pamslice

Extract one line of values out of a PAM image. More information: https://netpbm.sourceforge.net/doc/pamslice.html.

pamslice -row n path/to/image.pam

pamslice -column n path/to/image.pam

pamslice -row n -plane m path/to/image.pam

pamslice -row n -xmgr path/to/image.pam