current test phase depends on pillow

[paskino]

Currently the python tests require pillow. Could we save the image also as npy, so that we won't need the additional requirement?

NumPy files are basically binary array saved to file with a descriptive header, for which I've even written a small C++ reader. This means that we could write tests in C/C++ reading the npy file without problems.

[dkazanc]

Makes sense. Options:

1. Save image into a binary file and provide a reader for both Matlab and Python.
2. Save into npy and use your C++ reader to read it from both Matlab and Python?

I'd guess 1 is the simplest?

[dkazanc]

sorted with #124