Re: [Lcms-user] Lab->Lab spac conversion?

[Kai-Uwe B. <ku...@gm...>]

Am 25.05.05, 10:04 +0200 schrieb Marti:

> 
> The problem is, lcms cannot guess which direction to use.
> 
> Let's imagine you have a input profile from RGB to Lab, and then you connect
> the colorspace profile after that, finally you have an output profile
> implementing Lab ->RGB 
> Which direction to use? 

Thanks for this explanation.
 
> Is for that reason Lab->Lab profiles are usually marked as
> abstract profiles. Those have only one direction. Just to
> prevent such kind of things.

The profile should be usable as working space. Abstracts are no option.

> Also, If I recall correctly, Lindbloom's profile deals with
> a tweaked Lab, so I wonder if the profile should be tagged as using Lab at
> all. That's not the Lab space all we are used.

Well, that [L]*ab is somewhat rotated. Calling it internally RGB should be 
ok.

thanks
Kai-Uwe Behrmann
                                + development for color management 
                                + imaging / panoramas
                                + email: ku...@gm...
                                + http://www.behrmann.name