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pammixinterlace

Merge each row in an image with its two neighbours. See also: pamdeinterlace. More information: https://netpbm.sourceforge.net/doc/pammixinterlace.html.

Merge each row in an image with its two neighbours:

pammixinterlace {{path/to/image.ppm}} > {{path/to/output.ppm}}

Use the specified filtering mechanism:

pammixinterlace -filter {{linear|fir|ffmpeg}} {{path/to/image.ppm}} > {{path/to/output.ppm}}

Turn on adaptive filtering mode, i.e., only modify pixels that are obviously part of a comb pattern:

pammixinterlace -adaptive {{path/to/image.ppm}} > {{path/to/output.ppm}}