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Math Behind Unsharp Mask

I looked at how Unsharp Mask is produced in GIMP according to this:

http://docs.gimp.org/en/plug-in-unsharp-mask.html

Yet, its result are poor compared to Photoshop's implementation.

I could reproduce Photoshop's effect using Gaussian Blur, Layer and Apply Image in Photoshop according to this:
http://www.lynda.com/Photoshop-tutorials/Building-your-own-USM-Gaussian-...

Taxonomy upgrade extras: 

acv2gimp: convert Photoshop curves to gimp format

This is not my script, I just found it and felt it should have a link from the registry:
https://github.com/suapapa/suapapa_snippets/blob/master/acv2gimp.py
It converts Photoshop curves files to Gimp format.

Example usage:
python2 acv2gimp.py mycurve.acv -o ~/.gimp-2.8/curves/mycurve.crv

Photoshop Pattern Loader

Plugin to load Photoshop PAT patterns set as image in GIMP. Multiple patterns included in a file are loaded as layers. Should handle Grayscale, Indexed and RGB patterns ; anyway, a RGB image is always created for now. Requires Gimp 2.4.

User Filter

This plug-in enables you to use the vast number of existing filters made for Photoshop's Filter Factory as well as create new effects without having to go through the process of learning how to write plug-ins for The Gimp first.
Originally written by Jens Restemeier for Gimp 1.x back in 1997, this plug-in has now been updated for use with Gimp 2.x.
Project homepage is at http://gimpuserfilter.sf.net/
You can find lots of free FF filters that can be imported into User Filter at http://www.photoshop-filters.com/

Abr brush loader

Plugin to load Photoshop ABR brushes as image in GIMP. Multiple brushes included in a file are loaded as layers. Should handle v1, v2, v6.1 and v6.2 sample brushes (though I don't known which PS release create each). Requires Gimp 2.4.

Bugzilla #377016 for v6 brush support

Photo effects

This is a compilation of some wonderfull scripts of Iccii and some other scripts I 've made myself, all brought together is one script-fu file to make the installation very simple.

Contains : Cartoon, Color pencil, Conte crayon, Cutout, Drawing, Inkpen, Note Paper, Paint dot image, Palette knife, Pastel, Stamp, Water paint effect, (plastic) Wrap effect. Angled strokes, Crosshatched, Chrome image, Cross light, Funky color, Soft focus, Solarisation, Brick wall, Patchwork, Stained glass, Texturizer, High pass, Scroll, ...

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