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Portable Bitmap (.pbm)

The PBM which is an acronym for Portable Bit-Map is a simple structured monochrome raster image format. It is actually part of Netpbm, an open-source package of graphics programs used in Unix operating systems.
Because of its simple and general design, it's easy to develop programs to convert, manipulate and create the image. The file contents could be either ASCII or binary defined in its simple always ASCII header information.

PBM Specifications

Name Portable Bitmap
File Extension(s) .pbm
Category Raster Images
Use For Sending monochrome bitmap images over email back in the '80s.
Developer Jeffrey A. Poskanzer
MIME Type(s) image/x-portable-bitmap
License N/A
File Sample(s) N/A
Compression None
Max Dimensions N/A
Color Modes
Mode Bits Description
Monochrome 1 In the binary (raw) format, each pixel holds 1-bit of data.
Monochrome 8 In the ASCII (plain) format, each pixel is described by ASCII characters 1 (for back) and 0 (for white).
Animation No
Transparency No
Interlacing No
Metadata No
Layers No
Multipage No