Is that a real image?
I ask that because the planetary surfaces, both illuminated and in shadow, show detail; along with the starry background and the distant bright point-source of the sun. This represents an enormous range in brightness levels, I find it hard to see how some aren't either over- or under-exposed.
Keep in mind, we are at the edge of the solar system, there isn't that much light available out there. The imaging system would have to be designed to operate at very low light levels. The detectors would be overwhelmed by bright objects.
Perhaps it is a composite image put together by an artist, using the spacecraft imagery?