一：基本思想
做法非常简单，首先找到一张你想要的纹理素材图片，然后将该图片通过灰度
转换成一张灰度级别的纹理图，取得像素数据，扫描每个像素的灰度值来设置
纹理图像的每个像素的透明度。灰度值越高越接近白色的透明度越高，灰度
值越小的越接近黑色的透明度越小。然后利用Java 2D的TexturePaint来创建
纹理画笔，最终一步就是在目标图像上填充一个与它大小一致的纹理矩形。
如此便完成。
二：程序运行效果
纹理图：
目标图像：
http://
效果图：
源程序代码：
package com.gloomyfish.filter.study;import java.awt.Graphics2D;import java.awt.Rectangle;import java.awt.TexturePaint;import java.awt.geom.Rectangle2D;import java.awt.image.BufferedImage;public class TextureAdditionFilter extends AbstractBufferedImageOp {private BufferedImage textureImage;private float textureTransparency;public TextureAdditionFilter(){textureTransparency = 0.9f;System.out.println("Java texture Image Addition Filter");}public void setTextureImage(BufferedImage textureImage) {this.textureImage = textureImage;}public void setTextureTransparency(float textureTransparency) {this.textureTransparency = textureTransparency;}@Overridepublic BufferedImage filter(BufferedImage src, BufferedImage dest) {if(textureImage != null) {int width = textureImage.getWidth(); int height = textureImage.getHeight(); BufferedImage grayTextureImage = null; grayTextureImage = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR); int[] inPixels = new int[width*height]; int[] outPixels = new int[width*height]; getRGB( textureImage, 0, 0, width, height, inPixels ); int index = 0; for(int row=0; row<height; row++) { int ta = 0, tr = 0, tg = 0, tb = 0; for(int col=0; col<width; col++) { index = row * width + col; ta = (inPixels[index] >> 24) & 0xff; tr = (inPixels[index] >> 16) & 0xff; tg = (inPixels[index] >> 8) & 0xff; tb = inPixels[index] & 0xff; tr = tg = tb = (int)(0.299 * (double)tr + 0.587 * (double)tg + 0.114 * (double)tb); ta = (int)(textureTransparency * tr); outPixels[index] = (ta << 24) | (tr << 16) | (tg << 8) | tb; } } // then call java 2D API to print texture image on target image // you can see magic result image if you adjust the parameter-textureTransparency // just play with it...... setRGB( grayTextureImage, 0, 0, width, height, outPixels ); Rectangle2D rectangle = new Rectangle(0, 0, width, height); TexturePaint tp = new TexturePaint(grayTextureImage, rectangle); Graphics2D g2d = src.createGraphics(); g2d.setPaint(tp); width = src.getWidth(); height = src.getHeight(); g2d.fillRect(0, 0, width, height);}return src;}}
也就越容易失败，还不如怀揣一颗平常心，“但行好事，莫问前程”，往往成功的几率反而更大些
