png_set_background 7320 contrib/libtests/pngvalid.c       png_set_background(pp, &back, PNG_BACKGROUND_GAMMA_FILE, expand, 0);
png_set_background 7848 contrib/libtests/pngvalid.c             png_set_background(pp, &dp->background_color, dp->do_background,
png_set_background  201 contrib/visupng/PngFile.c             png_set_background(png_ptr, pBackground, PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
png_set_background  421 example.c            png_set_background(png_ptr, image_background,
png_set_background  424 example.c            png_set_background(png_ptr, &my_background,
png_set_background 1431 png.h          PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr,