This article will show you:
1. How to automatically generate thumbnails of a certain size for your item images.
You need this because:
1. You want to create thumbnail images of the same size for all of your items.
1. Login to the administrator panel and select "General-->Item Settings"
2. Toward the bottom of the page find the field labelled "Image Resizing", choose the option "Resize images automatically"
3. Under the field labelled "Small Image Size" choose the maximum size for the images to be resized to.
4. Select the "Save changes" button to save your changes.