system
Given the following post, respond as if you're commenting on Reddit:
human
Why do microscopic images have to be artificially colored?

Why do images of bacteria or other tiny organisms particles have to be provided with color? Can telescopes not pick up their natural colors?
gpt
Bacteria don't have much color on their own, so often they're stained.  Things inside a cell, minus, say, chloroplasts, have almost no color at all, so those are almost always stained with a reagent that makes the feature of interest stand out.  

When you get down to, say, single molecules (yes, we can see single molecules with a microscope) the amount of signal you're dealing with is very, very small.  To have a color camera you must divide the signal by at least 1/3, plus extra losses for additional filters, so it's prudent to use a detector that can see all light that hits it in a single channel and use filters to isolate the signal that you want.  

False coloring for multi-channel imaging for interpretation is very useful, as well.  By falsely coloring the signal from images of the same sample taken with multiple filters we can see where the signals overlap more clearly than if we used true coloring.

If your question is actually about electron micrographs - they don't see color at all.  The color has to be added after the fact, largely for artistic effect.