Image Magic is a powerful new contribution for OSCommerce designed to greatly improve the way your images are displayed. At the core of its functionality is the ability to produce smoothly rendered thumbnail (smaller) versions of your store's product images. In addition, it also contains a very comprehensive toolbox of 'on-the-fly' image processing functions to both improve your images and also, if you wish, protect them from theft and unauthorized use by your competitors, ebayers and the like.
If you are having difficulties installing or using this contribution, your first port of call should be the readme file contained within the package or available online in its most recent form:
Next, you should make sure you have the most up-to-date version of the contribution.
And lastly, read this thread to see if someone else has solved the issue.
If you are still having problems, then feel free to post here.