When taking screenshots with Renderer.screenShots() D.gamma() is not included in the output while programs like Fraps take the screenshots correctly.

it works differently, you can manually apply gamma if you want using Image::color

Is there any benefit to manually applying gamma with Image::color over D.gamma() other than the ability to take accurate screenshots with the renderer?

There isn't really any documentation on how to apply gamma manually and I'm having trouble doing this, any code to help?

Flt exponent=ScaleFactor(D.gamma()*-0.5f);

apply gamma:
red=Pow(red,exponent)
green=Pow(green,exponent)
blue=Pow(blue,exponent)

rgb are here assumed to be 0..1 Flt

Works, thanks!

Is there any reason to use one over the other? (D.gamma(gamma) vs. ColorMatrix)?

Edit: D.gamma(Gamma) seems to make colors richer and increases contrast?

gamma is faster than color matrix
it shouldn't have any overhead, while color matrix requires shaders drawing and texture copy