[sane-devel] Custom Gamma Curves

[Oliver Rauch]

Martin Collins schrieb:
 
> I am trying to scan some old comics that have very yellowed paper. I
> want to set the "whitepoint" for each color to the minimum required
> to get a white background. With the colours mixed in the preview it
> is hard to see where this is. If I could see just the blue (say) as
> I adjust the "bluepoint" it would be clear when all the speckles in
> the background disappear.

Click the "RGB Bind" Button in the xsane main window
so that you get a slider for each color. Then use the pipette
function in the xsane preview window and click a point with
the middle mouse button that you like to define as white.

Bye
Oliver

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