On Mon, 2019-07-15 at 10:57 +0800, lum...@shangyuekeji.com 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.
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