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RosettaCodeData/Task/Bitmap-Read-a-PPM-file/J/bitmap-read-a-ppm-file-2.j

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myimg=: readppm jpath '~temp/myimg.ppm'
myimgGray=: toColor toGray myimg
myimgGray writeppm jpath '~temp/myimgGray.ppm'
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