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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