RE: Experience with Epson's new Standard Proofing Papers 240

Hi Terry,

I'm seriously abandoning our current brandX proofing paper. I've tested both
the 205 gsm (7mill) and the 240 gsm (9mill) versions, here, with both an
iSis and a DTP70, and the odd thing is that they both produced more reddish
tones than my current brandX, which I trust visually like the gospel,
despite getting for the same 0.50 average dE on both papers. 

The Epson papers don't glow as much as my brandX paper under a UV lamp so,
in principle, I reasoned that their calibrated appearance ought to be even
better, visually, than brandX but the appearance difference between the two
papers has me thinking twice about switching. Not that the difference is
extreme but it is there nevertheless. It is there on the C1, C3 and C5
conditions. 

I thought, at first, that the "error" stemmed from the iSis itself, but then
I go the same "error" with the DTP70. So the instrument is not the at cause
here, IMO. Although I plan to redo my experiments using the iO table, the
Spectroscan and the iCColor.

I'm at my wits as to which one to trust visually, you know. Since they both
bring in a respectable 0.4 to 0.5 average dE, similar max too, compared to
the IDEAlliance datasets. 

I have tried using some independent color visual references like a
ColorChecker chart or a ColorChecker DC, to have some "objective" basis of
comparison. But it turned out that both simulations had about the same
visual errors. The flesh patch, for instance, lacked a bit of yellow, in
both cases, and the brown skin patch (same chromaticity as the light flesh
patch, btw, bever realized that until I actually measured it) was not even
close. My tests consists of converting a custom measured CIELab version of
the ColorChecker chart to either C1 or C3 or C5 using AbsCol, and then
compared to the proof, on both kinds of paper.

To rule out the possibility of lighting, I stepped outside to observe the
proofs under "daylight" (fair bit of direct sunlight in my case) and most of
the patches were very close  again visually, across the two papers, to the
ColorChecker chart, except for the dark (brown) skin patch, as was the case
under my ISO-3664 viewing booth.

One last note. I happen to have access to both a JUST-Normicht booth and a
GTI booth in my office. Using the IDEAlliance proofing form page 2, under
both lights, compared to my regular brandX paper, it was interesting that
the visual difference tended to vanish under the GTI lamps where it was
plain visible under the JUST lamps.

Ah! Color, an endless quest...

Best / Roger



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