# Transform colors. Help please

**URL:** <https://forum.kirupa.com/t/transform-colors-help-please/63140>\
**Category:** flash\
**Created:** [September 3, 2004, 7:44am UTC](https://forum.kirupa.com/t/transform-colors-help-please/63140 "2004-09-03T07:44:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mx\_guest2004](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@mx\_guest2004](https://forum.kirupa.com/u/mx_guest2004)\
**Post date:** [September 3, 2004, 7:44am UTC](https://forum.kirupa.com/t/transform-colors-help-please/63140/1 "2004-09-03T07:44:58Z")

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Hi,  
Does anybody here know how to calculate different parameters :  
ra, rb, ga,gb, ba, bb, aa,ab when transforming from one color to another ?  
Example: I want to change from #FFFF00 to #993300  
according to photoshop the RGB for #993300 is R=153, G=51 and B=0  
What is the right method to calculate these parameters?

Thanks 🙂  
mx-guest2004