Binary package “libmng2” in ubuntu focal
Multiple-image Network Graphics library
The libmng library supports decoding, displaying, encoding, and various other
manipulations of the Multiple-image Network Graphics (MNG) format image files.
It uses the zlib compression library, and optionally the JPEG library by the
Independent JPEG Group (IJG) and/or lcms (little cms), a color-management
library by Marti Maria Saguar.