color_quantize   1681 ext/gd/libgd/gd_topal.c       cquantize->pub.color_quantize = prescan_quantize;
color_quantize   1689 ext/gd/libgd/gd_topal.c 	cquantize->pub.color_quantize = pass2_fs_dither;
color_quantize   1691 ext/gd/libgd/gd_topal.c 	cquantize->pub.color_quantize = pass2_no_dither;