Re: Scanner Profiles -- Two Part Question...
Re: Scanner Profiles -- Two Part Question...
- Subject: Re: Scanner Profiles -- Two Part Question...
- From: Steve Upton <email@hidden>
- Date: Wed, 3 Jan 2001 10:34:33 -0800
At 10:33 AM -0500 1/3/01, James Kober wrote:
Hi All,
I've recently made some scanner profiles that look real good. While
making them
I thought of some questions for the group:
1.) How do we test scanner profiles? Besides making a visual
evaluation, how do
we test scanner profiles?
Load the IT8 scan into Photoshop and Profile to Profile (or Convert
to Profile in PS6) to Lab using the scanner profile. Compare the Lab
values you see in Photoshop with the Lab values in the target data
file that came with the IT8. That's the slow way.
A better way is to:
- convert the file to Lab as above, crop it, and save it as a Lab TIFF
- download ColorLab from www.logosoft.de (go to the updates area)
- open the file in ColorLab and convert the file to "spot colors"
- this results in a file that is a text file - save it
Is there any way to use the Compare Tool in ProfileMaker to see how close of a
match I have to my reference file after applying the scanner profile?
if you follow the above methods then yes. You need two text files of
Lab values, the original TDF that shipped with your IT8 and the
converted Lab file from the scan.
You can also then load these Lab files into our ColorThink software
and do a 3D vector graph. This graph shows, in 3D all the color
shifts / errors that exist between two files.
2.) Assign Profile in Photoshop 6 - When I assign a scanner profile
to an image
in Photoshop 6, why don't the pixel values change? I understand the
profile is a
definition of the way myscanner sees color, but wouldn't you want the actual
pixel values to change and not just the preview?
No you don't want the values to change. You are basically telling
Photoshop where the color came from. PS should then display it
correctly. It will also use the scanner profile for when you convert
the file to a working space or printer space.
Regards,
Steve Upton
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