Hi, Daniel Egger <egger@xxxxxxx> writes: > Am 06 Sep 2001 12:56:46 +0200 schrieb Sven Neumann: > > > I think Branko is right here. Color-To-Alpha is not suited for > > chroma-keying since it will remove all shades of blue from all > > colors in the image. Classic blue-boxing requires to clear only > > exactly the color defined as the blue-box background. This can > > easily be achieved using Select-By-Color with a small threshold > > followed by Clear. > > I believe a good chroma keying algorithm would have to work a bit > differently because in real life one has the problem that the blue of > bluebox might vary slightly because of lighting conditions. So maybe the > best would be to go over the HSV colorspace to allow a choosable > variance in the keycolor? Select_By_Color takes care of that but operates only in the RGB domain. It might be a good idea to add an option that allows to apply the threshold to the HSV colorspace. If someone wants to hack this simple function, please port by_color_select to libgimpcolor and add generic color_distance functions to libgimpcolor. Salut, Sven
