Re: On the use of wide-gamut RGB working spaces
Re: On the use of wide-gamut RGB working spaces
- Subject: Re: On the use of wide-gamut RGB working spaces
- From: Klaus Karcher <email@hidden>
- Date: Thu, 09 Oct 2008 13:52:32 +0200
Karsten Krüger wrote:
When moving an image to a smaller color space (like when printing to
offset) you want to keep details, so you choose to use a perceptual
rendering intend.
ProPhoto does not compress nicely when you go to ISOcoated (whichever
version) - lots of unused color space with a typical image, and the used
one gets very small due to the compression. So perceptual rendering is
not an option. You end up with relative colorimetric rendering intend,
clipping and manual image tweaking.
ISOcoated (in your example) couldn't care less about the input space --
and that's where the gamut mapping takes place. When you transform the
same (L*a*b*) colors it doesn't matter whether they com from sRGB,
prophoto or whatever -- the gamut compression and/or clipping will be
exactly the same (in conventional CM workflows).
This is one reason why image libraries choose eciRGB_v2 for archiveing -
eciRGB_v2 is big enaugh to cover all ISOcoated colors, but small enaugh
to keep most details with perceptual rendering
This argument is nonsense IMHO.
(the other advantage: it
uses L* from L*a*b* as neutral grey axis and is not prone to a gamma
curve like sRGB and AdobeRGB- which makes it easy for L*a*b* math to
keep grey neutral and evenly distributed).
acknowledged :-)
Klaus
--
Klaus Karcher * Eichenallee 18
26203 Wardenburg * Germany
Tel. +49 441 8859770
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