Re-compression after metadata-changes?

[zips]

Does XnView actually save/recompress the whole image-file while saving changed meta-data (IPTC/EXIF etc.) ??? - Or does it write/edit metadata without opening/resaving the jpg-files?

answer from xnview (Pierre - Author of XnView), 2008-03-27:

If you are in browser mode, it's lossless.