[sane-devel] meaning of "--contrast" option to backend

Major A andras@users.sourceforge.net
Tue, 13 Jan 2004 17:15:40 +0000

> I was just curious if specifying a contrast argument to the backend
> is different from doing a default scan and adjusting the contrast in
> the gimp after the scan.

The contrast argument is not a standard option, so it depends on the

Gamma curve adjustment is often better done in the scanner, simply
because the scanner often has a deeper A/D converter than the 8 bits
per channel of the data you get from it. Therefore performing the
adjustment in the scanner gives better results.

On a slow computer, you can also save time by having the scanner do
the adjustment.


Major Andras
    e-mail: andras@users.sourceforge.net
    www:    http://andras.webhop.org/