Raise appropriate exception during mask interpretation #359
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fix #350
The current behavior passes errors silently when it comes to RGB images used as masks. Rather than using an arbitrary function to cast it back to one-scale pixels (=black and white pixels), I chose to make it raise an appropriate exception during mask parsing.
It does not properly solve the issue, but it makes the problem more visible, rather than the much more obscure RuntimeError showcased in the linked issue.