Autoresize image (article preview)

[Mooff]

You could edit the template and change the <img> tag in the preview part to <div>
And then change the src part to a background. Then it would crop the image and show a 100x100 part of the original image.

But if your image is smaller it will look weird.

In addition you could change the background position around a bit so it doesn't take the upper edge of the image. But again, if your image is to small it still will look weird.