Hi,
the XYZ-Lab conversion is done automatically. If you experience 
mismatches, that may be due to bugs in the CMM.
Check photoshop or the ICC reference implementation to see who is buggy.

Regards
Marti

Pascal de Bruijn wrote:
> Hi,
>
> I have a generic question regarding color profiles and icc:
>
> I made a display profile using Argyll which (with iccdump) gives me
> this (this is true for sRGB as well):
>
> Display profile
>  Color Space  = RGB
>  Conn. Space  = XYZ
>
> However, I have other profiles (Canon EOS 400D) which report the
> following with iccdump:
>
> Camera profile
>  Color Space  = RGB
>  Conn. Space  = Lab
>
> I'm curious as how does LCMS respond to such a mismatch? Is an automatic
> XYZ-Lab conversion done? Or will it render invalid/incorrect/deviant results?
>
> Is it possible to convert the RGB-Lab profile to a RGB-XYZ profile?
>
> The reason why I'm asking this, is that I've been having trouble
> reproducing the
> same colors in comparison to the original Canon software. Even though I'm
> using the same source file, and the same color profile.
>
> Regards,
> Pascal de Bruijn
>
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