实现RGB,CMY(K),YUV,YIQ,YCbCr颜色的转换算法

源：http://blog.sina.com.cn/s/blog_4d80055a01000atu.html

import java.lang.Math;
import java.awt.*;

public class ColorConverter{

 public ColorConverter(){
 }

 //RGB转换CMYk
 public int[] rgb2cmyk(int R,int G,int B){
  int cmyk []= new int[4];
  cmyk[3]=(int)(Math.min(Math.min(255-R,255-G),255-B)/2.55);//cmykK
  int MyR = (int)(R/2.55);
  int Div = 100-cmyk[3];
  if (Div == 0)Div = 1;
  cmyk[0] = ((100-MyR-cmyk[3])/Div)*100;//cmykC
  int MyG = (int)(G/2.55);
  cmyk[1] = ((100-MyG-cmyk[3])/Div)*100;
  int MyB = (int)(B/2.55);
  cmyk[2] = ((100-MyB-cmyk[3])/Div)*100;

  return cmyk;
 }
 public Color cmyk2rgb(int C,int M,int Y,int K){
  float MyC = C/100;
  float MyM = M/100;
  float MyY = Y/100;
  float MyK = K/100;

  int R = (int)((1-(MyC*(1-MyK)+MyK))*255);
  int G = (int)((1-(MyM*(1-MyK)+MyK))*255);
  int B = (int)((1-(MyY*(1-MyK)+MyK))*255);

  if (R<0) R=0;
  if (G<0) G=0;
  if (B<0) B=0;
  if (R>255) R=255;
  if (G>255) G=255;
  if (B>255) B=255;

  Color rgb = new Color(R,G,B);
  return rgb;
 }

 public int[] rgb2yuv(int R,int G,int B){

  int yuv[] = new int[3];
  yuv[0] =(int)(0.299*R+0.587*G+0.114*B);
  yuv[1] = (int)(-0.147*R-0.289*G+0.437*B);
  yuv[2] = (int)(0.615*R-0.515*G-0.1*B);
  return yuv;
 }
 public Color yuv2rgb(int y,int u,int v){

  int R = (int)(y+1.14*v);
  int G = (int)(y-0.394*u-0.581*v);
  int B = (int)(y+2.028*u);
  if (R<0) R=0;
  if (G<0) G=0;
  if (B<0) B=0;
  if (R>255) R=255;
  if (G>255) G=255;
  if (B>255) B=255;

  Color rgb=new Color(R,G,B);
  return rgb;
 }
 public int[] rgb2yiq(int R,int G,int B){

  int yiq[] = new int[3];
  yiq[0] = (int)(0.299*R+0.587*G+0.114*B);
  yiq[1] = (int)(0.596*R-0.274*G-0.322*B);
  yiq[2] = (int)(0.212*R-0.523*G+0.311*B);
  return yiq;
 }
 public Color yiq2rgb(float y,float i,float q){

  int R = (int)(y+0.956*i+0.621*q);
  int G = (int)(y-0.272*i-0.647*q);
  int B = (int)(y-1.105*i+1.702*q);

  if (R<0) R=0;
  if (G<0) G=0;
  if (B<0) B=0;
  if (R>255) R=255;
  if (G>255) G=255;
  if (B>255) B=255;

  Color rgb = new Color(R,G,B);
  return rgb;
 }

 //RGB转换YCbCr
 public int[] rgb2ycbcr(int R, int G,int B){

  int ycbcr[] = new int[3];
  ycbcr[0] = (int)(0.299*R+0.587*G+0.114*B);
  ycbcr[1] = (int)(-0.1687*R-0.3313*G+0.5*B+128);
  if (ycbcr[1] > 255) ycbcr[1] = 255;
  ycbcr[2] = (int)(0.5*R-0.4187*G-0.0813*B+128);
  if (ycbcr[2] > 255) ycbcr[2] = 255;

  return ycbcr;
 }
 public Color ycbcr2rgb(int Y,int Cb,int Cr){
  int MyR = (int)(Y + 1.402 * (Cr -128));
  int MyG = (int)(Y - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128));
  int MyB = (int)(Y + 1.772 * (Cb -128));

  if (MyR > 255) MyR = 255;
  if (MyG > 255) MyG = 255;
  if (MyB > 255) MyB = 255;

  if (MyR < 0) MyR =0;
  if (MyG < 0) MyG =0;
  if (MyB < 0) MyB =0;

  Color rgb = new Color(MyR,MyG,MyB);
  return rgb;
 }
}