Weird Garry's Mod problem.

So recently I opened up gmod and the textures were quite weird. The Whites were really bright and blacks really dark. Something like that. I’ll upload a picture with this thread so you can see. I didn’t fuck with the settings or anything. It was just like this. Please help. What can I do?
All my valve games or valve game mods are like it. Such as counterstrike source and TF2.

Also a screen shot of TF2 having the same problem.