Better Portable Grapgics is a new image format to
replace JPEG when quality or size is an issue. It
has high compression ratio and supported by most web
browsers with small javascript decoder.It is based on
the subset of HEVC Open Video Compression Standard.

An HTML demonstration is available
in /usr/doc/libbpg-0e2aadb_20180428/html/index.html
you can access it by using the Falkon web browser or
using chrome with --allow-file-access-from-files option

The BPG file format is specified in
/usr/doc/libbpg-0e2aadb_20180428/doc/bpg_spec.txt.

This is an optional dependency for VLC media player.
It is supported only on 64-bit platforms only.