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RGB/CMYK Conversion

/ Published in: C++
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  1. void RGBtoCMYK(float color[4])
  2. {
  3. 	if (color[0]==0 && color[1]==0 && color[2]==0)
  4. 	{
  5. 		color[0] = 0;
  6. 		color[1] = 0;
  7. 		color[2] = 0;
  8. 		color[3] = 1.0;
  9. 	}
  10. 	else if (color[0]==1.0 && color[1]==1.0 && color[2]==1.0)
  11. 	{
  12. 		color[0] = 0;
  13. 		color[1] = 0;
  14. 		color[2] = 0;
  15. 		color[3] = 0;
  16. 	}
  17. 	else
  18. 	{
  19. 		color[0] = 1.0 - color[0];
  20. 		color[1] = 1.0 - color[1];
  21. 		color[2] = 1.0 - color[2];
  22.  
  23. 		float minK = MIN(color[0], MIN(color[1], color[2]));
  24. 		color[0] = (color[0] - minK) / (1.0 - minK);
  25. 		color[1] = (color[1] - minK) / (1.0 - minK);
  26. 		color[2] = (color[2] - minK) / (1.0 - minK);
  27. 		color[3] = minK;
  28. 	}
  29. }
  30.  
  31. void CMYKtoRGB(float color[4])
  32. {
  33. 	color[0] = 1.0 - (color[0] * (1.0 - color[3]) + color[3]);
  34. 	color[1] = 1.0 - (color[1] * (1.0 - color[3]) + color[3]);
  35. 	color[2] = 1.0 - (color[2] * (1.0 - color[3]) + color[3]);
  36. 	color[3] = 1.0;
  37. }

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