Re: [boost] Interest in color library.

From: Andy Little (andy_at_[hidden])
Date: 2005-09-25 09:42:02

"Adam Badura" <abadura_at_[hidden]> wrote in message
news:dgbkob$ssq$1_at_sea.gmane.org...
>    Upsss...
>    I pressed "send" to fast... :)
>
>    I am gathering materials and working on a library (originaly I wanted
> one class, but it seems now that it wont be that easy) dealing with colors,
> their representation (like ranges 0.0-1.0 and 0-255), models (like RGB, YUV,
> HSV and others). Any sugestions or needs?

FWIW In programming I have only ever used the RGB ones. color<T>(T r,T g, T b); 
where T is float or int8, int16,int32 etc. I believe these are in use in eg 
VRML, HTML/CSS, SVG, XWindows etc..
I know that in VRML the transparency attribute in (RGBA) is used but in some 
cases  is separate from the RGB information (e.g Material node), so it might be 
worth keeping the distinction between a color and a colour with transparency. As 
far as the other color types go... Can they be converted to or from RGB  / RGBA 
without loss of information?. (I think most of them can). If so then obviously 
they are equivalent., however my inclination would be to concentrate on the RGB 
types rather than the others because of their wide use in the above 
standards/specifications. (unless you can find compelling evidence for similar 
use of  any of the others mentioned in langauge specifications, though I suspect 
that they are more hardware than software oriented) FWIW  Some interesting 
information regarding color at :

http://www.iec.ch/zone/colourmgmt/cm_entry.htm

regards
Andy Little