CSS workaround for differential aspect ratios?

[designosis]

I'm looking for a workaround to the issue addressed in #148. In the demo example, the problem is barely apparent, whereas with regular photos it's quite jarring.

This jsfiddle shows the jump better.

This could be a workable solution with a bit more thought.

Any ideas on how to handle this correctly?

[designosis]

On second thought, this probably overcomplicates an otherwise simple and excellent tool. Never mind :)