Quote Originally Posted by gjh42 View Post
Use Photoshop or another image program, and shrink a copy of the original file to the exact pixel size you want for the large image display. Save it as a jpeg of whatever quality you need to look good (more than about 9/12 is usually not distinguishable on the screen), then take the original and shrink it to the medium image pixel display size, and the same for the small image (this will become the "base" image filename).

It doesn't matter how many pixels are in the original file, it can never look better at a certain display size than a copy in the exact pixel display size.
This is exactly how I did all my images. Saving them to jpg at highest quality(which is 12). What step am I missing?