|As you should already know,
a thumbnail is a smaller image of it's bigger image. This is so
you can see multple images at once, quickly, without having to open each
single image to see what it looks like. In ACD See, there are a few things
you can do with thumbnails.
It's a known fact the more colors an image has, the longer it takes to download. So you can see why going with .GIF is best. The problems with .JPG are that it squeezes an image's file size down, and it LOSES QUALITY - sometimes you can see blotches and blurry spots on JPG's. On GIF's, you see more or less, dots.
"Which is best to use
Before showing you how to convert, I'm going to take an image and show it's color differences. I took a .GIF image and dropped it's colors:
Now you can't see much of a difference between 256 colors, and 16. But notice the file size difference. It's about half the size. This is a good thing. So when in doubt, try converting an image from 256 colors, to 16. If you don't like the results, you can undo this. Read on to find out how to convert images.
1. Select your image's
2. Right click the thumbnail...
3. Choose .GIF