PNGInterlace     2454 coders/png.c     image->interlace=ping_interlace_method != 0 ? PNGInterlace : NoInterlace;
PNGInterlace     4293 coders/png.c               image->interlace=jng_image_interlace_method != 0 ? PNGInterlace :
PNGInterlace     1111 magick/option.c     { "PNG", PNGInterlace, UndefinedOptionFlag, MagickFalse },