Am 04.11.2010 03:41, schrieb Akkana Peck: > Per Tunedal writes: >> I would be happy if there was two more filters: >> >> remove green eyes and remove yellow eyes. >> >> Or maybe a filter with an option to chose which colour to remove. > > I've wanted that too. You can do it the old way (the way we used > before the red-eye filter was added in GIMP 2.4): select the pupil, > perhaps with the ellipse selection tool, then use something like > the Hue-Saturation tool to desaturate and darken. > > But it doesn't work as well on animal eyes as on human, because > animal pupils are often much larger and is very light, and it's > hard to make it turn black. Sometimes I have to paint in some black. > Also, the animal pupil colors tend to be a lot less saturated than > human redeye, so it might be harder to write a tool to select it > in an automated way. > > Anybody have a reliable way to deal with animal greeneye? > Please share techniques!
You could also use the following: (a) The Colour-Match plug-in (select eye region, select colour to substitute within the region and the colour you want it to change into) (b) The User-Filter plug-in (you can adopt the formula for the red-eye reduction for other colours - especially green should be fairly easy). The formula is not as accurate as the native red-eye reduction since User-Filter does not use floating point values, but it still works pretty well - in fact, I think it is an old formula of the native plug-in. I don't have a working example of green-eye reduction (lacking some proper animal pictures) but you can still play around with the formula for red-eyes (ctl(0) being the slider which controls the sensitivity for colour removal): R=(r/5>=g-ctl(0))&&(r/5>=b/2-ctl(0))?g+b/2:r G=g B=b A=a Torsten
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