Quote Originally Posted by pauland View Post
Jpeg2000 - the Betamax of jpeg formats..
Could not agree more.

The JPG 2000 was never intended to replace the ubiquitous JPG format and the standard has not been updated for 7 years.

For transparency support there is the PNG file format which, IMHO, is better than the lossy JPeg2000 and is equal to the the lossless JPeg2000.