<!DOCTYPE html><html><head><title></title><style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div style="font-family:Arial;">Hi Naïma,</div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">I'm a bit late to the party, but note that the JP2OpenJPEG produces lossy output by default. You need to pass REVERSIBLE=YES and QUALITY=100 as creation options to make it use lossless compression.<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">Laurentiu<br></div><div style="font-family:Arial;"><br></div></body></html>