NASA Channel
I watched, un-cut, the first pictures come in from mars, when the rover's cameras turned on, and the lander unfolded.
The technician got the data and immediately sent the images to the projector screen so the Spirit and Opportunity teams and leaders could see them. The images were the same as NASA released them. The colors were the same. There was no editing between the technician getting the data and displaying it, because the data was going to the computer that was being displayed. I watched it! I saw it happen. The conspiracy theory is flawed. Sure, images could have been edited since then, but I suspect that is a mistake the media or the "theorists" themselves made.
And guess what? If you change the RGB in any photo, you will get something different than what humans see. That isn't very novel.
Haha, I laugh at childish conjecture.