Night vision is colourless (rods). Day vision has colour (cones). When we humans design a camera we make so it represents the world as we see it.The only reason we see colour in astro images because of the time integration and the 'false' colour we impose on the resultant integrated images. We can make it look however we like. The trick is to make it look how we would percieve it if it was bright enough.
Colour does not exist per sey by the way. It is a result of the ratio of the three receptors (cones) intensities as interpreted by a very large brain. A wavelength of light does not have any inherent 'colour'. It is the percieved ratios between the three receptors that give rise to this sensation.
I can go on but it is a well understood phenonema.
Great double! Have you read the double stars in Orion article by Richard Jawoski (spelling?) in the Nov/Dec edition of S&S? A great read, and will form the basis of one of my observing sessions over the Xmas break.
