程序包 org.meteoinfo.image.filter

类 QuantizeFilter

java.lang.Object

org.meteoinfo.image.filter.AbstractBufferedImageOp

org.meteoinfo.image.filter.WholeImageFilter

org.meteoinfo.image.filter.QuantizeFilter

所有已实现的接口:

BufferedImageOp, Cloneable

public class QuantizeFilter
extends WholeImageFilter

A filter which quantizes an image to a set number of colors - useful for producing images which are to be encoded using an index color model. The filter can perform Floyd-Steinberg error-diffusion dithering if required. At present, the quantization is done using an octtree algorithm but I eventually hope to add more quantization methods such as median cut. Note: at present, the filter produces an image which uses the RGB color model (because the application it was written for required it). I hope to extend it to produce an IndexColorModel by request.

字段概要

字段

限定符和类型	字段	说明
protected static int[]	matrix	Floyd-Steinberg dithering matrix.

从类继承的字段 org.meteoinfo.image.filter.WholeImageFilter

originalSpace, transformedSpace

构造器概要

构造器

构造器	说明
QuantizeFilter()

方法概要

限定符和类型	方法	说明
protected int[]	filterPixels(int width, int height, int[] inPixels, Rectangle transformedSpace)	Actually filter the pixels.
boolean	getDither()	Return the dithering setting
int	getNumColors()	Get the number of colors to quantize to.
boolean	getSerpentine()	Return the serpentine setting
void	quantize(int[] inPixels, int[] outPixels, int width, int height, int numColors, boolean dither, boolean serpentine)
void	setDither(boolean dither)	Set whether to use dithering or not.
void	setNumColors(int numColors)	Set the number of colors to quantize to.
void	setSerpentine(boolean serpentine)	Set whether to use a serpentine pattern for return or not.
String	toString()

从类继承的方法 org.meteoinfo.image.filter.AbstractBufferedImageOp

clone, createCompatibleDestImage, getBounds2D, getPoint2D, getRenderingHints, getRGB, setRGB

从类继承的方法 java.lang.Object

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

从类继承的方法 org.meteoinfo.image.filter.WholeImageFilter

filter, transformSpace

字段详细资料

matrix

protected static final int[] matrix

Floyd-Steinberg dithering matrix.

构造器详细资料

QuantizeFilter

public QuantizeFilter()

方法详细资料

setNumColors

public void setNumColors(int numColors)

Set the number of colors to quantize to.

参数:

numColors - the number of colors. The default is 256.

getNumColors

public int getNumColors()

Get the number of colors to quantize to.

返回:

the number of colors.

setDither

public void setDither(boolean dither)

Set whether to use dithering or not. If not, the image is posterized.

参数:

dither - true to use dithering

getDither

public boolean getDither()

Return the dithering setting

返回:

the current setting

setSerpentine

public void setSerpentine(boolean serpentine)

Set whether to use a serpentine pattern for return or not. This can reduce 'avalanche' artifacts in the output.

参数:

serpentine - true to use serpentine pattern

getSerpentine

public boolean getSerpentine()

Return the serpentine setting

返回:

the current setting

quantize

public void quantize(int[] inPixels,
                     int[] outPixels,
                     int width,
                     int height,
                     int numColors,
                     boolean dither,
                     boolean serpentine)

filterPixels

protected int[] filterPixels(int width,
                             int height,
                             int[] inPixels,
                             Rectangle transformedSpace)

从类复制的说明: WholeImageFilter

Actually filter the pixels.

指定者:

filterPixels 在类中 WholeImageFilter

参数:

width - the image width

height - the image height

inPixels - the image pixels

transformedSpace - the output bounds

返回:

the output pixels

toString

public String toString()

覆盖:

toString 在类中 Object