pamsplit
splits a multi-image PAM/PNM stream into separate files
TLDR
Split a multi-image PAM/PNM stream into numbered files
$ pamsplit [input.pam] "[image%d.pam]"
Pad the sequence number to a fixed width$ pamsplit -padname [4] [input.pam] "[image%d.pam]"
Use default filenames (image0.pam, image1.pam, ...)$ pamsplit [input.pam]
Read from stdin while writing numbered outputs$ cat [stream.pnm] | pamsplit - "[frame%d.pnm]"
SYNOPSIS
pamsplit [-padname digits] [inputfile] [outputpattern]
DESCRIPTION
pamsplit reads a Netpbm stream that contains multiple concatenated PAM, PNM, PBM, PGM, or PPM images and writes each image to a separate file. The output filenames are generated from a printf-style pattern that includes a %d for the image index.The tool is the inverse of pnmcat / pamcat and is part of the Netpbm package.
PARAMETERS
inputfile
Multi-image PAM/PNM input file. Use - or omit to read from stdin.outputpattern
Output filename pattern containing a single %d which is replaced with the (zero-based) image index. Defaults to image%d.-padname digits
Pad the sequence number with leading zeros to at least digits characters (so -padname 3 produces image000, image001, ...). Useful for ensuring lexicographic ordering of output files.
INSTALL
sudo apt install netpbm
sudo dnf install netpbm
sudo pacman -S netpbm
sudo apk add netpbm
sudo zypper install netpbm
brew install netpbm
nix profile install nixpkgs#netpbm
CAVEATS
The output pattern must contain exactly one %d specifier. Existing files at the generated paths are silently overwritten. For PBM/PGM/PPM streams without alpha channels, pamsplit preserves the original format of each frame.
HISTORY
pamsplit is part of the Netpbm package by Bryan Henderson and others, and supersedes the older pnmsplit utility from PBMplus.