JNG

JNG (JPEG Network Graphics) is an image file format. It encapsulates a JPEG datastream, and adds support for transparency.

It is essentially the lossy-compression counterpart to PNG. It was developed so that MNG could use it as a building block.

Identification
Files begin with.

Specifications

 * JNG 1.0

Software

 * Konvertor
 * ImageMagick
 * libmng
 * abydos

Sample files

 * https://telparia.com/fileFormatSamples/image/jng/