The Netpbm image-processing package

These utilities are a public-domain package of fairly basic image-manipulation programs, based on the pbm series of image file formats. There are three types of image format, described in the respective man pages:

• pbm, to represent black-and-white (i.e. binary, or 1-bit) images,
• pgm, to represent 8-bit monochrome (or grey-scale) images, and
• ppm, to represent 24-bit colour images

• image-processing utilities. Some of these will work on any of the formats (see man pnm), while others are specific to one format.
• format conversion utilities, that convert images from pnm format to a selection of other common formats, and vice versa.

• man pnm provides an introduction, and includes references to programs that will work with any of the formats.
• man pbm, man pgm and man ppm give details of the individual formats, together with references to programs that will work with the respective formats.

libraries:

• C++: Support for the pnm formats is built in to the RAVL image processing library.
• C: There is a C library as part of the Netpbm package.