.JNG File Extension
What is a JNG file?
Image file format related to the .PNG format, but uses lossy compression like standard .JPG files; developed as a sub-format for .MNG objects, but can also be used as a standalone raster image format.
JNG files may include an optional alpha channel for transparency (which is not supported by standard JPEG files). They may also include ancillary data chunks that can contain color-space information and comments.