> I am not sure if I understand your code correctly (I am even more of > a newby), but your code seems to only work on grayscale images. Did > you make sure your image was grayscale before you tested your plug-in > on it? Yes that's it: I had tested with a grayscaled image but it didn't work (a PNG image). I retried with a color image transformed into a grayscaled one and it works (enabled). Now I have to make it run without segfault =). Thanks to all. -- tharibo@xxxxxxx "Le temps ne fait rien à l'affaire, quand on est con, on-est-con !" -- Georges Brassens