Convert PBM to PGM

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What happens when you convert PBM to PGM?

Multiple source images

Only one image is decoded; a concatenated image sequence is not exported as a complete set.

Two tones in grayscale storage

Black and white source pixels are stored in a grayscale format. This does not recover missing gray levels or colour.

No new colour information

The source stores grayscale or bitonal values. A colour-capable PGM can represent these tones, but conversion cannot infer original scene colours or recover missing intermediate shades. Colourisation would be a separate image-editing operation.

Lossless sample storage

Netpbm stores these samples without compression. Reducing colour, thresholding or changing maxval can still lose information before storage; text and binary representations change the layout, not its image meaning. PGM can store its supported image samples without lossy compression. This applies after rendering and sample conversion: it does not guarantee preservation of source precision, colour space or document structure, and cannot undo earlier losses.

PBM

Source

PBM

Portable Bitmap

Compression: UncompressedTransparency: NoMetadata: Header, Comments

Portable Bitmap: simple uncompressed raster samples for image-processing pipelines.

Explore PBM format →

PGM

Target

PGM

Portable Graymap

Compression: UncompressedTransparency: NoMetadata: Header, Comments

Portable Graymap: simple uncompressed raster samples for image-processing pipelines.

Explore PGM format →

Is PBM → PGM right for you?

Good choice when

PGM fits your delivery use: Grayscale images & masks.
You can choose the source image or part needed for delivery.
You need the two existing tones in a grayscale processing pipeline.
You need the existing gray or binary image in a compatible delivery format.

Probably not when

You require a complete collection, page set or multipart round trip.
You expect reconstruction of intermediate gray levels.
You expect automatic colourisation or reconstruction of absent tones.
You expect lossless encoding to restore lost details or editing structure.

PBM to PGM conversion details

Multiple source images: Only one image is decoded; a concatenated image sequence is not exported as a complete set.
Two tones in grayscale storage: Black and white source pixels are stored in a grayscale format. This does not recover missing gray levels or colour.
No new colour information: The source stores grayscale or bitonal values. A colour-capable PGM can represent these tones, but conversion cannot infer original scene colours or recover missing intermediate shades. Colourisation would be a separate image-editing operation.
Lossless sample storage: Netpbm stores these samples without compression. Reducing colour, thresholding or changing maxval can still lose information before storage; text and binary representations change the layout, not its image meaning. PGM can store its supported image samples without lossy compression. This applies after rendering and sample conversion: it does not guarantee preservation of source precision, colour space or document structure, and cannot undo earlier losses.
Sample precision & colour: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.
Metadata & colour: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.
Compression: PBM: Uncompressed → PGM: Uncompressed PBM: Netpbm stores these samples without compression. Reducing colour, thresholding or changing maxval can still lose information before storage; text and binary representations change the layout, not its image meaning. PGM: Netpbm stores these samples without compression. Reducing colour, thresholding or changing maxval can still lose information before storage; text and binary representations change the layout, not its image meaning.
Colour depth: PBM: 1 bit/pixel → PGM: maxval up to 65535
Dimensions: Rendered image dimensions are retained within the converter limits; this tool does not offer resizing. Orientation handling depends on the source decoder.
Metadata: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.

Common questions

Will every source image be exported?

Only one image is decoded; a concatenated image sequence is not exported as a complete set.

Will PBM to PGM add missing gray shading?

Black and white source pixels are stored in a grayscale format. This does not recover missing gray levels or colour.

Can conversion restore colour or missing shades?

Are bit depth and colour values guaranteed to match?

Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.

Will metadata and colour profiles be retained?