Re: Color Quartet and ICC profiles
Re: Color Quartet and ICC profiles
- Subject: Re: Color Quartet and ICC profiles
- From: Nick Wheeler <email@hidden>
- Date: Fri, 11 May 2001 10:16:10 -0400
Hi Roberto:
on 5/10/01 9:36 PM, Roberto Michelena at email@hidden wrote:
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> Default Tone Response curve means turn color management on or off.
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I am not sure of this... I believe DTR, if selected, comes before color
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management, sort of "linearizing" the scanner before profiling.
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I believe this because if I profile with different IT8 targets/data
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files, even having DTR on, I get different results. If DTR were disabling
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IT8 calibration, this wouldn't happen.
Yes you will get different results with DTR turned on as CQScan will use a
default profile (tone response curve) if it is not "pointed" at anything
else, therefore you will see changes in the preview scans when this is
turned on and off. I believe that DTR should be turned off to place the
scanner in as raw a state as possible, before you do a profile. Otherwise
you are profiling a profiled scan so to speak, and then changing the
original profile that you just got through using to make the new profile.
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> So to use CQ it is best to check default tone response curve off. Then do an
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> IT8 scan with minimal correction to the scan. Say auto neutral the 50% gray
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> and set the highlight and shadow with some headroom. Save these scan
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> settings as "site color" and leave them there for all future scans with this
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> particular profile you are generating. You may want a few variations for
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> different types of originals. Say a high key, low key, flat and contrasty
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> set of "site color" settings and profiles. Go ahead and scan the same target
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> with these different settings.
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You mean do different scanner profiles? these corrections usually are
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made in output profiles I believe...
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Or I am not getting it... you mean just having "site colors" to apply
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after the profiled scan?
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The profiled scan should per se neutralize the gray wedge (as long as
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it's neutral in the target) without the need for adjustments...
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> Use Linocolor to create the profiles, it seems to work best.
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You mean Linocolor or ScanOpen ICC? have you tried both?
I mean ScanOpen, sorry. I have an old copy of it here left over from an
early version of LinoColor lite that came bundled with a scanner that has
long since gone to scanner heaven. The software lives on...
Praxisoft's scanner profiling also works well, make sure to use "Absolute"
as your default. I just prefer the ScanOpen profiles a little better, I am
sure others would choose something else. All this stuff is incredibly
subjective.
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You are then indeed talking of having a variety of scanner profiles...
Yes if you like, although with CQ it is difficult as you have to do an Edit
preferences in CQ Scan and change the Site color in CQ. I believe you also
have to restart CQ Scan to get it to recognize the profile change.
This technique is useful if you plan on doing most of your editing in
another application. Imagine two separate workflows:
Workflow #1: You plan to do most of your editing in Color Quartet. Then you
really only need one profile. I use David Tobie's recommendations for
setting up the it8 scan and I save his scan settings as my site color. I
then save the scan as an 8 bit tiff file in my Photoshop working space
(Ektaspace). Then minimal edits in Photoshop and I'm done. The work I do in
Photoshop is only possible on 8 bit files anyway.
Workflow #2: You plan to do all your editing in another application. Here it
would be nice to have maybe three or four different sets of scan settings
and profiles to produce a scan that is in the right ballpark, then save it
as a 16 bit tiff file in the proper destination color space. This works well
for negatives. I used to scan negatives as though they were transparencies
and then invert and do all my editing in Photoshop, when I still was using
Color Quartet for that purpose.
I now have a new and much better system for scanning color negatives. I send
them to Mark Doyle at Autumn Color!
Best wishes,
Nick Wheeler