Just loop over the pixels and calculate a gray level through a linear combination of R, G, and B. For example ppmtopgm uses:
grey = .299 r + .587 g + .114 b Then assign the resulting gray to the red, green, and blue components, and voila! You've got yourself a gray scale image. See my previous post for an example of how to loop over a GdkPixbuf. Regards, Dov 2008/12/18 frederico schardong <frede....@gmail.com> > I need some API, which has the power to transform any RGB image to > grayscale (8-bit) and I can map the image, creating a vast array[height in > pixels][width in pixels] in which each cell has a value from 0 to 255, > corresponding to the values of the pixels. > > With gdk-pixbuf can I do that? > _______________________________________________ > gtk-app-devel-list mailing list > gtk-app-devel-list@gnome.org > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list > _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
