I'm still not following. Do you mean "racist software" in the literal AI sense that the software is thinking like a racist human being?
There is no point in pondering what nut-jobs think, so stop wasting your time on it.
You mean like a spot-light to the face? Then you get squinty photos.
Look at how they do photo-shoots for models and you'll understand because that kind of lighting is what's needed.
One probably has to manually adjust the gamma levels instead
A) that won't help
B) the computer vision software already filters images in multiple ways to get the optimal contrast.
Either train the staff or...
The staff where? All staff everywhere? We're going to make cops into photographers now? Also, what about video camera footage? There are two sides of the equation and your introductory suggestion is unrealistic at best.
have the photos sent to an adjustment lab
They are all digital and CV software already filters images. The problem isn't tweaking the images, it's that there isn't enough information in the images.themselves.