Comment 8 for bug 171181

The 'Color' extensions [1] implement most the requested features:
- Grayscale
- Desaturate
- Brighter/Darker
- Less/More Light
- Less/More Hue
- Less/More Saturation
(These extensions allow to lower or increase the hue, saturation and light of a selection, but not to choose the amount, and thus still can be improved).

…as well as other functions based on RGB values:
- Custom: transformation functions can be defined for R, G and B
- Negative
- Remove Red/Green/Blue
- Replace
- RGB Barrel

Additionally preset 'Color' SVG filter effects [2] add further options to manipulate the color of selected (bitmap and) vector objects.

Proposing to close the report as 'Fix Released' (the color extension scripts had been added in Inkscape 0.45, 2007-03-20 [3]).

[1] <http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Extensions-Color.html>
[2] <http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Filters-Preset-Color.html>
[3] <http://wiki.inkscape.org/wiki/index.php/Release_notes/0.45#New_effects>