Kodak RAW to PGM: conversion guide

Source · Kodak RAW
Target · PGM

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What happens when you convert Kodak RAW to PGM?

RAW development

Kodak RAW needs camera- and file-aware development to produce a rendered PGM image. White balance, exposure, camera colour interpretation and, where applicable, demosaicing determine that rendering. The destination does not retain the original RAW development latitude. No development settings or camera support are implemented yet.

Grayscale output

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.

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.

Kodak RAW

Source

Kodak RAW

Kodak Digital Camera Raw (DCR / KDC)

Compression: Depends on variantTransparency: NoMetadata: Capture metadata

A registry group for Kodak DCR and KDC raw images, with decoding requirements specific to the camera.

Explore Kodak RAW 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 Kodak RAW → PGM right for you?

Good choice when

  • PGM fits your delivery use: Grayscale images & masks.
  • You need a developed image for a non-RAW application.
  • Your processing pipeline explicitly needs grayscale samples.
  • You need lossless storage of the rendered samples supported by PGM.

Probably not when

  • You need the original sensor data and freedom to redevelop it.
  • Colour distinctions carry information you need to retain.
  • You expect lossless encoding to restore lost details or editing structure.
  • You require identical samples without a defined colour and precision policy.

Kodak RAW to PGM conversion details

RAW development
Kodak RAW needs camera- and file-aware development to produce a rendered PGM image. White balance, exposure, camera colour interpretation and, where applicable, demosaicing determine that rendering. The destination does not retain the original RAW development latitude. No development settings or camera support are implemented yet.
Grayscale output
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.
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
Source and target sample models can differ in precision, channel layout, colour space and transfer function. Lossless compression only preserves the samples actually encoded; a precision reduction or colour conversion can already change them. The future engine defines numeric mapping, orientation and colour conversion; canonical depth facts are listed below where available.
Metadata & colour
Format support does not guarantee that an export preserves metadata or colour profiles. Retention and colour handling depend on the future converter; its engine is not implemented yet.
Compression
Kodak RAW: Depends on variant → PGM: Uncompressed Kodak RAW: ExifTool and LibRaw document DCR/KDC recognition and camera support. They do not justify one global bit depth or compression claim across both extensions. Treat the registry group as navigation identity while retaining the actual file type and model for processing. 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
Kodak RAW: Camera and recording mode → PGM: maxval up to 65535
Sensor data
Kodak RAW: Raw development required
Dimensions
Pixel dimensions, page geometry, rendering resolution, resizing and orientation need explicit converter policies. The future engine has not defined them yet.
Metadata
Kodak RAW: Capture metadata → PGM: Header, Comments. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.

Common questions

Will PGM still be an editable camera RAW?

Kodak RAW needs camera- and file-aware development to produce a rendered PGM image. White balance, exposure, camera colour interpretation and, where applicable, demosaicing determine that rendering. The destination does not retain the original RAW development latitude. No development settings or camera support are implemented yet.

Will PGM keep the source colours?

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.

Does lossless output mean an unchanged source?

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.

Are bit depth and colour values guaranteed to match?

Source and target sample models can differ in precision, channel layout, colour space and transfer function. Lossless compression only preserves the samples actually encoded; a precision reduction or colour conversion can already change them. The future engine defines numeric mapping, orientation and colour conversion; canonical depth facts are listed below where available.

Will metadata and colour profiles be retained?

Kodak RAW: Capture metadata → PGM: Header, Comments. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.