I'm having some issues with volume renderings being too dark in yt 2.x.  I know that in the past, people have recommended using the "clip_ratio" argument in the various Camera methods in order to enhance the output image by clipping the values at some multiple of the standard deviation of the array.  Unfortunately, I'm having trouble getting it to actually do anything recently.

I slightly modified the notebook from the yt docs cookbook entry on the TransferFunctionHelper to demonstrate this issue.  If you scroll down to the bottom of the notebook to the bold text, you'll see what I mean.  Perhaps I'm misusing this infrastructure, but I figured I'd check with people here to set me straight.

Oh, and note that this is simply an example--I don't think *this* VR is too dark in the notebook, but many of the ones that I generate are too dark, and I'd like to brighten them.

Thanks for the help!

Cameron
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Cameron Hummels