Tweak the pims.Frame IPython rich display repr

[danielballan]

A Frame displays as a PNG image in the IPython notebook. We autoscale the brightness. We considered clipping the extreme values, which can sometimes reveal more detail, but we decided against that because it can also hide extremes that can be important in edge cases. Something like this might be a better solution:

https://gist.github.com/anonymous/4dae3df711df70117a27

h/t @nikhartman

[danielballan]

@jni Do you happen to know if scikit-image has settled on a good solution for autoscaling an image without wildly distorting it or hiding important features at the extremes?

[danielballan]

Note to self: http://docs.opencv.org/trunk/doc/py_tutorials/py_imgproc/py_histograms/py_histogram_equalization/py_histogram_equalization.html

[jni]

@danielballan the short answer is no.

Long answer: application is everything. I think anything other than simple min/max scaling is playing with fire and best left to users.

If you display with a clear warning, here's a discussion about Clarity, a filter in the Camera+ app that gives very clear details with a high dynamic range:
https://groups.google.com/d/msg/scikit-image/UYzenmYrJZM/vVxsd7qM5zoJ

[danielballan]

Agreed, it's playing with fire. Maybe our impulse not to mess with it was correct. I'll take a look at Clarity -- thanks.