Need some help with iQueue...
Need some help with iQueue...
- Subject: Need some help with iQueue...
- From: "CS Carl Stawicki (4211)" <email@hidden>
- Date: Wed, 7 May 2003 16:36:54 -0400
Hi all,
I am currently conducting tests on iQueue 1.1 (demo mode). I am really
stumped by a problem I'm having while converting grayscales.
To keep it simple, the file I'm converting is a 50% black patch tiff. I'm
using Photoshop's canned 10% and 30% dot gain grayscale profiles for source
and destination (so my custom profiles don't become a factor in testing).
I'm comparing iQ conversions to ones done in Photoshop. I compared
conversions made with the same CMM's in iQ and PS (set through ColorSync),
which gave me the same results as LogoSync, so CMM's are not a factor for
these particular tests. I'm using RelCol for all conversions, and comparing
before-and-after L values to determine the accuracy of the conversions. Here
are my results:
Source tiff: 50%k assigned 10%dg = 70L
Photoshop conversion:
Converted to 30%dg = 33%k = 70L (perfectly logical)
iQ conversion:
Converted to 30%dg = 67%k = 33L
My exact iQ ICC Option settings are:
Source Profiles(tab):
Grayscale Images: Profile "Dot Gain 10%.icc", Rend.Int. "Relative"
Grayscale Vector Graphics: Profile "Dot Gain 10%.icc", Rend Int. "Relative"
Destination Profiles:
Destination Profile "Dot Gain 30%.icc"
(Simulation and Abstract Profile not checked)
Other Settings:
Embedding: both options checked
CMM: LogoSync
Preserve Black: both options not checked
I've tried different settings in iQ, like assign source profile or use
embedded, different preserve black settings, etc, with no success. The only
way I could remotely reproduce iQ's results in PS was to:
1) Assign 30%dg (50%k = 52L), 2) Convert to 10%dg (70%k = 52L), and 3)
Re-assign 30%dg (70%k = 29L)
I get the same results from PDF's with vector information. I understand that
the results between iQ and PS may not be perfectly consistent, but my iQ
results are totally illogical. This is something I can't figure out by
myself, and I have tried tech support.
Thanks for everyone's time.
Carl.
>
Mac OS 9.2.2
>
iQueue 1.1 (demo)
>
Photoshop 7.0.1
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