[yt-users] Volume renderings that are too dark

[Sam Skillman]

Hi Cameron, I always just save them first then enhance them later, since
that's an irreversible step. There is a hub project but I can't find it at
the moment. Here's the script that the hub project links to.

https://bitbucket.org/samskillman/rendering_enhancement/src/a0dc61e45e923e10d84202c4f17cb66fa989a820/enhance.py?at=default

The main reason clip_ratio isn't doing anything there is that the alpha
channel in the example notebook (since grey_opacity=True) is 1.0. This ends
up messing with the logic in clip_ratio, and tends to either muck up the
image or do nothing.

Cheers,
Sam


On Tue, Apr 22, 2014 at 3:22 PM, Cameron Hummels <chummels at gmail.com> wrote:

> Hello,
>
> 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.
>
> http://nbviewer.ipython.org/gist/anonymous/11196301
>
> 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
>
> --
> Cameron Hummels
> Postdoctoral Researcher
> Steward Observatory
> University of Arizona
> http://chummels.org
>
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>
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