Here's the problem. A jpeg "saved for web & devices" in Photoshop at an optimized file size of 2.5 kb ends up increasing in size to about 5 kb on upload to Shopsite.
Now, if I use Yahoo smush.it I reduce the 5.0 kb image to 2.5 kb save it then upload to Shopsite and the file stays at 2.5 kb.
There must be a setting in PS that's adding to the file size. Can anyone shed some light on this problem?