What is MIME type "image/x-hasselblad-3fr"?

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-hasselblad-3fr designates raw image files produced by Hasselblad cameras. These images capture unprocessed sensor data and store detailed metadata. The format uses the extension 3FR.

This format is favored in professional photography for its ability to preserve maximum detail. It allows extensive control during post-processing, offering a wide dynamic range and precise color adjustments.

Main Use: Capturing high-resolution, unprocessed images from Hasselblad medium format cameras.
Editing: Providing extensive image data for advanced post-production corrections.
Metadata: Retaining camera settings, exposure details, and color profiles.
Archival: Ensuring long-term preservation of image quality and details.

Learn more at the Hasselblad official website.

Associated file extensions

.3fr

Usage Examples

HTTP Header

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


    Content-Type: image/x-hasselblad-3fr

HTML

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


    <a href="file.dat" type="image/x-hasselblad-3fr">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-hasselblad-3fr');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.3fr

FAQs

Do web browsers support image/x-hasselblad-3fr?

No, standard web browsers like Chrome, Firefox, and Safari do not natively display image/x-hasselblad-3fr files. Because these are raw camera files containing unprocessed sensor data, they must be converted to web-friendly formats like image/jpeg or image/png before being displayed on a webpage.

How do I configure Apache to serve .3fr files correctly?

To ensure your Apache server sends the correct Content-Type header, add the following line to your .htaccess file or main configuration: AddType image/x-hasselblad-3fr .3fr. This prevents browsers from misinterpreting the file as a generic binary stream.

What software can open files with the image/x-hasselblad-3fr MIME type?

The primary software for this MIME type is Hasselblad's proprietary Phocus software. However, industry-standard tools like Adobe Lightroom and Adobe Photoshop (via Camera Raw) also support opening and editing 3fr files.

Why does this MIME type start with 'x-'?

The x- prefix in image/x-hasselblad-3fr indicates that it is a non-standard or proprietary MIME type. It is not registered in the official IANA standards tree, identifying it specifically as a vendor-specific format for Hasselblad cameras.

What is the difference between image/x-hasselblad-3fr and image/jpeg?

The image/x-hasselblad-3fr format contains uncompressed raw data directly from the camera sensor, offering maximum flexibility for editing exposure and color. In contrast, image/jpeg is a compressed format that discards data to save space, making it better for display but worse for heavy editing.

How do I fix Nginx download errors for .3fr files?

If Nginx forces a download or sets the wrong type, update your mime.types file to include the definition: image/x-hasselblad-3fr 3fr;. Reload Nginx to apply the changes, ensuring the server identifies the file correctly to the client.

General 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.