Originally Posted by Tent Pitcher

Not sure by your question, but if you are using the "Image Resize" option then you will get a distorted picture if you don't have the "Constrain Proportions" box checked. If you need a specific sized thumbnail that is a different aspect ratio than the original image, then you should use "Canvas Resize" to crop the image to the correct proportions either before or after using "Image Resize".

I might be able to offer some more advice if you post more details.