Just a comment about BPG - this is better portable graphics, IMHO not really suitable for archiving. This is 0.9.6 AFAIK not much different from 0.9.7 Using Kubuntu 16.04
Image Encoder version 0.9.6
usage: bpgenc [options] infile.[jpg|png]-b bit_depth set the bit depth (8 to 12, default = 8)
-lossless enable lossless mode
-e encoder select the HEVC encoder (x265 jctvc, default = x265)
-m level select the compression level (1=fast, 9=slow, default = 8)
First thing to note is the limitation on import formats jpg/png, so bit depth at the moment is not too relevant. Then, do you need to worry about the license unless maybe in the USA?
the optional JCTVC HEVC reference encoder is released under the BSD license.
Some of the HEVC algorithms may be protected by patents in some countries
Plenty tests around, but here are mine.
lossless, is a dead loss. Taking a typical jpeg from a digital camera 7.5 MB, lossless = 15 MB
Different matter with default (x265) compression, file size 1.16 MB and with jctv, file size 0.9 MB
What is the trade off, (depends on computer but as a comparison) Encoding speed: x265 took 30 seconds, jctv 2 minutes.
Is it practical. There is a Gimp plugin to load a .bpg file https://i.imgur.com/T12mk0e.jpg but not export one.
