png_exp8bit       856 contrib/libtests/tarith.c          double error = png_exp8bit(i) - correct;
png_exp8bit       863 contrib/libtests/tarith.c                   " error: %f\n", i, png_exp8bit(i), correct, error);
png_exp8bit      3698 png.c                      return png_exp8bit(res);