W3C tech: "PNG has been updated for the first time in 22 years — new spec supports HDR and animation"

"According to ProgramMax, the U.S. Library of Congress, Library and Archives Canada, and the National Archives of Australia recommend PNG for archiving digital images, likely because of its lossless compression. With this amount of trust placed on the file format, it must keep up with the times and ensure that it will continue to help preserve our visual history."

https://tech.yahoo.com/computing/articles/png-updated-first-time-22-145139890.html