There are a number of web pages about the perception and reality of colour in astro images.
http://astronomy.stackexchange.com/q...ages-represent
http://www.astropix.com/HTML/I_ASTROP/COLOR.HTM
I was having this discussion the other day on another forum where people debated that as I could see green in an image they said it was my monitor. Although the green was apparent on three different monitors I used to view the image.
I argued that this was not the case but my eyes are green channel dominant
http://hyperphysics.phy-astr.gsu.edu...on/colcon.html
http://www.webexhibits.org/causesofcolor/1C.html
Anyone who's had an eye test will remember the red/green screens and which appeared more clearer to you.
Colour perception in an image is in the eye of the beholder, and much of what we do in astro photography, as Brendan stated is art