CSS style name clashes

On an image node, the image shows with a yellow background and border (with the default Garland theme).
I's coming from line 910 of Garland's style.css, and it looks like an unintended effect to me -- that style rule seems to be meant for the node content preview, and no other image sizes get any sort of styling (in fact image.module provides no styling at all).

I'd suggest changing the class applied to the IMG tag so instead of "image $label" it's something like "image size-$label" but that would break any custom style people have made for their sites.