> The best result is obtained by scanning in 1200 dpi and reducing the
> file with jpg compression, even though I had expected scanning in 300
> dpi to as good as 1200 dpi.
> SANE does no interpolation and will only deliver the optical resolution
> of the scanner. Is the apparent enhancement of the picture only an
> illusion?
Yes. Interpolation does not add any "inormation". It just places a grey pixel
between a black and a white one.
> It might be a good idea to introduce interpolation into SANE ?
No. It just adds useless data that carries no information to the output.
> Is the algorithms behind this free ?
I hope so. If someone patented this :
interpolated_pixel(between_pixel_1_and_pixel_2)=
( pixel_1*distance_to_1+
pixel_2*distance_to_2) /
( distance_to_1+distance_to_2 )
he is definitely insane.
> How is the interpolation done ? Close to the hardware or on the picture
> after scanning ? E.g. could it be done in GIMP ? -
Yes - choose "resample".
CU, ANdy
-- = Andreas Beck | Email : <andreas.beck@ggi-project.org> =
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