big lightness shift with perceptual conversions
big lightness shift with perceptual conversions
- Subject: big lightness shift with perceptual conversions
- From: Ryan Thrash <email@hidden>
- Date: Wed, 20 Nov 2002 23:07:05 -0600
I have a profile generated from a Kodak Q60 target and Monaco Profiler
of our Eversmart Supreme scanner. Here's the workflow currently in use:
1) Scan with fixed density endpoints (same as were used to create
profile) to an 8-bit/channel RGB Tiff file without any sharpening
2) Open in PS 7.0.1 preserving embedded profile. (image is dark, FWIW)
3) Convert to a different color space (i.e., BestRGB) for
manipulation/correction/cleanup
4) Duplicate file & sharpen appropriately
5) Convert to desired color space(s) (i.e. Sheetfed Coated v2) for
output & save with different name
Step 3 is where my question comes into play:
Files from our scanner with the correct assigned/tagged scanner profile
result in images noticeably lightening in the quarter tones when using
Perceptual rendering intent. With Relative Colorimetric/Blackpoint
Compensation, everything visually looks the same.
Is this a normal situation, or is it indicative of a profile gone awry?
Thanks in advance.
--
Best regards,
Ryan Thrash
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