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OUTPUTFORMAT
    NAME 'png'
    DRIVER AGG/PNG
    IMAGEMODE RGBA
    EXTENSION "png"
    MIMETYPE "image/png"
    TRANSPARENT ON
    FORMATOPTION "QUANTIZE_FORCE=ON"
    FORMATOPTION "QUANTIZE_DITHER=OFF"
    FORMATOPTION "QUANTIZE_COLORS=256"
    FORMATOPTION "INTERLACE=OFF"
END