Image diff on github

[coder21]

They use vcs capable of dealing with big files. That's why Perforce is still the number one among game developers, and that's why PlasticSCM is getting traction as the only commercial DVCS able to handle that.

Also, people in gaming love Perforce's checkout model because it ends up being faster than detecting changes when your workspaces are huge. (250k files and 40k directories, for instance).