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+--- Thread: filter math (/Thread-filter-math)
filter math - buffalo - 04-19-2018
How do I obtain the algo/kernel/convolution mask for the various filters in gimp?
For instance, I was interested in the numbers behind https://docs.gimp.org/en/plug-in-oilify.html
so I could customize them per my needs, and create new filters per my needs.
RE: filter math - rich2005 - 04-19-2018
Quote:...snip...so I could customize them per my needs, and create new filters per my needs.
Some of these old Gimp plugins are more than a bit obscure in how they work
Somebody might be able to tell you.
For example this code, https://github.com/GNOME/gimp/blob/master/plug-ins/common/oilify.c It is commented & you might glean a little insight.
You might be better off using the functions from an existing plugin, I am thinking of the gimp plugin gmic.
Try asking your question on https://discuss.pixls.us/ the creator of gmic looks in there.
RE: filter math - buffalo - 04-19-2018
(04-19-2018, 04:13 PM)rich2005 Wrote:Quote:...snip...so I could customize them per my needs, and create new filters per my needs.
Some of these old Gimp plugins are more than a bit obscure in how they work
Somebody might be able to tell you.
For example this code, https://github.com/GNOME/gimp/blob/master/plug-ins/common/oilify.c It is commented & you might glean a little insight.
You might be better off using the functions from an existing plugin, I am thinking of the gimp plugin gmic.
Try asking your question on https://discuss.pixls.us/ the creator of gmic looks in there.
thanks i'll try there.
RE: filter math - rich2005 - 04-20-2018
In case you ever come back
There is a old java application 'painterly' which can create an 'oilify' type of effect.
This page: http://www.mrl.nyu.edu/publications/painterly98/ has a PDF with details of the algorithms.
This page has various papers for various graphics projects http://www.dgp.toronto.edu/~hertzman/research.html Might be worth a trawl through.