Camera RAW: Digital Negatives & DNG Standards
Bayer sensor data, uncompressed dynamic range, and digital negatives.
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Format Comparison & Technical Specifications
| Output Format | MIME Type | Specification | Type |
|---|---|---|---|
| DNG Adobe | image/x-adobe-dng | ADOBE-DNG-SPEC | Digital Negative RAW Format |
| CR2 Canon | image/x-canon-cr2 | CANON-CR2-SPEC | Canon EOS RAW Version 2 |
| NEF Nikon | image/x-nikon-nef | NIKON-NEF-SPEC | Nikon Electronic Format RAW |
| ARW Sony | image/x-sony-arw | SONY-ARW-SPEC | Sony Alpha Camera RAW |
| RW2 Panasonic | image/x-panasonic-rw2 | ADOBE-DNG-SPEC | Panasonic Lumix Camera RAW |
| JPG Processed JPEG | image/jpeg | ITU-T-T81-JPEG | Standard Export JPEG |
| PNG Processed | image/png | W3C-PNG | Lossless Export PNG |
Technical Specifications & Codec Breakdown
Why Camera RAW is Not an Image Yet
A RAW file is not a viewable image: it is raw sensor voltage measurements captured behind a Bayer color filter. Software must 'develop' (demosaic) the raw data, letting photographers adjust exposure and white balance after shooting with zero quality loss.
Adobe DNG: Protecting RAW Photos From Obsolescence
Camera manufacturers invent new proprietary RAW extensions (CR3, NEF, ARW) with every camera model. Adobe DNG (Digital Negative) is an open standard that preserves full raw sensor data, guaranteeing photos remain readable decades into the future.
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