[thelist] RGB, Hex and HSL

Joe Crawford jcrawford at avencom.com
Fri Jul 27 13:49:50 CDT 2001


Mutes wrote:
> Hello,
>     I wish to understand how RGB is translated into HSB for the development
> of a php script.
> All that I'm aware of HSB is that the angle for Hue is defined as an angle
> relative to pure red on the color wheel...
> So, if anybody could explain, it would be greatly appreciated :)
> 
> Thanks in advance

One of my great joys when I was first learning PhotoShop was reading all
the great colorspace FAQs and graphics file format FAQs which had come
from usenet. Amazing stuff. Anyway - what you seek are color algorithms.
Hopefully these will lead you in the right direction:

http://www.cs.rit.edu/~ncs/color/t_convert.html
http://www.inforamp.net/~poynton/Poynton-colour.html
http://groups.google.com/groups?hl=en&rnum=7&selm=graphics/colorspace-faq_996142223%40rtfm.mit.edu

Basically, you just have to learn what the math is.

HTH!
	Joe <http://artlung.com/>
-- 
...................  Joe Crawford \\ Web Design & Development
.....  mailto:jcrawford at avencom.com \\ http://www.avencom.com
.... San Diego \\ CA \\ USA \\ AVENCOM: Set Your Sites Higher




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