[sane-devel] ICC, white marks, gamma table, scaling artifacts
emailgrant at gmail.com
Thu Jul 15 00:03:56 UTC 2010
I'm using scanimage to make the most accurate scans I can and I have a
few questions. Many thanks to anyone who can help with any of these
I've posted on this subject before and Allan told me I should scan a
color target along with my scans so I can apply an ICC profile. Can I
order a color target online? Is there a particularly one to get?
I'm getting vertical line artifacts whenever I scan the back of a CD.
I've attached an example of this. Allan told me I should calibrate
the scanner, but I've checked the manual, searched the unit's front
panel, Googled, and called Epson but there doesn't seem to be a
calibration procedure. Does anyone know how to set up a "white marks"
target to eliminate the artifacts?
I saw mention of gamma tables in the scanimage man page. Is it
necessary to use a gamma table for accurate scans?
When I started scanning at 600 resolution instead of 300, I noticed
patterned artifacts would appear on the images if they were zoomed to
certain levels. For example, the artifacts appear at 50% zoom level
in both gimp and gthumb but not at 25% or 100%. It seems like this
might have to do with the tiny dots that make up the printed images
I'm scanning? Can I prevent it from happening?
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