I don't know. I just took a photo reduced it to 80 pixels wide and saved as .jpg. At no compression it was 6.4k and ad 63% compression it was 1.6 k. I haven't been to any seminars on photo shop, however I would like to. I'm still using ver 6 so maybe that is why I have hever heard of meta data in regards to photo shop.

Try file>save for web
You should be able to use a slider to see the effects of compression in real time.

Any how, we both have our avatars up although mine is a little goofy.

Happy fishing.

Peter