# phpman > man > pnmarith(1) > **TLDR:** This command has been superseded by `pamarith`. > - View documentation for the current command: `tldr pamarith` *Source: tldr-pages* --- [pnmarith(1)](https://www.chedong.com/phpMan.php/man/pnmarith/1/markdown) General Commands Manual [pnmarith(1)](https://www.chedong.com/phpMan.php/man/pnmarith/1/markdown) ## NAME pnmarith - perform arithmetic on two portable anymaps ## SYNOPSIS **pnmarith** **-add**|**-subtract**|**-multiply**|**-difference**|**-minimum**|**-maximum.** _pnmfile1_ _pnmfile2_ ## DESCRIPTION Reads two portable anymaps as input. Performs the specified arithmetic operation, and pro‐ duces a portable anymap as output. The two input anymaps must be the same width and height. The arithmetic is performed between corresponding pixels in the two anymaps, as if maxval was 1.0, black was 0.0, and a linear scale in between. Results that fall outside of [0..1) are truncated. The operator _-difference_ calculates the absolute value of _pnmarith_ _-subtract_ _pnmfile1_ _pnm__‐ _file2,_ i.e. no truncation is done. All flags can be abbreviated to their shortest unique prefix. ## SEE ALSO [pbmmask(1)](https://www.chedong.com/phpMan.php/man/pbmmask/1/markdown), [pnmpaste(1)](https://www.chedong.com/phpMan.php/man/pnmpaste/1/markdown), [pnminvert(1)](https://www.chedong.com/phpMan.php/man/pnminvert/1/markdown), [pnm(5)](https://www.chedong.com/phpMan.php/man/pnm/5/markdown) ## AUTHOR Copyright (C) 1989, 1991 by Jef Poskanzer. Lightly modified by Marcel Wijkstra > 26 August 1993 [pnmarith(1)](https://www.chedong.com/phpMan.php/man/pnmarith/1/markdown)