.PJPG File Extension

Raster image saved in the Progressive JPEG format; encodes the bitmap data so that the image renders in multiple scans from a blurry picture to a sharp image as it is downloaded; allows image viewing programs to show previews before the final image data is received.

The Progressive JPEG format was used by some older Web browsers, such as older versions of Microsoft Internet Explorer. However, now the format is rarely used and supported since communication links are becoming much faster.