One of the neat features of the Nikon D5300 is the ability to apply a selective colour effect to still images and video. The above example of the coffee mug is a fairly good illustration of what can be accomplished when one predominant colour is selected out of the background. The camera has the ability to pick up to three colors out of a scene.
That's pretty much an accurate rending of the blue-metallic paint on the coffee mug; everything else is muted out by the in-camera filter. The effect can be applied during real-time during video recording as well. Using the live view display, you pre-select the colours that you wish to isolate and then hit the record button.
It's nothing earth shattering, but the feature is quite accessible to somebody who isn't adept at video effects processing. It's easy to overlook something like this as a gimmick feature, but the fact that it only takes a few seconds of setup is a huge time savings over going into post-processing.
With thanks to Broadway Camera.