gdImageColorMatch 1717 gd/gd.c        	result = gdImageColorMatch(im1, im2);
gdImageColorMatch  452 gd/libgd/gd.h  int gdImageColorMatch(gdImagePtr im1, gdImagePtr im2);
gdImageColorMatch   56 gd/libgd/gd_compat.h int gdImageColorMatch (gdImagePtr im1, gdImagePtr im2);