gdImageColorClosest 2871 ext/gd/gd.c    	RETURN_LONG(gdImageColorClosest(im, red, green, blue));
gdImageColorClosest 2334 ext/gd/libgd/gd.c 						nc = gdImageColorClosest(dst, ncR, ncG, ncB);
gdImageColorClosest  512 ext/gd/libgd/gd.h int gdImageColorClosest(gdImagePtr im, int r, int g, int b);
gdImageColorClosest  304 ext/gd/libgd/gdtest.c   foreground = gdImageColorClosest (im, 0, 0, 0);