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Posted By

adrianparr on 02/09/11


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Value colour color convert RGB as3 hsb saturation hue


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jazzy_miles


AS3 RGB Colours (object) to HSB Colours (Object)

 / Published in: ActionScript 3
 
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  1. var darkGreenRgbObj:Object = new Object();
  2. darkGreenRgbObj.r = 51;
  3. darkGreenRgbObj.g = 102;
  4. darkGreenRgbObj.b = 0;
  5. var darkGreenHsbObj:Object = RGBtoHSB(darkGreenRgbObj.r, darkGreenRgbObj.g, darkGreenRgbObj.b);
  6. trace("RGB: " + darkGreenRgbObj.r + ", " + darkGreenRgbObj.g + ", " + darkGreenRgbObj.b);
  7. trace("HSB: " + darkGreenHsbObj.h + ", " + darkGreenHsbObj.s + ", " + darkGreenHsbObj.b);
  8.  
  9. function RGBtoHSB(r:int, g:int, b:int):Object
  10. {
  11. 	var hsb:Object = new Object;
  12. 	var _max:Number = Math.max(r,g,b);
  13. 	var _min:Number = Math.min(r,g,b);
  14.  
  15. 	hsb.s = (_max != 0) ? (_max - _min) / _max * 100: 0;
  16. 	hsb.b = _max / 255 * 100;
  17.  
  18. 	if(hsb.s == 0){
  19. 		hsb.h = 0;
  20. 	}else{
  21. 		switch(_max)
  22. 		{
  23. 			case r:
  24. 				hsb.h = (g - b)/(_max - _min)*60 + 0;
  25. 				break;
  26. 			case g:
  27. 				hsb.h = (b - r)/(_max - _min)*60 + 120;
  28. 				break;
  29. 			case b:
  30. 				hsb.h = (r - g)/(_max - _min)*60 + 240;
  31. 				break;
  32. 		}
  33. 	}
  34.  
  35. 	hsb.h = Math.min(360, Math.max(0, Math.round(hsb.h)))
  36. 	hsb.s = Math.min(100, Math.max(0, Math.round(hsb.s)))
  37. 	hsb.b = Math.min(100, Math.max(0, Math.round(hsb.b)))
  38.  
  39. 	return hsb;
  40. }
  41.  
  42. // OUTPUT
  43. // RGB: 51, 102, 0
  44. // HSB: 90, 100, 40

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Posted By: forchid on January 15, 2012

It's a great series of conversions functions that you put up. However in this one, I was experiencing some inconsistency when translating max red into the correlating hue.

I added one line, which seems to have helped to get the proper output for H:

case r: hsb.h = (g - b)/(_max - _min)*60 + 0; if (hsb.h < 0) hsb.h = 360 + hsb.h; // <--- added this break;

Posted By: forchid on January 15, 2012

Bah, that comment formatting didn't seem to work properly, so it looks confusing. This is the line:

if (hsb.h < 0) hsb.h = 360 + hsb.h;

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