pamfunc
Apply a simple arithmetic function to a Netpbm image.
TLDR
Apply the specified arithmetic function with n as the second argument to each sample in the specified PAM image
$ pamfunc -[multiplier|divisor|adder|subtractor|min|max] [n] [path/to/input.pam] > [path/to/output.pam]
Apply the specified bit string function with n as the second argument to each sample in the specified PAM image
$ pamfunc -[andmask|ormask|xormask|shiftleft|shiftright] [n] [path/to/input.pam] > [path/to/output.pam]
