github.com/roboticscm/goman@v0.0.0-20210203095141-87c07b4a0a55/src/image/png/testdata (about) benchGray.png benchNRGBA-gradient.png benchNRGBA-opaque.png benchPaletted.png benchRGB-interlace.png benchRGB.png invalid-crc32.png invalid-noend.png invalid-trunc.png invalid-zlib.png pngsuite