hdtran:but a 500x350 jpeg is pretty safe for a 50K limit BB, and makes a reasonably nice picture in a post.
Can you do the Photoshop correction on top of jpegs, or do you need the RAW file to do it in? .
I usually post 640x480 and 540 longest side on a vertical.
Yes, you can do it on JPEGs - but I wouldn't. Usually I save my image as a psd and work on that (NEVER the original!) as everytime you do something to the JPEG you lose quality.