[sane-devel] Please help for my Xsane settings

[m. allan noah]

In general, it is better to use the brightness/contrast/gamma controls
provided by the backend, instead of those provided by Xsane. Usually
they are hidden in some other window, which must be enabled from the
Xsane menu bar, though some backends dont provide these controls.
Unfortunately, you did not state what scanner you are using, so it is
hard to help you further.

allan

On Mon, Jan 25, 2010 at 11:38 PM, Jin Chen <chenjin824 at gmail.com> wrote:
> Hi All,
> I've been playing with the settings for quite a while and the scanning
> results are still not good enough.
> I was using Xsane 0.996 under Ubuntu 9.10 to scane blank writing pad paper
> with rule-lines. Note the paper is white and has no
> ink at all, except those rule-lines. When I scanned this kind of paper, the
> result image is always too bright to see the rule-lines (which are my
> concerns).
> Case1: true-gray model, 600dpi, gamma = 0.3 (minumun), brightness =
> -100(minumun), contrast = 100(maximum), I get a result with partial visible
> rule-lines, but
> the quality in general is not good. I tried to modify the threshold
> parameters in the  Preference->setup->enhancement, but no luck -- maybe I
> can't fully understand
> those threshold minimum(0), maximum(20), multiplier(12.5). Anybody can help?
> Case2: Black&White, 600dpi, It didn't matter what gamma, birghtness, etc
> were, the results were almost always a white image -- no rule lines are
> visible at all.
> Note that if I scanned it in a color model, I can see the rule-lines easily.
> However, I don't want to do the follow-up converting work; I want everything
> that comes out of
> the scanner to be original and raw.
> If possible, I'd like to scanned in both gray model and BW model
> respectively, and at the same time make the rule-lines as clear as possible.
> If anybody has done this before
> or have any ideas how to play with those parameters, I'd be more than happy
> to hear.
> I appreciate your help!
> Sincerely,
> Jin Chen
>
>
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