Convert PDF to PGM

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What happens when you convert PDF to PGM?

Page rendering

One page is converted (default: page 1). Choose another page in Advanced options.

Grayscale output

Colour is converted to grayscale using linear-sRGB luminance and the sRGB transfer curve. Colour channels and transparency are not retained.

Opaque output

Transparency is replaced with white by default. Change the background in Advanced options.

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.

PDF

Source

PDF

Portable Document Format

Compression: Depends on variantTransparency: YesMetadata: Document information, XMP, ICC output intents

A fixed-page document format mixing text, vectors and raster images. Image conversion requires deliberate page rendering.

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PGM

Target

PGM

Portable Graymap

Compression: UncompressedTransparency: NoMetadata: Header, Comments

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

Explore PGM format →

Is PDF → PGM right for you?

Good choice when

PGM fits your delivery use: Grayscale images & masks.
You need a raster preview of a document page.
Your processing pipeline explicitly needs grayscale samples.
An opaque image is acceptable for your destination.

Probably not when

Selectable text, vector objects or document navigation must remain.
Colour distinctions carry information you need to retain.
You need cutouts or translucent edges for compositing.
You expect lossless encoding to restore lost details or editing structure.

Conversion considerations

PDF-to-image conversion renders a page composition at a selected pixel resolution. Text, vectors and interactions become pixels; this is different from extracting an embedded image. Page selection, crop, fonts, background and resolution are not defined by the future converter yet.
PGM stores one grayscale sample per pixel, with no colour channels or alpha. Colour input becomes gray; brightness depends on the colour transform and transfer-function handling chosen by the future engine. Higher maxval can retain more gray levels, but does not retain chromatic information.
If PDF contains transparency, PGM cannot retain it as transparent output areas. Those pixels need compositing against an opaque background. Matte colour, alpha interpretation and edge treatment are future engine decisions; no background colour is selected yet.

PDF to PGM conversion details

Page rendering: One page is converted (default: page 1). Choose another page in Advanced options.
Grayscale output: Colour is converted to grayscale using linear-sRGB luminance and the sRGB transfer curve. Colour channels and transparency are not retained.
Opaque output: Transparency is replaced with white by default. Change the background in Advanced options.
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: PDF: Depends on variant → PGM: Uncompressed PDF: PDF has no single compression quality. Different streams may use lossless or lossy filters; page rasterization can remove document structure even when the resulting pixels are encoded losslessly. 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.
Transparency: Transparency is replaced with white by default. Change the background in Advanced options.
Colour depth: PGM: maxval up to 65535
Multiple images: PDF: Page tree
Vector graphics: PDF: Paths & text on pages
Dimensions: One page is converted (default: page 1). Choose another page in Advanced options.
Metadata: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.

Common questions

Is PDF conversion the same as image extraction?

One page is converted (default: page 1). Choose another page in Advanced options.

Will PGM keep the source colours?

Colour is converted to grayscale using linear-sRGB luminance and the sRGB transfer curve. Colour channels and transparency are not retained.

What happens to transparent areas?

Transparency is replaced with white by default. Change the background in Advanced options.

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?