What do they mean by "enhanced color" in space images?

Yeah, differing light conditions are part of why the question of “what does it really look like” is so problematic. Humans are used to viewing objects under Earth sunlight, with light being scattered by Earth’s atmosphere. If the intensity or color of the light is different, our brains try to adjust it as if it were under those “default” conditions, which ironically can make things look different than if they were under normal Earth sunlight. Plus, cameras don’t work the same way eyes do - even under those default conditions, some work needs to be done to make images not look overtly wrong to us (and they still don’t even vaguely approximate the view we’d see from our own eyes).
So on top of enhanced color using filters to distinguish different features somewhat arbitrarily, the photos are being taken under conditions that we’d find too dark/bright to see well - or sometimes to see anything at all.

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