File Extension PJG

.PJG File

File extension: PJG
File type: Lossless JPEG Compression (JIFIF Complient)

Notes about the PJG file extension:

To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The PJG file type is primarily associated with 'packJPG' by Hochschule Aalen.

From 2004 to 2008, new research has emerged on ways to further compress the data contained in JPEG images without modifying the represented image.

A freely-available tool called packJPG is said to do this and is based on the 2007 paper Improved Redundancy Reduction for JPEG Files.

Extracting PJG files produces the original JPEG file bitwise depending on options chosen. However they act as a solid archive and may not be directly viewable. A plug-in for XnView exists.

Detailed information for file extension PJG:

Primary association: packJPG
Company: Hochschule Aalen
File classification: Graphic
Related links: Wikipedia JPEG Lossless Compression Info, XnView Plug-in List/Links

Other applications associated with file type PJG:

  • Photo Assistant (Image)Photo Shops use this format so the customers only can reprint photos in the shop. This association is classified as Graphic.

To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

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