Re: A Different Profiler Pro Question
Re: A Different Profiler Pro Question
- Subject: Re: A Different Profiler Pro Question
- From: email@hidden
- Date: Thu, 7 Nov 2002 00:26:05 EST
In a message dated 11/6/02 8:11:13 PM, email@hidden writes:
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To profile a scanner the docs direct you to print a target and scan the
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print. These are compared via an Automate plug-in in PS. I am skeptical
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that the software can profile the scanner only, when it is using a print
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from an unprofiled printer for the target. The docs then have you print a
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test image, compare and tweak, and this becomes your printer profile.
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It seems to me these two profiles would only be effective in tandem(scan to
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print)as neither is an accurate profile of either device exclusively. It
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also occurs to me that it might be less accuarte than scanning a IT8 target
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for comparision, using that profile for the input, and then print the test
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image and tweak.
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Do I have this right?
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You have it wrong in few places, but I think I follow your logic. For
starters, ProfilerPRO does not profile scanners. Second it is ProfilerPLUS
(or the ProfilerPLUS features included in ProfilerPRO) that uses a scanner to
read the target for printer profiling; the usual ProfilerPRO routine avoids
this whole issue by using a spectro to read the patches.
But yes, using a scanner introduces errors to the printer profiles. The
question is whether adding an IT8 target to the mix reduces the problems. The
IT8 is a photo target, and you are comparing it to inkjet or other nonphoto
output, under the light color of the scanner, so colors may mismatch,
variable number one... the gamut of the inkjet print exceeds the IT8 gamut on
many media, causing extrapolation... the gray ramp in the IT8 isn't
necessarily neutral, an interpolation... and of course the batch data file
with the target is an approximation as well... the photo paper does not have
the same paper tone as your inkjet paper, and lacks the whiteners your paper
may or may not have... etc.. once all these interpolations, extrapolations,
approximations and errors are tallied up, its easy to see how this step may
or may not improve the accuracy of the process. Even profiles made with an
IT8 involved tend to need editing to make them usable.
C. David Tobie
Design Cooperative
email@hidden
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