Comments (3)
It takes no command-line arguments, and reads the image from from stdin. As with NetPBM-style utilities, you will likely need to combine other utilities to convert to/from the ppm format or do any additional image processing steps that you require.
jpegtopnm capture.jpg | defish-ppm | pnmtojpeg defish.jpg
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By stdin you mean keyboard? that means after running defish-ppm in Ubuntu, type
"jpegtopnm capture.jpg | defish-ppm | pnmtojpeg defish.jpg "?
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No, my command listed above would be the command-line at the unix shell prompt for running it. You will need the NetPBM utilities also installed.
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