netpbm

toolkit for image manipulation

TLDR

Convert JPEG to PPM

$ jpegtopnm [image.jpg] > [image.ppm]

Convert PNG to PPM

$ pngtopam [image.png] > [image.ppm]

Convert PPM to JPEG

$ pnmtojpeg [image.ppm] > [image.jpg]

Resize image

$ pamscale -width [800] [input.ppm] > [output.ppm]

Flip image

$ pamflip -lr [input.ppm] > [output.ppm]

SYNOPSIS

netpbm [tool] [options] [files]

DESCRIPTION

netpbm is a toolkit for image manipulation. It includes many utilities for format conversion.
The tools work with portable bitmap formats. Pipeline-based image processing.

PARAMETERS

TOOL

Specific netpbm utility.

jpegtopnm

Convert JPEG to portable format.

pngtopam

Convert PNG to PAM.

pamscale

Scale images.

pamflip

Flip/rotate images.

--help

Display help information.

CAVEATS

Collection of tools. PNM/PAM intermediate format. Command-line based.

HISTORY

Netpbm evolved from PBMPLUS, a pioneering image manipulation package created by Jef Poskanzer in 1988.