png_get_hIST      491 example.c               png_get_hIST(png_ptr, info_ptr, &histogram);
png_get_hIST     2154 png.h          PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr,
png_get_hIST     1169 pngtest.c            if (png_get_hIST(read_ptr, read_info_ptr, &hist))