nanshe/misc/neuron_matplotlib_viewer.py: Skip converting images to float before using them.
nanshe/misc/neuron_matplotlib_viewer.py: Skip converting images to float before using them.

DudLab/nanshe,nanshe-org/nanshe,DudLab/nanshe,jakirkham/nanshe,nanshe-org/nanshe,jakirkham/nanshe