What is MIME type "image/x-raw-sigma"?

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

The MIME type image/x-raw-sigma is used for raw image files produced by Sigma digital cameras. It represents unprocessed sensor data that retains full detail for later editing.

Files using this format commonly use the extension X3F, which captures the camera's detailed image information.

High quality data: Keeps full sensor detail for greater flexibility in editing.
Metadata rich: Stores shooting information and camera settings.
Post-processing capability: Enables adjustments like exposure and white balance after capture.

This format is preferred by photographers who demand precise image control and may require special software or plugins to view and edit.

For more technical information on MIME types, visit MIME Types on Wikipedia.

Associated file extensions

.x3f

Usage Examples

HTTP Header

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


    Content-Type: image/x-raw-sigma

HTML

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


    <a href="file.dat" type="image/x-raw-sigma">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/x-raw-sigma');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.x3f

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.