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Portable Pixmap (.ppm)

The PPM which is an acronym for Portable Pix-Map is a simple structured RGB 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.

PPM Specifications

Name Portable Pixmap
File Extension(s) .ppm
Category Raster Images
Use For Easily exchange binary images between platforms back in the '80s.
Developer Jeffrey A. Poskanzer
MIME Type(s) image/x-portable-pixmap
License N/A
File Sample(s) N/A
Compression None
Max Dimensions N/A
Color Modes
Mode Bits Description
Grayscale N/A PPM has no distinct grayscale mode.
True color 8 Each pixel is described by the red, blue, and green color components, each of which is 8 bits.
Indexed color N/A PPM has no distinct indexed color mode.
Grayscale with alpha N/A PPM does not support an alpha channel.
True color with alpha N/A PPM does not support an alpha channel.
Animation No
Transparency No
Interlacing No
Metadata No
Layers No
Multipage No