Re: A Different Profiler Pro Question
Re: A Different Profiler Pro Question
- Subject: Re: A Different Profiler Pro Question
- From: Don Pushies <email@hidden>
- Date: Thu, 7 Nov 2002 12:01:57 -0500
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
------------------------------------------------------>
David,
Thanks for responding. You are absolutley correct. I was, in fact refering
to ProfilerPlus. My confusion was compounded by not fully recognizing the
differences between the two.
Your points on the IT8 target are good ones, and I would be wise to keep
them in mind when using any target.
I can see that I need to upgrade my tools; scanner, printer et al(not to
mention clients and skill set), and get a spectrometer before ProfilerPro
or other profile app will do me any good. But I can say I am much further
along the colormanagment trail using ProfilerPlus to make icc profiles.
I'll tweak and be happy with that for a while.
Regards,
Don Pushies
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