# Re: [umax] Can't use 10-bit scan: "preview cannot handle depth 16"

Oliver.Rauch@Wolfsburg.DE
Fri, 8 May 1998 17:00:35 +0200 (MET DST)

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Hi Paul,

> I put "2"
> into the preview gamma box, and now it's scanning way too brightly. So
> far, I've been unable to get it back to "normal" (erasing
> ~/.sane/xscanimage/* and power cycling the scanner seems not to have had
> an effect - its almost time to read the docs).

enable cusom gamma table,
select "Image intensity" (should be selected automatically)
press the "gamma" button (4. from the top) and enter 1 in the input-window.
select "Red intensity"
press the "gamma" button and enter 1 in the input-window.
select "Green intensity"
press the "gamma" button and enter 1 in the input-window.
select "Blue intensity"
press the "gamma" button and enter 1 in the input-window.

Then try again, now everything should be "normal" dark.

select "Image intensity"
press the "gamma" button and enter 1.5 in the input-window.

Then try again, now the image should be a bit birghter!

You can enter any positive value you like, interesting values
are (normally) between 0.5 and 2.0, but you also may enter 4.0
or 0.1 if you like or need it.

Bye
Oliver

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