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Digital BW, The Print

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Re: [Digital BW] Re: pshop 6->7 VM (isolating just 6 to 7 discrepancy)

2002-06-27 by Carolyn Frayn

I tried both (gamma2.2>sRGB) and (gamma2.2>Adobe1998) out of curiousity.

then tried my CMYK conversion, yes, the same, the median and std dev are
different (but so very slightly).

in my cmyk convert, the mean value differences from PS6 to PS7  I'm getting
are 133.36 vs 133.27  and standard deviation value differences are 95.15 vs
95.03

You are getting more histo variance from PS6 to PS7 converting to sRGB than
to Adobe1998.

I can't find any info on this in the photoshop forum at adobe, curious
thing... should pose a question there perhaps.  Perhaps the same is true of
the PS5.5 to PS6 change, that the conversions are mapped better with each
upgrade.

Two other points, this variance occurs using any intent, and it occurs when
doing an RGB to RGB conversion as well.

I don't see how this is causing such a drastic change in your print though,
I believe it is a different issue.

Carolyn


> Jim,
> 
> I just wanted to point out one difference in our file conversion process.
> You converted to sRGB in both PS6 and PS7 while I converted to Adobe RGB in
> both. I don't know if this is significant but a variable to keep in mind.
> 
> I hope it is just a workflow adjustment issue and not something mechanical.
> 
> Martin Wesley

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