Package com.jme3.post.filters

Class ContrastAdjustmentFilter

java.lang.Object

com.jme3.post.Filter

com.jme3.post.filters.ContrastAdjustmentFilter

All Implemented Interfaces:

Savable

public class ContrastAdjustmentFilter
extends Filter

A filter to adjust the colors of a rendered scene by normalizing each color channel to a specified range, applying a power law, and scaling the output. The alpha channel is unaffected.

Nested Class Summary

Nested classes/interfaces inherited from class com.jme3.post.Filter

Filter.Pass

Field Summary

Fields inherited from class com.jme3.post.Filter

defaultPass, enabled, material, postRenderPasses, processor

Constructor Summary

Constructors

Constructor	Description
ContrastAdjustmentFilter()	Instantiates a contrast-adjustment filter with the default parameters:
ContrastAdjustmentFilter(float exponent)	Instantiates a contrast-adjustment filter with the default input range and output scaling.

Method Summary

Modifier and Type	Method	Description
float	getBlueExponent()	Retrieves the blue-channel exponent.
float	getBlueScale()	Retrieves the output scale factor for the blue channel.
float	getGreenExponent()	Retrieves the green-channel exponent.
float	getGreenScale()	Retrieves the output scale factor for the green channel.
float	getLowerLimit()	Returns the lower limit of the input range.
protected Material	getMaterial()	Returns the Material used in this Filter.
float	getRedExponent()	Retrieves the red-channel exponent.
float	getRedScale()	Retrieves the output scale factor for the red channel.
float	getUpperLimit()	Returns the upper limit of the input range.
protected void	initFilter(AssetManager assetManager, RenderManager renderManager, ViewPort viewPort, int width, int height)	Initializes the Filter when it is added to a FilterPostProcessor.
void	read(JmeImporter im)	De-serializes this filter, for example when loading from a J3O file.
ContrastAdjustmentFilter	setBlueExponent(float exponent)	Sets the power-law exponent for the blue channel.
ContrastAdjustmentFilter	setBlueScale(float factor)	Sets the output scale factor for the blue channel.
ContrastAdjustmentFilter	setExponents(float redExponent, float greenExponent, float blueExponent)	Sets the power-law exponent for each color channel.
ContrastAdjustmentFilter	setGreenExponent(float exponent)	Sets the power-law exponent for the green channel.
ContrastAdjustmentFilter	setGreenScale(float factor)	Sets the output scale factor for the green channel.
ContrastAdjustmentFilter	setInputRange(float lowerLimit, float upperLimit)	Sets the input range for each color channel.
ContrastAdjustmentFilter	setLowerLimit(float level)	Sets the lower limit of the input range.
ContrastAdjustmentFilter	setRedExponent(float exponent)	Sets the power-law exponent for the red channel.
ContrastAdjustmentFilter	setRedScale(float factor)	Sets the output scale factor for the red channel.
ContrastAdjustmentFilter	setScales(float redScale, float greenScale, float blueScale)	Adjusts the output scaling for each color channel.
ContrastAdjustmentFilter	setUpperLimit(float level)	Sets the upper limit of the input range.
String	toString()	Represent this Filter as a String.
void	write(JmeExporter ex)	Serializes this filter, for example when saving to a J3O file.

Methods inherited from class com.jme3.post.Filter

cleanup, cleanUpFilter, getDefaultPassDepthFormat, getDefaultPassTextureFormat, getName, getPostRenderPasses, getRenderedTexture, getRenderFrameBuffer, init, isEnabled, isRequiresBilinear, isRequiresDepthTexture, isRequiresSceneTexture, postFilter, postFrame, postQueue, preFrame, setDepthTexture, setEnabled, setName, setProcessor, setRenderedTexture, setRenderFrameBuffer

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

ContrastAdjustmentFilter

public ContrastAdjustmentFilter()

Instantiates a contrast-adjustment filter with the default parameters:

input range from 0 to 1

power-law exponent=1 for all color channels

output scale factor=1 for all color channels Such a filter has no effect.

ContrastAdjustmentFilter

public ContrastAdjustmentFilter(float exponent)

Instantiates a contrast-adjustment filter with the default input range and output scaling.

Parameters:

exponent - the desired power-law exponent for all color channels

Method Details

setExponents

public ContrastAdjustmentFilter setExponents(float redExponent,
 float greenExponent,
 float blueExponent)

Sets the power-law exponent for each color channel. The default value for each exponent is 1, which produces a linear filter.

Parameters:

redExponent - the desired red-channel exponent

greenExponent - the desired green-channel exponent

blueExponent - the desired blue-channel exponent

Returns:

this filter instance, for chaining

setRedExponent

public ContrastAdjustmentFilter setRedExponent(float exponent)

Sets the power-law exponent for the red channel.

Parameters:

exponent - the desired exponent (default=1 for linear)

Returns:

this filter instance, for chaining

setGreenExponent

public ContrastAdjustmentFilter setGreenExponent(float exponent)

Sets the power-law exponent for the green channel.

Parameters:

exponent - the desired exponent (default=1 for linear)

Returns:

this filter instance, for chaining

setBlueExponent

public ContrastAdjustmentFilter setBlueExponent(float exponent)

Sets the power-law exponent for the blue channel.

Parameters:

exponent - the desired exponent (default=1 for linear)

Returns:

this filter instance, for chaining

getRedExponent

public float getRedExponent()

Retrieves the red-channel exponent.

Returns:

the power-law exponent (default=1 for linear)

getGreenExponent

public float getGreenExponent()

Retrieves the green-channel exponent.

Returns:

the power-law exponent (default=1 for linear)

getBlueExponent

public float getBlueExponent()

Retrieves the blue-channel exponent.

Returns:

the power-law exponent (default=1 for linear)

setInputRange

public ContrastAdjustmentFilter setInputRange(float lowerLimit,
 float upperLimit)

Sets the input range for each color channel.

Before applying the power law, the input levels get normalized: lowerLimit and below normalize to 0 and upperLimit normalizes to 1.

Parameters:

lowerLimit - the desired lower limit (default=0)

upperLimit - the desired upper limit (default=1)

Returns:

this filter instance, for chaining

setUpperLimit

public ContrastAdjustmentFilter setUpperLimit(float level)

Sets the upper limit of the input range.

Parameters:

level - the input level that should be normalized to 1 (default=1)

Returns:

this filter instance, for chaining

setLowerLimit

public ContrastAdjustmentFilter setLowerLimit(float level)

Sets the lower limit of the input range.

Parameters:

level - the highest input level that should be normalized to 0 (default=0)

Returns:

this filter instance, for chaining

getLowerLimit

public float getLowerLimit()

Returns the lower limit of the input range.

Returns:

the input level (default=0)

getUpperLimit

public float getUpperLimit()

Returns the upper limit of the input range.

Returns:

the input level (default=1)

setScales

public ContrastAdjustmentFilter setScales(float redScale,
 float greenScale,
 float blueScale)

Adjusts the output scaling for each color channel. The default for each scale factor is 1, which has no effect.

Parameters:

redScale - the red-channel scale factor

greenScale - the green-channel scale factor

blueScale - the blue-channel scale factor

Returns:

this filter instance, for chaining

setRedScale

public ContrastAdjustmentFilter setRedScale(float factor)

Sets the output scale factor for the red channel.

Parameters:

factor - the desired scale factor (default=1)

Returns:

this filter instance, for chaining

setGreenScale

public ContrastAdjustmentFilter setGreenScale(float factor)

Sets the output scale factor for the green channel.

Parameters:

factor - the desired scale factor (default=1)

Returns:

this filter instance, for chaining

setBlueScale

public ContrastAdjustmentFilter setBlueScale(float factor)

Sets the output scale factor for the blue channel.

Parameters:

factor - the desired scale factor (default=1)

Returns:

this filter instance, for chaining

getRedScale

public float getRedScale()

Retrieves the output scale factor for the red channel.

Returns:

the scale factor (default=1 for no effect)

getGreenScale

public float getGreenScale()

Retrieves the output scale factor for the green channel.

Returns:

the scale factor (default=1 for no effect)

getBlueScale

public float getBlueScale()

Retrieves the output scale factor for the blue channel.

Returns:

the scale factor (default=1 for no effect)

initFilter

protected void initFilter(AssetManager assetManager,
 RenderManager renderManager,
 ViewPort viewPort,
 int width,
 int height)

Initializes the Filter when it is added to a FilterPostProcessor.

Specified by:

initFilter in class Filter

Parameters:

assetManager - for loading assets (not null)

renderManager - unused

viewPort - unused

width - unused

height - unused

getMaterial

protected Material getMaterial()

Returns the Material used in this Filter. This method is invoked on every frame.

Specified by:

getMaterial in class Filter

Returns:

the pre-existing instance, or null if the Filter hasn't been initialized

read

public void read(JmeImporter im)
          throws IOException

De-serializes this filter, for example when loading from a J3O file.

Specified by:

read in interface Savable

Overrides:

read in class Filter

Parameters:

im - the importer to use (not null)

Throws:

IOException - from the importer

write

public void write(JmeExporter ex)
           throws IOException

Serializes this filter, for example when saving to a J3O file.

Specified by:

write in interface Savable

Overrides:

write in class Filter

Parameters:

ex - the exporter to use (not null)

Throws:

IOException - from the exporter

toString

public String toString()

Represent this Filter as a String.

Overrides:

toString in class Object

Returns:

a descriptive string of text (not null)