[转]各种颜色相互转换算法的C语言源代码

  1 //RGB to CMYk
  2 int* rgb2cmyk(int R,int G,int B)
  3 {
  4 int cmyk [4];
  5 
  6 cmyk[3]=(int)(min(min(255-R,255-G),255-B)/2.55);//cmykK
  7 int MyR = (int)(R/2.55);
  8 int Div = 100-cmyk[3];
  9 if (Div == 0)Div = 1;
 10 cmyk[0] = ((100-MyR-cmyk[3])/Div)*100;//cmykC
 11 int MyG = (int)(G/2.55);
 12 cmyk[1] = ((100-MyG-cmyk[3])/Div)*100;
 13 int MyB = (int)(B/2.55);
 14 cmyk[2] = ((100-MyB-cmyk[3])/Div)*100;
 15 
 16 return cmyk;
 17 }
 18 
 19 
 20 //CMYK to RGB
 21 int* cmyk2rgb(int C,int M,int Y,int K)
 22 {
 23 int rgb[3];
 24 int *R=&rgb[0];
 25 int *G=&rgb[1];
 26 int *B=&rgb[2];
 27 
 28 float MyC = C/100;
 29 float MyM = M/100;
 30 float MyY = Y/100;
 31 float MyK = K/100;
 32 
 33 int *R = (int)((1-(MyC*(1-MyK)+MyK))*255);
 34 int *G = (int)((1-(MyM*(1-MyK)+MyK))*255);
 35 int *B = (int)((1-(MyY*(1-MyK)+MyK))*255);
 36 
 37 if (*R<0) *R=0;
 38 if (*G<0) *G=0;
 39 if (*B<0) *B=0;
 40 if (*R>255) *R=255;
 41 if (*G>255) *G=255;
 42 if (*B>255) *B=255;
 43 
 44 return rgb;
 45 }
 46 
 47 
 48 //RGB to YUV 
 49 int* rgb2yuv(int R,int G,int B)
 50 {
 51 int yuv[3];
 52 
 53 yuv[0] = (int)(0.299*R+0.587*G+0.114*B);
 54 yuv[1] = (int)(-0.147*R-0.289*G+0.437*B);
 55 yuv[2] = (int)(0.615*R-0.515*G-0.1*B);
 56 
 57 return yuv;
 58 }
 59 
 60 
 61 //YUV to RGB 
 62 int* yuv2rgb(int y,int u,int v)
 63 {
 64 int rgb[3];
 65 int *R=&rgb[0];
 66 int *G=&rgb[1];
 67 int *B=&rgb[2];
 68     
 69 *R = (int)(y+1.14*v);
 70 *G = (int)(y-0.394*u-0.581*v);
 71 *B = (int)(y+2.028*u);
 72 
 73 if (*R<0) *R=0;
 74 if (*G<0) *G=0;
 75 if (*B<0) *B=0;
 76 if (*R>255) *R=255;
 77 if (*G>255) *G=255;
 78 if (*B>255) *B=255;
 79 
 80 return rgb;
 81 }
 82 
 83 
 84 //RGB to YIQ
 85 int* rgb2yiq(int R,int G,int B)
 86 {
 87 int yiq[3];
 88 
 89 yiq[0] = (int)(0.299*R+0.587*G+0.114*B);
 90 yiq[1] = (int)(0.596*R-0.274*G-0.322*B);
 91 yiq[2] = (int)(0.212*R-0.523*G+0.311*B);
 92 
 93 return yiq;
 94 }
 95 
 96 
 97 //YIQ to RGB
 98 int* yiq2rgb(float y,float i,float q)
 99 {
100 int rgb[3];
101 int *R=&rgb[0];
102 int *G=&rgb[1];
103 int *B=&rgb[2];
104 
105 *R = (int)(y+0.956*i+0.621*q);
106 *G = (int)(y-0.272*i-0.647*q);
107 *B = (int)(y-1.105*i+1.702*q);
108 
109 if (*R<0) *R=0;
110 if (*G<0) *G=0;
111 if (*B<0) *B=0;
112 if (*R>255) *R=255;
113 if (*G>255) *G=255;
114 if (*B>255) *B=255;
115 
116 return rgb;
117 }
118 
119 //RGB to YCbCr
120 int* rgb2ycbcr(int R, int G,int B)
121 {
122 int ycbcr[3];
123 
124 ycbcr[0] = (int)(0.299*R+0.587*G+0.114*B);
125 
126 ycbcr[1] = (int)(-0.1687*R-0.3313*G+0.5*B+128); 
127 if (ycbcr[1] > 255) ycbcr[1] = 255;
128 
129 ycbcr[2] = (int)(0.5*R-0.4187*G-0.0813*B+128);
130 if (ycbcr[2] > 255) ycbcr[2] = 255;
131 
132 return ycbcr;
133 }
134 
135 
136 //YCbCr to RGB
137 int* ycbcr2rgb(int Y,int Cb,int Cr)
138 {
139 int rgb[3];
140 int *R=&rgb[0];
141 int *G=&rgb[1];
142 int *B=&rgb[2];
143 
144 *R = (int)(Y + 1.402 * (Cr -128));
145 *G = (int)(Y - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128));
146 *B = (int)(Y + 1.772 * (Cb -128));
147 
148 if (*R > 255) *R = 255;
149 if (*G > 255) *G = 255;
150 if (*B > 255) *B = 255;
151 
152 if (*R <0) *R =0;
153 if (*G <0) *G =0;
154 if (*B <0) *B =0;
155 
156 return rgb;
157 }