What is MIME type "image/x-kiss-cel"?

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

image/x-kiss-cel is a MIME type for a specific image format known as KiSS CEL 4-bit. This format stores images using 4 bits per pixel, which limits the palette to 16 colors.

Retro Graphics: Often seen in legacy applications and older computing systems.
Low-resource environments: Its simple, low-color-depth design is ideal where memory and processing power are constrained.
Specialized applications: Used for game sprites, UI elements, or art preservation that mimics vintage aesthetics.

Files using this format carry the extension CEL. Software that supports image processing uses the MIME type to determine how to properly read and render these images.

This MIME type helps systems quickly identify and handle the unique structure of KiSS CEL images, ensuring compatibility and efficient display.

Associated file extensions

.cel

Usage Examples

HTTP Header

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


    Content-Type: image/x-kiss-cel

HTML

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


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

Associated file extensions

.cel

FAQs

What is the image/x-kiss-cel MIME type used for?

The image/x-kiss-cel MIME type identifies KiSS CEL images, which are 4-bit graphics used primarily in the Kisekae Set System (KiSS). These files usually have a .cel extension and are limited to a 16-color palette, making them common in retro digital paper doll games and legacy graphic applications.

Do web browsers like Chrome or Firefox display .cel files?

No, modern web browsers do not natively support the rendering of image/x-kiss-cel files. To display these images on a webpage, you must convert them to a standard web format like image/png or use a specialized JavaScript library to parse and render the binary data.

How do I configure Apache to serve KiSS CEL files correctly?

You can ensure your Apache server sends the correct headers by modifying your .htaccess or httpd.conf file. Add the line AddType image/x-kiss-cel .cel to map the file extension to the correct MIME type.

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

The x- prefix indicates that image/x-kiss-cel is a non-standard or experimental type that was not formally registered with the IANA at the time of its creation. It is a vendor-specific identifier used to distinguish KiSS files from other image formats.

Are all .cel files associated with image/x-kiss-cel?

Not necessarily; the .cel extension is also used by software like Autodesk Animator and Adobe Photoshop. It is important to verify the file's internal header or context to ensure it is actually a KiSS CEL 4-bit image before assigning the image/x-kiss-cel content type.

How can I view or edit an image/x-kiss-cel file?

You will need specialized software that supports legacy KiSS formats, such as XnView or specific KiSS viewers like KiSS LoaDer. Standard photo editors may not open these files unless a specific plugin for the KiSS format is installed.

What is the difference between image/x-kiss-cel and standard GIFs?

While both formats use indexed color palettes, image/x-kiss-cel is specifically designed for the Kisekae Set System with a strict 4-bit (16 color) limit per layer. Unlike image/gif, CEL files are part of a multi-file set (often paired with KCF configuration files) rather than standalone web images.

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.