png_bKGD          104 contrib/libtests/pngunknown.c #define png_bKGD PNG_U32( 98,  75,  71,  68)
png_bKGD          113 contrib/tools/pngfix.c #define png_bKGD PNG_U32( 98,  75,  71,  68)
png_bKGD          756 pngpriv.h      #define png_bKGD PNG_U32( 98,  75,  71,  68)