Re: [Gimp-developer] To consult the algorithm of photocopy filter
Liam R E Quin <[email protected]>
| Newsgroups | gmane.comp.video.gimp.devel |
|---|---|
| Message-ID | <[email protected]> |
On Mon, 2019-07-15 at 10:57 +0800, [email protected] wrote: > Dear all developers: > I want to consult the algorithm details of photocopy filter in > photocopy.c, especially the paper or description. I don't understand > the algorithm although I have read the description in photocopy.c. > Thank you. Note, this is a gegl fillter; i don't know if there is a specific paper. it looks like it does (more or less) (1) make two blurred copies of the input with different radii (2) use these to make a histogram to count values & determing a threshhold (3) for each input pixel, if the corresponding blurred value is less than the computed threshold, make it black (0 value) else make it brighter. Liam (slave ankh) -- Liam Quin - web slave for https://www.fromoldbooks.org/ with fabulous vintage art and fascinating texts to read. Click here to have the slave beaten. _______________________________________________ gimp-developer-list mailing list List address: [email protected] List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list