PNGInterlace     1794 coders/png.c     image->interlace=ping_interlace_method != 0 ? PNGInterlace : NoInterlace;
PNGInterlace     3486 coders/png.c               image->interlace=jng_image_interlace_method != 0 ? PNGInterlace :
PNGInterlace     1069 magick/option.c     { "PNG", (ssize_t) PNGInterlace, MagickFalse },