For example, if we want to take an image, scale it to 600 x 600, make it a bit transparent, and composite it over a white and gray checkerboard pattern, we could do this: alloc('white'); $c2 = $cmap->alloc('gray50'); $pixbuf = $pixbuf->composite_color_simple(600, 600, GDK_INTERP_BILINEAR, 230, 8, $c1->pixel, $c2->pixel); ?>]]>