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

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

image/x-raw-mamiya marks a raw image file from Mamiya cameras.
It signals that the file holds unprocessed sensor data. This uncompressed data gives photographers greater control over post-processing.

Files with this MIME type use the raw format often seen with MEF.

Maximum detail: Keeps all sensor information for high-quality edits.
Editing flexibility: Allows adjustments like white balance and exposure without loss of quality.
Professional archiving: Ideal for preserving the full dynamic range of photos.

This MIME type helps operating systems and applications identify how to process these specialized image files.
For more on MIME types, check out MDN Web Docs.

Associated file extensions

.mef

Usage Examples

HTTP Header

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


    Content-Type: image/x-raw-mamiya

HTML

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


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

Associated file extensions

.mef

FAQs

What kind of file uses the MIME type image/x-raw-mamiya?

This MIME type is specifically used for Mamiya Electronic Format (MEF) raw image files. It indicates that the file contains unprocessed data directly from a Mamiya camera sensor. You can learn more about the specific extension at mef.

Can web browsers display image/x-raw-mamiya images?

No, standard web browsers like Chrome, Firefox, and Safari do not natively support displaying raw camera files. To show these images on a website, you must convert them to a web-friendly format like image/jpeg or image/png.

How do I open a file with the image/x-raw-mamiya content type?

You need specialized post-processing software such as Adobe Lightroom, Capture One, or Mamiya's proprietary software. Some operating systems may preview the file if the correct raw codec is installed.

How should I configure Nginx to serve .mef files?

You should add the MIME type definition to your mime.types file or specific server block. Use the directive types { image/x-raw-mamiya mef; } to ensure the server sends the correct header to clients.

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

The x- prefix indicates that image/x-raw-mamiya is a non-standard or private MIME type not officially registered with the IANA. While common for Mamiya files, applications rely on this specific string to distinguish it from generic raw types.

What is the difference between image/x-raw-mamiya and image/jpeg?

Files with image/x-raw-mamiya contain uncompressed raw data with high dynamic range, ideal for editing. In contrast, image/jpeg files are compressed and processed, resulting in smaller file sizes but less flexibility for color correction.

I am getting a 404 or download error for .mef files on IIS. How do I fix it?

IIS often blocks unknown file extensions by default for security. You must explicitly add a MIME Map in the IIS Manager: set the file extension to .mef and the MIME type to image/x-raw-mamiya.

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.