Re: Redeye algorithm

["Marcus Hast" <marcushast gmail com>]

> Please could you have a look at this and see if you think it's any use. It
> works by clamping the green to no more than twice the blue level and then
> clamping the red to no more than twice the green level.  You could possible
> make it  little more strict by using 1.5* instead of 2*. You need to leave
> some leeway for pinkish shades though, for when people accidentally select
> flesh rouns the eyes, and for coloured reflections in the pupils.

Are there any standard algorithms for this? It seems "reasonable" that
what it "should" do is look for a bright red colour and change that to
black. It might be easier to do that using luminance values though.
(And looking at the luminance and Cr / Cb values.)

What does the current implementation in F-Spot do?

I know from experience that the algorithm in Picasa has a tendency to
work quite poorly.

/Marcus Hast