Java图像处理技巧四则(2)

中华网科技 http://tech.china.com 2005-07-19 13:50:31

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public GrayModel(ColorModel sourceModel) {
super(sourceModel.getPixelSize());
this.sourceModel=sourceModel;
modelStyle=0;
}
public GrayModel(ColorModel sourceModel,int style) {
super(sourceModel.getPixelSize());
this.sourceModel=sourceModel;
modelStyle=style;
}
public void setGrayStyle(int style) {
modelStyle=style;
}
protected int getGrayLevel(int pixel) {
if (modelStyle==CS_MAX) {
return Math.max(sourceModel.getRed(pixel),Math.max(sourceModel.getGreen(pixel),sourceModel.getBlue(pixel)));
}
else if (modelStyle==CS_FLOAT){
return (int)(sourceModel.getRed(pixel)*0.3+sourceModel.getGreen(pixel)*0.59+sourceModel.getBlue(pixel)*0.11);
}
else {
return 0;
}
}
public int getAlpha(int pixel) {
return sourceModel.getAlpha(pixel);
}
public int getRed(int pixel) {
return getGrayLevel(pixel);
}
public int getGreen(int pixel) {
return getGrayLevel(pixel);
}
public int getBlue(int pixel) {
return getGrayLevel(pixel);
}
public int getRGB(int pixel) {
int gray=getGrayLevel(pixel);
return (getAlpha(pixel)<<24)+(gray<<16)+(gray<<8)+gray;
}
}

　　如果你有自己的算法或者想取得特殊的效果，你可以修改类GrayModel的方法getGrayLevel()。

色彩变换

　　根据上面的原理，我们也可以实现色彩变换，这样的效果就很多了。下面是一个反转变换的例子：
/* ReverseColorModel.java*/
/*@author:cherami */
/*email:cherami@163.net*/
import java.awt.image.*;

public class ReverseColorModel extends ColorModel {
ColorModel sourceModel;
public ReverseColorModel(ColorModel sourceModel) {
super(sourceModel.getPixelSize());
this.sourceModel=sourceModel;
}
public int getAlpha(int pixel) {
return sourceModel.getAlpha(pixel);
}
public int getRed(int pixel) {
return ~sourceModel.getRed(pixel);
}
public int getGreen(int pixel) {
return ~sourceModel.getGreen(pixel);
}
public int getBlue(int pixel) {
return ~sourceModel.getBlue(pixel);
}
public int getRGB(int pixel) {
return (getAlpha(pixel)<<24)+(getRed(pixel)<<16)+(getGreen(pixel)<<8)+getBlue(pixel);
}
}
/* ReverseColorModel.java*/
/*@author:cherami */
/*email:cherami@163.net*/

import java.awt.image.*;

public class ReverseFilter extends RGBImageFilter {
public ReverseFilter() {
canFilterIndexColorModel=true;
}
public void setColorModel(ColorModel cm) {
substituteColorModel(cm,new ReverseColorModel(cm));
}

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