We recently released a crop feature. It's useful when your content doesn't quite fit the way you want it to on your displays.
For example, when creating my rule, after selecting my content I can see that my pizza picture doesn't quite fit nicely on my screen, it has black borders either size.
If we hover over the image, we can select the crop option and adjust our image to better fit our display.
What's cool is you can also do it for web page content. Let's say you have a web based dashboard but you want to highlight only a specific section. Here we're using a Geckoboard dashboard example. And we're only showing the uptime part of it on our displays.
That's it.