A camera RAW file stores sensor-derived image data and capture metadata before a camera or editor renders the picture as a finished color image. “RAW” is a category of camera formats, not one universal file type: compatibility depends on the camera model, file extension and software.
What is a RAW file?
Adobe defines a camera RAW file as containing “unprocessed, uncompressed grayscale picture data from a digital camera’s image sensor, along with information about how the image was captured (metadata).” Adobe’s Camera Raw documentation explains that software uses the sensor data and metadata to construct and process a color image.
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That definition describes the basic idea; it does not mean every camera maker stores data in exactly the same way. RAW files commonly need a RAW processor to interpret the sensor samples and render a viewable image. The original data remains available for later interpretation and adjustment, much like a photographic negative.
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A JPEG is processed in-camera into a ready-to-view image and compressed. A RAW file gives an editor more latitude to make later processing decisions because it retains sensor-derived data for interpretation. That flexibility is not a guarantee that a RAW photo will look better: the result depends on the capture and how the image is rendered.
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| Choice | What you get | Trade-off |
|---|---|---|
| RAW | More control over later image processing. | Requires compatible software to interpret and render the file; storage needs and compatibility depend on the camera and format. |
| JPEG | A camera-processed image that is ready to view and widely convenient to use. | Less latitude for changing the camera’s processing decisions later. |
Why won’t my RAW file open?
RAW is not one standardized extension shared by every camera. Manufacturers have used different, sometimes proprietary formats, and support can vary by camera model. The Library of Congress describes camera RAW as a group of proprietary formats and notes that some formats use encrypted data that requires manufacturer software; this does not apply to every RAW file. See its Camera Raw Formats overview.
- Find the camera model and the file’s exact extension.
- Check the editing application’s supported-camera list for that model and file type.
- If the editor does not support it, try the camera maker’s software or check whether Adobe’s DNG Converter supports the file.
Adobe says its DNG Converter supports files from more than 600 cameras, but that is Adobe’s stated count, not a guarantee for every model. Check the current DNG Converter compatibility information for your camera.
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What is the difference between RAW and DNG?
DNG stands for Digital Negative. Adobe introduced the format specification in 2004 as a way to address the spread of camera-specific RAW formats. Adobe describes DNG as publicly documented and non-proprietary. The Federal Agencies Digitization Guidelines Initiative describes it as a wrapper for camera sensor data and metadata used to reconstruct, adjust and display an image, based on TIFF/EP; see its DNG glossary entry.
| Aspect | Camera-native RAW | DNG |
|---|---|---|
| Format | Often camera-maker-specific; implementation can vary by maker and model. | A publicly documented format intended to store camera RAW data. |
| Software support | Depends on whether software supports that camera and file type. | Adobe says hundreds of software makers support DNG; compatibility still depends on the application. |
| Purpose | Retains the camera’s original RAW file and its implementation-specific information. | Stores RAW data for later image reconstruction and processing; it is not a finished JPEG export. |
| Conversion | No conversion is needed if your chosen software supports the file. | Requires conversion from a supported camera file when you choose to use DNG. |
Adobe’s current documentation lists the DNG 1.7.1.0 specification, dated September 2023, and identifies Photoshop, Photoshop Elements, Lightroom and Lightroom Classic as DNG-compatible applications. Adobe also says some camera manufacturers support DNG directly. These details are described in its DNG and DNG Converter documentation.
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Do I need to convert RAW to DNG?
No. Convert only if DNG suits your editing or preservation workflow, or if a compatible DNG file helps you use software that cannot open the camera-native file. Adobe offers a free DNG Converter for supported camera RAW files. Conversion is optional, not a requirement for editing every RAW photo.
- First check whether your editor supports the exact camera model and file extension.
- If it does not, check the camera maker’s converter and Adobe’s DNG Converter compatibility list.
- If you convert, keep the original camera file when you want to retain the untouched source and any camera-specific data.
DNG’s public documentation may help with cross-software use and preservation, but it cannot guarantee that future software will always support the format. The Library of Congress notes preservation risks in proprietary formats; that does not make conversion necessary for every photographer.
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