There are lots of amazing photographs of nebula around. The colors contribute greatly to their grandeur. But if we were able to get near enough to a nebula to see it with the naked eye would it possess the colors we see in published photographs taken by telescopes? Or are the colors in astro photos in some way artificial or exaggerated? Similarly I note that some astro photos show effects similar to a photographers starlight filter - have these shafts of light been added for dramatic effect in digital post-processing (eg photoshop) or are they genuine artifacts, eg of the telescope optics?