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: Karsten Krüger <email@hidden>
- Date: Thu, 9 Oct 2008 09:45:42 +0200
Am 09.10.2008 um 05:35 schrieb Marco Ugolini:
3. Use the smallest color space needed to encompass all the colors in
the original with a little room to spare--it makes editing easier.
Could you please provide a practical example that proves such an
advantage?
I'm open to being persuaded by convincing evidence. Perhaps you are
able to
spare an image or two that prove the point, if that is OK.
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.
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 (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).
Karsten
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