In fact without a grate deal of post-processioning is unlikely that you would see any stars at all. If you look at space shoots say taken form the space shuttle of the earth relative to thew black background of space you typically do not see the background stars due the relative brightness of the earth having a higher relative Lux level than the stars in the background, given the exposure of the camera recording the scene (Set to ensure that the earth, shuttle, crew members etc are not blown out) would mean that in photographic terms that stars are vary difficult to discern in day to day situations, to an astronaut the stars are clearly visible but to the camera they are not.
There is film (Taken I be leave with IR film and not visible light and hence black and white) where you can see the background stars but this type of imagery is shoot using special cameras which from my understanding are not used on every STS flight.
Regards to you.
Cyber-Angel