num_grays         654 ext/gd/libgd/gdft.c 					level = (bitmap.buffer[pc] * gdAlphaMax / (bitmap.num_grays - 1));
num_grays         715 ext/gd/libgd/gdft.c 				tc_key.pixel = ((bitmap.buffer[pc] * NUMCOLORS) + bitmap.num_grays / 2) / (bitmap.num_grays - 1);