PGM

PGM Image

PGM (Portable Graymap) is a simple grayscale image format designed for easy exchange and processing of bitmap graphics.

What is PGM Image?

The PGM format is part of the Netpbm project, created to standardize simple image types. It stores grayscale image data in either plain text (ASCII) or binary formats, making it exceptionally straightforward to read and manipulate using basic programming languages and scripts.

Advantages

Simple structure that is easy to parse programmatically
No complex compression algorithms required
Supports both plain text and efficient binary representations
Platform-independent and widely supported by scientific tools

Limitations

Uncompressed files result in large file sizes
Limited strictly to grayscale color depth
Lacks advanced metadata support

How to open PGM Image files

GIMP IrfanView ImageMagick XnView Photoshop

Common use cases

Computer vision and image processing research
Storing heightmaps in 3D graphics and game development
Processing scientific and medical grayscale scans
Educational purposes in programming courses

Convert PGM files

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Explore other formats

FLAC Audio File WMA audio file EPS Image 7Z Compressed Archive XLSX Spreadsheet WMV Video TAR Archive CorelDRAW Image File (.cdr) KDC Image Canon Raw Image File HyperText Markup Language file PNG Image

Frequently asked questions

PGM stands for Portable Graymap, which is part of the Netpbm graphics format family.

You can open PGM files using standard image editors like GIMP, IrfanView, ImageMagick, and XnView.

Usually, PGM files are uncompressed, which keeps their structure simple but results in relatively large file sizes.

No, PGM is strictly for grayscale images. For color images, the related PPM (Portable Pixmap) format is used.