pamfunc

Apply a simple arithmetic function to a Netpbm image. More information: https://netpbm.sourceforge.net/doc/pamfunc.html.

• 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