Hello,
I have an HP-4200C usb scanner, connected to a PC running linux; a
no-name video card, and a no-name monitor. The images that I scan are
too dark. Users of hp4200c driver -- how do you scan your photos ?
The options for this scanner do not include the brightness
option, though there are --gamma-table options (separate for red, green,
and blue).
I could not figure out what table should I specify to fix my
pictures. So I used ImageMagick's "mogrify -gamma 2.2" to lighten up the
images. Nevertheless, the images turn out slightly different from the
originals.
Well, I knew how to use mogrify because it only wants a single value, namely
the gamma correction ^ratio^. How would I do the same with a gamma ^table^,
and would I get better results anyway ?
Thank you,
Boris
P.S. Scanning often hangs my machine, particularly if I press Ctrl-C
during a scan, and then try to scan again. I guess that the lamp is not
returned into a proper place. Has anyone had this ?
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This archive was generated by hypermail 2b29 : Mon Jan 22 2001 - 23:44:37 PST