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: Fri, 10 Oct 2008 10:57:43 +0200
Am 10.10.2008 um 10:08 schrieb Marco Ugolini:
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
Marco,
Due to the large ProPhoto color space I would not use an automated
color workflow.
I would take some time to check which conversion yields the best
results (which
depends on the actual image and the intended output destination - web,
offest etc.),
starting with relative colorimetric rendering, then trying if black
point compensation
is necessary.
If a 2 step process is needed (because the output is unknown, or due
to editing needs
as pointed out before) I would do a relative colorimetric conversion
to eciRGB_v2 and
then start doing what needs to be done. But I have to admit that my
primary focus
is offset or ISOcoated optimized digital printing.
My 2 points here: manual processing, colorimetric rendering is first
try.
Karsten _______________________________________________
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