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java.lang.Object | +--javax.media.jai.OperationDescriptorImpl | +--javax.media.jai.operator.SubtractConstDescriptor
An OperationDescriptor
describing the "SubtractConst"
operation.
The SubtractConst operation takes one rendered or renderable source image and an array of double constants, and subtracts a constant from every pixel of its corresponding band of the source. If the number of constants supplied is less than the number of bands of the destination, then the constant from entry 0 is applied to all the bands. Otherwise, a constant from a different entry is applied to each band.
By default, the destination image bounds, data type, and number of bands are the same as the source image. If the result of the operation underflows/overflows the minimum/maximum value supported by the destination data type, then it will be clamped to the minimum/maximum value respectively.
The destination pixel values are defined by the pseudocode:
if (constants.length < dstNumBands) { dst[x][y][b] = src[x][y][b] - constants[0]; } else { dst[x][y][b] = src[x][y][b] - constants[b]; }
Name | Value | |
---|---|---|
GlobalName | SubtractConst | |
LocalName | SubtractConst | |
Vendor | com.sun.media.jai | |
Description | Subtracts constants from an image. | |
DocURL | http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/SubtractConstDescriptor.html | |
Version | 1.0 | |
arg0Desc | The constants to be subtracted. |
Name | Class Type | Default Value |
---|---|---|
constants | double[] | NO_PARAMETER_DEFAULT |
OperationDescriptor
, Serialized FormFields inherited from class javax.media.jai.OperationDescriptorImpl |
resources, sourceNames, supportedModes |
Fields inherited from interface javax.media.jai.OperationDescriptor |
NO_PARAMETER_DEFAULT |
Constructor Summary | |
SubtractConstDescriptor()
Constructor. |
Method Summary | |
static RenderedOp |
create(RenderedImage source0,
double[] constants,
RenderingHints hints)
Subtracts constants from an image. |
static RenderableOp |
createRenderable(RenderableImage source0,
double[] constants,
RenderingHints hints)
Subtracts constants from an image. |
boolean |
isRenderableSupported()
Returns true since renderable operation is supported. |
protected boolean |
validateParameters(ParameterBlock args,
StringBuffer message)
Validates the input parameter. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public SubtractConstDescriptor()
Method Detail |
public boolean isRenderableSupported()
true
since renderable operation is supported.isRenderableSupported
in class OperationDescriptorImpl
javax.media.jai.OperationDescriptorImpl
OperationDescriptorImpl.isModeSupported(java.lang.String)
protected boolean validateParameters(ParameterBlock args, StringBuffer message)
In addition to the standard checks performed by the superclass method, this method checks that the length of the "constants" array is at least 1.
validateParameters
in class OperationDescriptorImpl
javax.media.jai.OperationDescriptorImpl
IllegalArgumentException
- if args
is null
.IllegalArgumentException
- if msg
is null
and the validation fails.OperationDescriptorImpl.validateParameters(java.lang.String, java.awt.image.renderable.ParameterBlock, java.lang.StringBuffer)
public static RenderedOp create(RenderedImage source0, double[] constants, RenderingHints hints)
Creates a ParameterBlockJAI
from all
supplied arguments except hints
and invokes
JAI.create(String,ParameterBlock,RenderingHints)
.
source0
- RenderedImage
source 0.constants
- The constants to be subtracted.hints
- The RenderingHints
to use.
May be null
.RenderedOp
destination.IllegalArgumentException
- if source0
is null
.IllegalArgumentException
- if constants
is null
.JAI
,
ParameterBlockJAI
,
RenderedOp
public static RenderableOp createRenderable(RenderableImage source0, double[] constants, RenderingHints hints)
Creates a ParameterBlockJAI
from all
supplied arguments except hints
and invokes
JAI.createRenderable(String,ParameterBlock,RenderingHints)
.
source0
- RenderableImage
source 0.constants
- The constants to be subtracted.hints
- The RenderingHints
to use.
May be null
.RenderableOp
destination.IllegalArgumentException
- if source0
is null
.IllegalArgumentException
- if constants
is null
.JAI
,
ParameterBlockJAI
,
RenderableOp
|
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