[sane-devel] ICC, white marks, gamma table, scaling artifacts

Grant 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?

white marks
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?

gamma table
I saw mention of gamma tables in the scanimage man page.  Is it
necessary to use a gamma table for accurate scans?

scaling artifacts
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?

- Grant
-------------- next part --------------
A non-text attachment was scrubbed...
Name: artifacts.jpg
Type: image/jpeg
Size: 20925 bytes
Desc: not available
URL: <http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20100714/1b2d2be9/attachment-0001.jpg>

More information about the sane-devel mailing list