No dumb at all.
It is used to describe what astronomers do to images to make them more comprehensible. Radio astronomers take their shades-of-gray images and convert them to color ones by assigning red to the most intense radio emission and blue to the least intense...1/ https://twitter.com/cilversin/status/1246813334810374145

...emission recorded on the image. Intermediate colors (orange, yellow & green) were assigned to the intermediate levels of radio intensity. Black was assigned to places in the image in which there appeared to be no radio emission. This process allows astronomers to more... 2/

..quickly recognize features in the images. Typically, when looking at a photograph, the human eye can only distinguish about 16 shades of gray from one another. Using millions of colors, instead, we can often bring out details in an image that we might otherwise miss. 3/

Now, ~every area of astronomy creates "false color" images. Remember EM radiation doesn't have "real" color except for the radiation that has a wavelength of btw 400-700 nm. That little range is called the "visible" spectrum, since it is what we humans beings see w our eyes. 4/4