ImageText-based

`image/x-portable-graymap`

PGM (Portable Graymap)

Reference for image/x-portable-graymap, the MIME type for PGM grayscale images in the Netpbm family.

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Expected extensions: .pgm

HTTP Content-Type Header

HTTP Header

Content-Type: image/x-portable-graymap; charset=utf-8

Associated File Extensions

.pgm

Quick Facts

MIME Type	image/x-portable-graymap
Category	Image
Type	Text-based (human-readable)
Extensions	.pgm

Common Usage

PGM stores grayscale images with configurable bit depth. It is used in scientific imaging, medical image processing, computer vision research, and as an intermediate format in image processing pipelines where simplicity is valued over compression.

Code Examples

HTML

<!-- Link or embed with explicit type -->
<link rel="stylesheet" href="file.pgm" type="image/x-portable-graymap">

<!-- Or for script/media elements -->
<script type="image/x-portable-graymap" src="file.pgm"></script>

Node.js

// Express.js
app.get('/file', (req, res) => {
  res.type('image/x-portable-graymap');
  res.send(data);
});

// Node.js http
res.writeHead(200, { 'Content-Type': 'image/x-portable-graymap' });

nginx

# nginx.conf — add to types block or use default
types {
    image/x-portable-graymap  pgm;
}

# Or set for a specific location
location /api/ {
    default_type image/x-portable-graymap;
}