Gamut Clipping converting from NKAdobeRGB to AdobeRGB
Gamut Clipping converting from NKAdobeRGB to AdobeRGB
- Subject: Gamut Clipping converting from NKAdobeRGB to AdobeRGB
- From: Doug Walker <email@hidden>
- Date: Thu, 23 Dec 2004 06:56:50 -0800
I read something very interesting in the latest CHROMiX ColorNews
Issue#16 newsletter that got me thinking.
A great read for those of us still getting fully around these issues.
Steve Upton mentions: "when converting from a scanner or camera profile
to a working space the ONLY rendering intent available (in many cases)
is relative colorimetric. Again, Photoshop will let you think you have
others available but they are not contained in the profiles and
choosing them will still give you relative colorimetric. As a result
of these missing intents, you run the risk of clipping out-of-gamut
colors AND because many of them are outside of your monitor's gamut you
won't notice the problem until you go to print."
OK, here is my question following my particular scenario.
I shoot RAW with the D1x and almost always choose Mode II or Nikons
equivalent to AdobeRGB as the intended destination working space. If I
understand this whole thing, the RAW CCD dump gets converted from the
camera via Nikons proprietary input profile and spits out the resultant
processed image in the Nikon 4.0.0.3 Adobe RGB (NKAdobe.icm or
something like that) which is essentially the same as AdobeRGB.
Further, it has been noted in several places that Nikon had dropped the
media black point tristimulus tags from all the standard color space
profiles (sRGB, Bruce, Wide, etc.). Don't know why. In all the
standard color space profiles, the media black point tristimulus is set
to 0,0,0 so I doubt that omitting it is a big deal, since it's likely
that the CMMs assume values of 0,0,0 if the tag is missing.
Further, Further.....Wait.....But no client has this Nikon profile
(well most clients anyway).
So to make things normal I have always done a 'Convert to Profile' into
chosen my Working Space profile AdobeRGB. This is a RelCol transform
as Steve mentions above. No other option.
Would going from one essentially same size container to another via
RelCol clip colors? Aren't these essentially an exact overlay?
Guru's?
Doug Walker, FP
"Specializing in Corporate People in their Workplaces in a Clean, Bold
Classic Style!"
website: http://www.walkerphoto.com
Phone (360) 943-1293
Member, ASMP, APA SF
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