[sane-devel] Blank threshold adjustable?

[m. allan noah]

If you are scanning in binary, the sane backend for your scanner would
need to expose brightness/contrast/threshold options, and gscan2pdf
would need to let you change them. You did not say which scanner or
backend.

If you are scanning in gray, and something else is binarizing the
image, I cannot guess the solution.

allan

On Tue, Feb 15, 2011 at 9:02 AM, Werner Holtfreter <Holtfreter at gmx.de> wrote:
> Hello,
>
> I'm using Ubuntu10.10, sane1.0.14-9 (thanks to Robert Ancell for
> PPA) and Jeffrey Ratcliffe's great gscan2pdf0.9.31.
>
> If I scan in colour, white paper is light grey. It could be nice to
> see the exact colour of white, but it is not nice for normal use.
> (And it could make greater a compressed file.)
>
> gscan2pdf --> Preferences --> Blank threshold   did not make a
> difference. I need help to adjust the white level.
> --
> Viele Grüße
> Werner Holtfreter
>
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