What is MIME type "application/vnd.3gpp.pic-bw-small"?

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

The MIME type application/vnd.3gpp.pic-bw-small specifies a specialized image format defined by the 3GPP standards. It is built for small, black-and-white images that are efficient to transmit and display, especially in mobile environments.

Its design focuses on minimal color detail and compact file size. This is helpful when data speed and low bandwidth are priorities. It allows mobile devices to render simple graphics quickly.

Mobile Communications: Used in cellular messaging and apps where fast, small image display is needed.
Efficient Graphics: Provides simple icons and thumbnails without taxing system resources.
Standards Compliance: Follows 3GPP guidelines to ensure consistency across mobile platforms.

Files using this MIME type include PSB. For further technical details on MIME types, visit MDN Web Docs on MIME types.

Associated file extensions

.psb

Usage Examples

HTTP Header

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


    Content-Type: application/vnd.3gpp.pic-bw-small

HTML

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


    <a href="file.dat" type="application/vnd.3gpp.pic-bw-small">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', 'application/vnd.3gpp.pic-bw-small');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.psb

FAQs

What is the primary use of the application/vnd.3gpp.pic-bw-small MIME type?

This MIME type is defined by 3GPP standards for transmitting small, black-and-white images over mobile networks. It is primarily used in legacy mobile messaging (MMS) and specific cellular protocols where bandwidth efficiency is critical.

Is an application/vnd.3gpp.pic-bw-small file the same as an Adobe Photoshop Large Document (.psb)?

No. While both share the .psb extension, they are completely different formats. An Adobe PSB file is often gigabytes in size and supports full color, whereas application/vnd.3gpp.pic-bw-small is a tiny, monochromatic format for mobile devices.

Do modern web browsers like Chrome or Firefox support this MIME type?

Generally, no. Most modern desktop browsers do not natively render application/vnd.3gpp.pic-bw-small images. These files are intended for mobile handsets and specific telecommunication software rather than the open web.

How do I configure Apache to serve .psb files with this specific MIME type?

To ensure .psb files are served as 3GPP images rather than Photoshop files, add the following line to your .htaccess file or server config: AddType application/vnd.3gpp.pic-bw-small .psb.

How can I add support for this MIME type in Nginx?

You can define the mapping in your mime.types file or inside a types block in your nginx.conf: types { application/vnd.3gpp.pic-bw-small psb; }.

What should I do if I cannot open a .psb file identified as this MIME type?

First, check the file size; if it is large (MB or GB), it is likely an Adobe file, not a 3GPP image. If it is tiny (bytes or KB), you may need a specialized mobile network emulator or a hex viewer to inspect the binary data.

Why would a developer use this MIME type today?

Usage today is rare and usually limited to maintaining legacy telecommunications systems or interfacing with older hardware that adheres strictly to early 3GPP specifications for MMS content.

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.