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-[no]burnin

Tracks brightness of the screen during play and at the end of
emulation generates a PNG that can be used to simulate burn-in
effects on other games. The resulting PNG is created such that the
least used-areas of the screen are fully white (since burned-in areas
are darker, all other areas of the screen must be lightened a touch).
The intention is that this PNG can be loaded via an artwork file with
a low alpha (e.g, 0.1-0.2 seems to work well) and blended over the
entire screen. The PNG files are saved in the snap directory under
the gamename/burnin-.png. The default is OFF (-noburnin).