Sooner or later, Sodipodi needs to implement some SVG
filters, not necessarily all of them at once, but a few
would be good. One filter that I think would be worth
considering is feColorMatrix. With this filter,
Sodipodi could implement a few Photoshop-esque
functions like Channel Mixer, Hue/Saturation,
Desaturate, Colorize, and possibly other color tricks.