Re: Creating Lab image files from Lab data files
Re: Creating Lab image files from Lab data files
- Subject: Re: Creating Lab image files from Lab data files
- From: ignacio ruiz de conejo <email@hidden>
- Date: Thu, 30 Jun 2005 13:32:55 +0200
Bruce, Marco:
There's a bug in the current versions of ColorLab that causes Lab
TIFFs generated from data files to be screwed up in an interesting
way. On both the a* and b* channels, the sign is reversed, and the
values from 0 to 128 are flipped.
I suspect that someone much more skilled in Excel than I am could
write a formula that would munge the Lab data in such a way that the
TIFFs came out right. I'm sufficiently math-challenged that it made
my head hurt thinking about it.
When I found this bug, and after talking to GMB's Patrick Herzog, I
wrote a little C
program to generate TIFF images out of an IT8/CGATS formatted file.
Actually, it was an extension, for it was already generating RGB and
CMYK images.
All it requires is linking with tifflib and lcms libraries.
If anybody is interested, I could send it (source and executable) to
Bruce/Chris for
them to include it in their download page.
Regards,
Ignacio
--
______________________________________________________________
Ignacio Ruiz de Conejo Tel. +34 93.5821342
Color & Imaging Group, R&D Fax +34 93.5824816
Hewlett-Packard EspaƱola, ICD e-mail: email@hidden
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