Rebecca,
A few things to keep in mind. For a normal, non panoramic photo, you want to make sure that the neither the image height or image width exceeds 850 pixels. If either width or height exceeds 850 pixels the server will once again rescale the image down to those maximums and you may loose some more quality.
That being said, as the other articles mention you want to reduce the images in steps. For example you have a large image out of the camera or scanner, for example a 3000x2000 pixel image. Do not reduce it in one step directly from the 3000 width to 850 width, you will loose too much information. I do it in steps the first reduction is from 3000 to 2500, then from 2500 to 2000, then from 2000 to 1500, then from 1500 to 1000 then from 1000 to the final width of 850. You can lightly apply unsharp mask to each step if you wish, but for sure you will want to add it to the final step. Save the final reduced image as a jpg using the medium to high quality level while keeping the file size under the site maximum. Remember some people are still on slow dial up lines and may not wait for a 300k - 400k image to load. So try to keep the file size smaller if you can using the quality level control in your jpg save program.
This process while taking a bit more effort will ultimately give you a better looking reduction with the most information.
Phil
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