# What is a RAW File?

A RAW file contains minimally processed measurements from a camera sensor plus metadata needed to interpret them. It is not a single universal layout, and camera vendors may use different formats.

Encoded media + metadata

File format

Portable file

A file format defines how encoded content and metadata are organized for storage or exchange. This diagram shows file formats & compression broadly, not specifically RAW Files.

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## How RAW Files work

A camera RAW file packages sensor-derived samples with the calibration and capture metadata required to turn them into a viewable image. For color-filter-array sensors, development includes black-level correction, demosaicing, white balance, color transformation, and tone mapping, each of which can change the rendered result. RAW therefore functions as a source master in an imaging workflow, while previews and standardized exports serve selection, editing interchange, and delivery.

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## Key facts

1. 1RAW does not necessarily mean uncompressed. Vendor formats may use lossless or lossy compression while still preserving sensor-oriented data for a later development process.
2. 2A camera-generated preview can differ from a fresh RAW conversion because it reflects the camera’s picture style, white balance, and rendering software at capture time.
3. 3Correct development depends on model-specific metadata such as sensor layout and black levels. A decoder may open older files yet fail or misrender samples from a newer camera model.

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## When RAW Files matter

Retain RAW input when an imaging workflow needs greater latitude over demosaicing, exposure, dynamic range, or color. Distribution requires development into a broadly supported format, and decoder compatibility varies by camera.

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## Common use cases for file formats & compression

These examples cover file formats & compression broadly, not specifically RAW Files.

* Accepting heterogeneous uploads while producing a controlled set of delivery formats.
* Moving assets between cameras, editors, browsers, archives, and downstream APIs.
* Separating long-lived source files from compact derivatives optimized for a particular channel.

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## Working with file formats & compression

This guidance covers file formats & compression broadly, not just RAW Files.

A parser reads the file structure, identifies contained streams and metadata, and exposes them to a decoder or application. Conversion usually decodes the source representation and writes compatible information into a different structure or encoding.

This category covers file and bitstream formats, their structures, and the compression methods they use. A filename extension can be misleading, so evaluate the detected format, decoding support, metadata, transparency, color, timing, patents, and archival needs before choosing an output.

### What you gain

* A suitable format preserves the properties a workflow actually needs.
* Standardized structures allow files to move between compatible tools and systems.
* Format conversion can improve delivery size, editability, or long-term accessibility.

### What it costs

* Modern formats can save bandwidth but may need fallbacks for older clients and production tools.
* Converting to a simpler format can discard transparency, animation, metadata, color precision, or editability.
* Archival suitability, browser support, and editing support often favor different choices.

### Before production

1. 1Inspect the detected container, codec, MIME type, and magic bytes instead of trusting a suffix.
2. 2Verify decoder support and preserve metadata, color, transparency, or timing when required.
3. 3Retain the source when the chosen delivery format is lossy or tied to current software.

[← Rate-Distortion Optimization](/glossary/rate-distortion-optimization.md)[Real-Time Video →](/glossary/real-time-video.md)

More in file formats & compression

* [PPM File](/glossary/ppm-file.md)
* [Radiance HDR](/glossary/radiance-hdr.md)
* [Raster Files](/glossary/raster-files.md)
* [RIFF File](/glossary/riff-file.md)
* [RMVB](/glossary/rmvb.md)
* [SRT File](/glossary/srt-file.md)

[All 505 terms](/glossary.md)

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