ditherFlag        163 ext/gd/gd.c    	ZEND_ARG_INFO(0, ditherFlag)
ditherFlag        564 ext/gd/libgd/gd.h gdImagePtr gdImageCreatePaletteFromTrueColor (gdImagePtr im, int ditherFlag, int colorsWanted);
ditherFlag        566 ext/gd/libgd/gd.h void gdImageTrueColorToPalette(gdImagePtr im, int ditherFlag, int colorsWanted);