I know what you are saying, however I usually take them to Photo Shop, (it is not the top version by the way) and then use image size on any image i wish to reduce, plus all the others one at a time.
Type in 800 on the wide side the rest is looked after, go to the left of screen to file, top left, and save for web, and your image will be reduced uniformly.
Save to your designated file and there you have it, one can also tweak it a bit to get it to the maximum just under 200kb's
Works really good for me
Leon
