XnView Software

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 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>255) R=255;
  if (G>255) G=255;
  if (B>255) B=255;
  
  Color rgb = new Color(R,G,B);
  return rgb;
 }