Thanks again for all the discussion, especially about the what came first the chicken-before or the chicken-after.
Basically, I have been 'guaranteed' the before (320x240) is the real before and the after (640x480) is really the after. The reason, the real estate board only sends out the 320x240 ...
Snibgo: interesting idea...currently the photos are coming from a real agent via a feed. We have been told the restrictions are 320x240 maximum but the the 'after.jpg' is 640x480!
So, we assume the after.jpg must have come from come from the 320x240 image.
After a day and a half of reading, testing, trying I am turning to the community for some help. I am stumped, thought I was getting close but at this point I am just guessing. And it seems this has been solved many times before.
PROBLEM: trying to increase a JPG file from 320x240 to ...