This was originally found by larrylicker aka terrybgood aka johndoe22, someone who is banned here.
Open the an uncompressed stadium of your choosing with your hex editor.
Run a Find command for the text string "c.a.m.e.r.a.s.". Remember to search for it using Unicode String or manually add the 00's between the letters yourself.
We want to jump to the last instance of "c.a.m.e.r.a.s" in the file.
Be sure to note where you are in the file. This location changes for each stadium.
We want to look "down" in the file 5A3 bytes. If you don't want to be so precise, you can simply scroll down until you see the majority of 0000's turn into a majority of gibberish.
These are the 8 bytes we are after. This bytes change the shading on the players while they are playing in that stadium. The 0000 003F also plays a roll in this, but I think it only controls the "shading" during the Sprite Slam Dunk replays (untested). The value is controlled by the "Float (32)" value. Default is "1" or "0000 803F".
Use the Hex Workshop Base Converter or some other means to convert decimal values into floats.
The first image is with this float value at "0.9". Second at the default "1.0". And Third at "1.1". These images are from NBA 2K11.