
Returns the hash code for this ColorModel.
Returns whether or not the alpha has been premultiplied in the
pixel values to be translated by this ColorModel
.
If the boolean is true
, this ColorModel
is to be used to interpret pixel values in which color and alpha
information are represented as separate spatial bands, and color
samples are assumed to have been multiplied by the
alpha sample.
true
if the alpha values are premultiplied
in the pixel values to be translated by this
ColorModel
; false
otherwise.
Returns true
if raster
is compatible
with this ColorModel
and false
if it is
not.
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
raster | the Raster object to test for compatibility |
---|
true
if raster
is compatible
with this ColorModel
.UnsupportedOperationException | if this
method has not been implemented for this
ColorModel
|
---|
Checks if the SampleModel
is compatible with this
ColorModel
.
Since ColorModel
is an abstract class,
any instance is an instance of a subclass. Subclasses must
override this method since the implementation in this abstract
class throws an UnsupportedOperationException
.
sm | the specified SampleModel |
---|
true
if the specified SampleModel
is compatible with this ColorModel
; false
otherwise.UnsupportedOperationException | if this
method is not supported by this ColorModel |
---|
Returns the String
representation of the contents of
this ColorModel
object.
String
representing the contents of this
ColorModel
object.