图像像素基本操作——自然系列滤镜

主要代码如下：
package chapter5;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**

• Created by LENOVO on 18-1-30.
  */
  public class LvJingFilter extends AbstractBufferedImageOp {
  int[] fogLookUp = new int[257];//雾化风格颜色查找表
  int[] rainbowLookup ;
  public LvJingFilter(){

  }
  public BufferedImage filter(BufferedImage src,BufferedImage dest){
  int width = src.getWidth();
  int height = src.getHeight();
  if(dest == null){
  dest = creatCompatibleDestImage(src,null);
  }
  int inpixels[] = new int[widthheight];
  int outpixels[] = new int[widthheight];
  getRGB(src,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 = rowwidth+col;
  ta = (inpixels[index] >> 24) & 0xff;
  tr = (inpixels[index] >> 16) & 0xff;
  tg = (inpixels[index] >> 8) & 0xff;
  tb = (inpixels[index]);
  /空气风格
  tr = (tg+tb)/2;
  tg = (tr+tb)/2;
  tb = (tr+tg)/2;
  /
  /燃情风格
  int gray = (tr+tg+tb)/3;
  tr = clamp(gray3);
  tg = gray;
  tb = gray/3;
  /
  /冰冻风格
  tr = clamp((int) Math.abs((tr-tg-tb)1.5));
  tg = clamp((int) Math.abs((tg-tb-tr)1.5));
  tb = clamp((int) (Math.abs(tb-tr-tg)1.5));
  /
  /熔岩风格
  int gray = (tr+tg+tb)/3;
  tr = gray;
  tg = Math.abs(tb-128);
  tb = Math.abs(tb-128);
  /
  /金属风格
  float r = Math.abs(tr-64);
  float g = Math.abs(r-64);
  float b = Math.abs(g-64);
  float gray = ((222r + 707g + 71b)/1000);
  r = gray +70;
  r = r+(((r-128)100)/100f);
  g = gray+65;
  g = g+(((g-128)100)/100f);
  b = gray +75;
  b = b+(((b-128)100)/100f);
  tr = clamp((int) r);
  tg = clamp((int) g);
  tb = clamp((int) b);
  /
  /海洋风格
  int gray = (tr+tg +tb)/3;
  tr = clamp(gray/3);
  tg = gray;
  tb = clamp(gray*3);
  /
  /湖水风格
  int gray = (tr+tg+tb)/3;
  tr = clamp(gray-tg-tb);
  tg = clamp(gray-tr-tb);
  tb = clamp(gray-tr-tg);
  /
  /雾化风格
  buildFogLookupTable();
  tr = fogLookUp[clamp(tr)];
  tg = fogLookUp[clamp(tg)];
  tb = fogLookUp[clamp(tb)];
  */
  //基于特定图像给出的颜色作为标准来生成颜色查找表——本例为彩虹
  buildRainBowLookupTable();
  tr = rainbowLookup[clamp(tr)];
  tg = rainbowLookup[clamp(tg)];
  tb = rainbowLookup[clamp(tb)];
  outpixels[index] = (ta <<24 ) | (clamp(tr) <<16) | (clamp(tg) << 8) | clamp(tb);
  }
  }
  setRGB(dest,0,0,width,height,outpixels);

   return dest;
  

  }
  //雾风格颜色查找表//40,41,42,.....127,127,127,....127,128,129,...,255
  public void buildFogLookupTable(){
  //颜色查找表
  int fogLimit = 40;
  for(int i=0; i<fogLookUp.length;i++){
  if(i>127){
  fogLookUp[i] = i-fogLimit;
  if(fogLookUp[i]<127){
  fogLookUp[i] = 127;
  }
  }else{
  fogLookUp[i] = i+fogLimit;
  if(fogLookUp[i] > 127){
  fogLookUp[i] = 127;
  }
  }

   }
  

  }

  //彩虹风格颜色查找表
  public void buildRainBowLookupTable(){
  java.net.URL imageURL = this.getClass().getResource("rainbow.jpg");
  if(imageURL !=null){
  try {
  BufferedImage image = ImageIO.read(imageURL);
  int width = image.getWidth();
  int height = image.getHeight();
  rainbowLookup = new int[width];
  int[] inPixels = new int[width*height];
  getRGB(image,0,0,width,height,inPixels);
  for(int col=0;col<width;col++){
  rainbowLookup[col] = inPixels[col];
  }
  } catch (IOException e) {
  // e.printStackTrace();
  System.out.println("An error occured when loading the image icon...");
  }
  }

  }
  }
  测试代码同上