pamdeinterlace
Remove every other row in a Netpbm image.
TLDR
Produce an image consisting of the input's even-numbered rows
$ pamdeinterlace [path/to/image.ppm] > [path/to/output.ppm]
Produce an image consisting of the input's odd-numbered rows
$ pamdeinterlace -takeodd [path/to/image.ppm] > [path/to/output.ppm]
