Hi all,
Adam Ginsburg, a grad student here at CU who does not work with yt, was kind enough to add some nice features to set_zlim in RavenPlot, which are the plots held in the PlotCollection. These features add some flexibility to adding ticks to the colorbars on images.
Since he's not a regular yt user, I've submitted a code review on his behalf. Please, check it out and leave comments here, if you have any:
http://review.enzotools.org/r/15/
Normally, an email would be automatically sent, but there was a small error. Matt is fixing that now.
Britton