What is MIME type "image/dng"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

image/dng is the MIME type for the Digital Negative Format (DNG). It stores raw image sensor data captured by digital cameras.
This type bundles image data with metadata. It keeps details like exposure, white balance, and camera settings. It allows more flexibility in adjusting photos later.
Key facts include:

Stores unprocessed image data for high-quality editing
Includes metadata for accurate post-processing
Offers a standardized format to reduce proprietary restrictions
Supports long-term archival of original photo data

Files in this format are used with extensions such as TIF, TIFF, DNG, and PEF.
Software that handles raw files—like Adobe Photoshop or Lightroom—uses this MIME type to optimize image processing and editing work.
For more detailed info, visit Adobe DNG.

Associated file extensions

.tif, .tiff, .dng, .pef

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: image/dng

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="image/dng">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');
    
    http.createServer((req, res) => {
      res.setHeader('Content-Type', 'image/dng');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.tif, .tiff, .dng, .pef

FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.