Descreen is a script that does descreening using the FFT Fourier plugin ( http://registry.gimp.org/node/19596 )
This script does descreening without blurring the image.
It can descreen the following picture :
And gives the following picture :
I would like a script doing the opposite to add screentones
I made a batch version when I had lots of 600dpi B/W scans with black half-tone (=gray) text backgrounds and OCR in Acrobat therefore didn't work in these sections.
Get it here:
Descreen works fine on win7 when applied to the whole image. But I have been unable to get it to work within a rectangular selection. Applying it to a selection causes the content of the selection to be completely messed up.
Is it supposed to work within a selection?
Also, the HELP button doesn't work so I don't know what the three controls mean.
There's a problem in that the descreen script assumes the FFT plugin sets the current ink color to the right value, but the current FFT implemenation doesn't.
Workaround: set your foreground color to mid gray = #808080 before invoking script.
Fix: alter script to add this line after "; Foreground color has been set by the FFT plugin to #808080"
(gimp-context-set-foreground '(128 128 128)) ; midgray 0x0808080