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java.lang.Object | +--javax.media.jai.OperationDescriptorImpl | +--javax.media.jai.operator.LogDescriptor
An OperationDescriptor
describing the "Log" operation.
The "Log" operation takes the natural logarithm of the pixel values of an image. The operation is done on a per-pixel, per-band basis. For integral data types, the result will be rounded and clamped as needed. The pixel values of the destination image are defined as:
dst[x][y][b] = java.lang.Math.log(src[x][y][b])
For all integral data types, the log of 0 is set to 0. For
signed integral data types (short
and int
),
the log of a negative pixel value is set to -1.
For all floating point data types ((float
and
double
), the log of 0 is set to -Infinity
,
and the log of a negative pixel value is set to NaN
.
Name | Value |
---|---|
GlobalName | Log |
LocalName | Log |
Vendor | com.sun.media.jai |
Description | Computes the natural logarithm of the pixel values of an image. |
DocURL | http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/LogDescriptor.html |
Version | 1.0 |
No parameters are needed for the "Log" operation.
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 | |
LogDescriptor()
Constructor. |
Method Summary | |
static RenderedOp |
create(RenderedImage source0,
RenderingHints hints)
Computes the natural logarithm of the pixel values of an image. |
static RenderableOp |
createRenderable(RenderableImage source0,
RenderingHints hints)
Computes the natural logarithm of the pixel values of an image. |
boolean |
isRenderableSupported()
Returns true since renderable operation is supported. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public LogDescriptor()
Method Detail |
public boolean isRenderableSupported()
true
since renderable operation is supported.isRenderableSupported
in class OperationDescriptorImpl
javax.media.jai.OperationDescriptorImpl
OperationDescriptorImpl.isModeSupported(java.lang.String)
public static RenderedOp create(RenderedImage source0, RenderingHints hints)
Creates a ParameterBlockJAI
from all
supplied arguments except hints
and invokes
JAI.create(String,ParameterBlock,RenderingHints)
.
source0
- RenderedImage
source 0.hints
- The RenderingHints
to use.
May be null
.RenderedOp
destination.IllegalArgumentException
- if source0
is null
.JAI
,
ParameterBlockJAI
,
RenderedOp
public static RenderableOp createRenderable(RenderableImage source0, RenderingHints hints)
Creates a ParameterBlockJAI
from all
supplied arguments except hints
and invokes
JAI.createRenderable(String,ParameterBlock,RenderingHints)
.
source0
- RenderableImage
source 0.hints
- The RenderingHints
to use.
May be null
.RenderableOp
destination.IllegalArgumentException
- if source0
is null
.JAI
,
ParameterBlockJAI
,
RenderableOp
|
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