Bud,

I am far from an expert, but what Mark has said is correct. Gary will scan his slides at several resolutions, depending on how he intends to use the file. When he scans to print big pictures, he will scan at a very high resolution (dpi) so they will look good when enlarged.

You want to scan to the maximum resolution of whatever you are going to do with the picture. As Mark said, computer monitors display at 72dpi, so you should scan at that resolution. For use on a sight such as this, a JPEG with higher compression is also helpful in that it allows the picture to load faster. We have always asked that folks keep the pictures used here to a size on the longest edge to 500 PIXELS, so they don't overrun the sides of the screen. We have also asked that you try and keep the file size to 100Kb max to allow for reasonable load times. Yes, I'm sure you lose a little something at a lower resolution scan but not that much when it is displayed on our 72dpi monitors.

Dave