Don't forget that, as well as refraction effects, the stars look different colours because they, in fact, different colours!
Magnitude isn't really a factor - stars are different colours depending on their temperature (itself dependent on size). Cooler stars arr red or orange. Hotter ones are white or blue.
The effect is noticable from here on Earth - Sirius is the brightest star in the northern hemisphere and is a prominent white. Betelgeuse (the left shoulder of Orion) is an unmistakeable red-orange colour as it is a lot cooler (and older) than Sirius.
Like ETOPS said, refraction will pay a part - have a look at the colour of the Moon when it's very close to the horizon - it's definately more orangey.
Our eyes can pick this up...whether the fidelity of the these cameras is good enough to I wouldn't know...
Regards,
V1R
