first cs depend case: brighness,contrast

[Casper Boemann]

On Tuesday 07 June 2005 10:14, Boudewijn Rempt wrote:
> > Personally I think that say brighness filter should produce the exact
> > same visual effect in every colorspace.
> > doing:
> > RGB >> change brightness+5
> > should equal exactly (except for rounding errors)
> > RGB >> CMYK >> change brightness+5 >> RGB
> >
> > If it is even possible without taking profiles into consideration is
> > questionable, but something to strive for I think.
>
> Well, I think it'll be difficult.
Yes, it probably will.
So we'll strive for the most "correct" result, but not nessesarily the exact 
same as in other colorspaces

> Casper -- are you reading the lcms 
> mailing list? With the kind of work you're embarking upon now it could be
> useful.
No I'm not, but you're right. I think I'll subscribe tonight.

> Many problems have already been solved, or can be solved using the 
> more esoteric lcms functions, like:
<snip>
> Which to me reads as if lcms has methods to change curves in a colorspace
> independent fashio already. For the Krita colorspaces that are represented
> in lcms, we should strive to use these functions.
indeed

-- 
best regards / venlig hilsen
Casper Boemann