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Re: CMYK spaces used for document creation

On 3 Nov 2009, at 12:27, Roger wrote:

Chris,

I would
not consider the well behaved output of any/all ProPhoto RGB (or
CIELAB) based synthetic targets to be an appropriate metric for
successful CMS performance.

Chris Murphy

This is a very sensible statement. Which raises the issue of just what to
based a profile conversion's results evaluation on. What are your thoughts
on that? Would you care for using some standard ISO sRGB or Lab images
(ISO-12640), as a starting point, so we could all be on the same page? Or
would you have something else in mind?

As well as seeing plenty of SWOP CMYK making it into the proofing queues for ISO Coated v2 I'm also seeing more and more ProPhotoRGB files coming in for separation or retouching.

Adobe have made this a "standard" for wide gamut images and there are plenty of photographers wandering around with the sincere belief that processing RAW files into anything smaller will destroy valuable data in their images.

These images are one edit away from the imaginary colours which you can see ruining the "blue balls" of the Twenty-Eight Ball test chart.

Somebody has to deal with this when the images are converted for print -- how are we to explore these problems without using synthetic targets in an Adobe recommended colour space?

Again I'd suggest looking outside of Photoshop to handle conversions from ProPhotoRGB.

A practical solution offered by the ArgyllCMS is per-image gamut analysis prior to conversion.

--
Martin Orpen
Idea Digital Imaging Ltd


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References: 
 >Re: Colorsync-users Digest, Vol 6, Issue 267 (From: Phil Cruse <email@hidden>)
 >CMYK spaces used for document creation (From: "dpascale" <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Martin Orpen <email@hidden>)
 >Re: CMYK spaces used for document creation (From: "dpascale" <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Andrew Rodney <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Martin Orpen <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Andrew Rodney <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Martin Orpen <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Andrew Rodney <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Martin Orpen <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Chris Murphy <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Martin Orpen <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Andrew Rodney <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Martin Orpen <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Chris Murphy <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Graeme Gill <email@hidden>)
 >Re: CMYK spaces used for document creation (From: Chris Murphy <email@hidden>)
 >RE: CMYK spaces used for document creation (From: Roger <email@hidden>)



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