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: Marco Ugolini <email@hidden>
- Date: Fri, 10 Oct 2008 01:08:10 -0700
- Thread-topic: On the use of wide-gamut RGB working spaces
In a message dated 10/9/08 12:45 AM, Karsten Krüger wrote:
> 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.
Karsten,
Allow me to ask you this, without either malice or sarcasm: if you receive
an image file in ProPhoto RGB, do you perform an intermediate conversion to
an RGB working space smaller than ProPhoto RGB (sRGB, AdobeRGB, or ECIRGB,
etc.), and only then to your chosen CMYK print output space?
My point being that the 2-step conversion (RGB-RGB-CMYK instead of just
RGB-CMYK) probably does not change the end result appreciably from what it
would be if you performed a conversion straight from the ProPhoto RGB file,
with all the due cautions and careful use of adjustment layers. Actually, it
might even *hurt* the results, because the matrix-to-matrix conversion to
the intermediate RGB profile may actually clip saturated detail that the
matrix-to-LUT conversion from RGB to CMYK would have a chance to preserve.
Best.
Marco Ugolini
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