IRFANVIEW will compress most photos/scans down to the desired "size" without having to upload to Photobucket type sites. Handy for a quick posting.
Every time you want to save scan/photo as a
.jpg file it shows this window first...

Set the File Size to 98kb or thereabouts (compression is relative anyway) and it will work here on SCF. Leave it ticked if you have a few scans etc to post and it will do them all at that size.