Re: MultiProfiler question
Re: MultiProfiler question
- Subject: Re: MultiProfiler question
- From: Terence Wyse <email@hidden>
- Date: Fri, 27 Jul 2012 12:39:12 -0400
In case anyone had any doubts what the Blurb ICC profile is modeling, it's definitely GRACoL2006 Coated1, right down to the paper white L*a*b*. What they're using is essentially a copy of the IDEAlliance GRACoL profile and has little to do with how they're actually printing.
Here's a dE2000 report from ColorThink Pro comparing GRACoL Coated1 to "Blurb_ICC_Profile.icc". I used the Hutch Color HC2052 RevF CMYK values and assigned each profile to this color list in a CTPro worksheet and compared (the GRACoL profile I used was one of my own making using the GRACoL dataset but using i1Profiler to build the profile:
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dE Report
Number of Samples: 2052
Delta-E Formula dE2000
Overall - (2052 colors)
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Average dE: 0.21
Best 90% - (1846 colors)
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Average dE: 0.19
Worst 10% - (206 colors)
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Average dE: 0.44
Max dE: 0.82
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Here's the same comparison only this time using the official IDEAlliance GRACoL profile and comparing to the Blurb profile:
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dE Report
Number of Samples: 2052
Delta-E Formula dE2000
Overall - (2052 colors)
--------------------------------------------------
Average dE: 0.00
Best 90% - (1846 colors)
--------------------------------------------------
Average dE: 0.00
Worst 10% - (206 colors)
--------------------------------------------------
Average dE: 0.00
Max dE: 0.00
--------------------------------------------------
Uh, YEA, I'd say the Blurb profile is an exact duplicate of the official IDEAlliance GRACoL profile! :-)
As a side note, my i1Profiler "GRACoL" profile is a closer match to the actual GRACoL dataset than the "official" IDEAlliance profile...go figure:
i1Profiler GRACoL profile compared to GRACoL dataset:
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Delta-E Formula dE2000
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Average dE: 0.11
Worst 10% - (163 colors)
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Average dE: 0.24
Max dE: 0.46
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"Official" IDEAlliance GRACoL profile compared to GRACoL dataset:
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Delta-E Formula dE2000
Overall - (1617 colors)
--------------------------------------------------
Average dE: 0.18
Worst 10% - (163 colors)
--------------------------------------------------
Average dE: 0.26
Max dE: 0.70
--------------------------------------------------
What's bothersome to me about their supplied profile is this likely doesn't represent how they're actually printing, they're just using GRACoL as a generic CMYK target or "working space". The papers they're using certainly don't match GRACoL and, in my experience profiling Indigos and other digital presses, these devices typical don't match GRACoL...although using profiles or device links and internal color management they can get reasonably close.
Regards,
Terry Wyse
______________________________________
Terence Wyse, WyseConsul
Color Management Consulting
G7 Certified Expert
FIRST Level II Implementation Specialist
On Jul 27, 2012, at 12:01 PM, Andrew Rodney wrote:
> On Jul 27, 2012, at 9:33 AM, Terence Wyse wrote:
>
>> Isn't at least one of the issues is that Lightroom is sending sRGB to Blurb......sending AdobeRGB isn't even an option?
>
> Yes and no (not an option). The upload converts everything to sRGB. Same with export to PDF. FWIW, Aperture is sending Adobe RGB (1998) which one can check by examining the PDF one can optionally export.
>
> Plotting the Blurb CMYK profile (which questionably defines the actual print process) next to sRGB in ColorThink shows the CMYK profile has a pretty nice chunk of green and teal/blue and a smaller chunk of yellow that falls outside sRGB. Adobe RGB nearly contains the entire gamut. So in this context, Adobe RGB would be ‘more better’ <g>.
>
> Andrew Rodney
> http://www.digitaldog.net/
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