# png_set_expand_gray_1_2_4_to_8(png_ptr) is the newer name instead of png_set_gray_1_2_4_to_8(png_ptr):
# libpng no longer defines "#define png_sizeof(x) (sizeof (x))"
# png_set_expand_gray_1_2_4_to_8(png_ptr) is the newer name instead of png_set_gray_1_2_4_to_8(png_ptr):
# libpng no longer defines "#define png_sizeof(x) (sizeof (x))"