Man page or keyword search:   man All Sections 1 - General Commands 2 - System Calls 3 - Subroutines, Functions 4 - Special Files 5 - File Formats 6 - Games and Screensavers 7 - Macros and Conventions 8 - Maintenence Commands 9 - Kernel Interface New Commands Server 4.4BSD AIX Alpinelinux Archlinux Aros BSDOS BSDi Bifrost CentOS Cygwin Darwin Debian DigitalUNIX DragonFly ElementaryOS Fedora FreeBSD Gentoo GhostBSD HP-UX Haiku Hurd IRIX Inferno JazzOS Kali Knoppix LinuxMint MacOSX Mageia Mandriva Manjaro Minix MirBSD NeXTSTEP NetBSD OPENSTEP OSF1 OpenBSD OpenDarwin OpenIndiana OpenMandriva OpenServer OpenSuSE OpenVMS Oracle PC-BSD Peanut Pidora Plan9 QNX Raspbian RedHat Scientific Slackware SmartOS Solaris SuSE SunOS Syllable Tru64 UNIXv7 Ubuntu Ultrix UnixWare Xenix YellowDog aLinux   6284 pages apropos Keyword Search (all sections) Output format html ascii pdf view pdf save postscript

pnmarith(1)					   pnmarith(1)

NAME
       pnmarith - perform arithmetic on two portable anymaps

SYNOPSIS
       pnmarith -add|-subtract|-multiply|-difference	pnmfile1
       pnmfile2

DESCRIPTION
       Reads two portable anymaps as input.  Performs the  speci-
       fied  arithmetic operation, and produces 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 pnmfile2, i.e. no truncation
       is done.

       All flags can be abbreviated to their shortest unique pre-
       fix.

SEE ALSO
       pbmmask(1), pnmpaste(1), pnminvert(1), pnm(5)

AUTHOR
       Copyright  (C) 1989, 1991 by Jef Poskanzer.  Lightly modi-
       fied by Marcel Wijkstra <wijkstra@fwi.uva.nl>

			  26 August 1993			1

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 

Vote for polarhome