What is MIME type "image/jls"?

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

image/jls is the MIME type used for files that follow the JPEG-LS compression standard.
It delivers both lossless and near-lossless image compression, which means it can retain all original details or allow very little quality change for smaller file sizes.
Files using this standard typically have the JLS extension.
It is designed for systems that need high fidelity and fast decompression.

Lossless Compression: Keeps every detail intact, ideal for critical imaging.
Near-lossless Compression: Slight quality trade-off for better compression ratios.
Medical Imaging: Ensures precision when image accuracy is vital.
Digital Archiving: Preserves images over long periods without degradation.

This format is favored in technology and specialized fields where image integrity is paramount.
For further reading, check out external resources like JPEG-LS on Wikipedia.

Associated file extensions

.jls

Usage Examples

HTTP Header

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


    Content-Type: image/jls

HTML

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


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

Associated file extensions

.jls

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.