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RosettaCodeData/Task/Bitmap-Read-a-PPM-file/Haskell/bitmap-read-a-ppm-file-2.hs

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main =
(readNetpbm "original.ppm" :: IO (Image RealWorld RGB)) >>=
stToIO . (toRGBImage <=< toGrayImage) >>=
writeNetpbm "new.ppm"
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