png_set_rgb_to_gray_fixed(rd->png_ptr, 1, 21267, 71514);
if (!(io->flags & IMAGE_ALPHA))
if (io->flags & IMAGE_IO_USE_BACKGROUND)
png_set_rgb_to_gray_fixed(rd->png_ptr, 1, 21267, 71514);
if (!(io->flags & IMAGE_ALPHA))
if (io->flags & IMAGE_IO_USE_BACKGROUND)