png_set_bKGD      169 contrib/gregbook/writepng.c         png_set_bKGD(png_ptr, info_ptr, &background);
png_set_bKGD     2087 png.h          PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr,
png_set_bKGD     1946 pngrutil.c        png_set_bKGD(png_ptr, info_ptr, &background);
png_set_bKGD     1161 pngtest.c               png_set_bKGD(write_ptr, write_info_ptr, background);