I read through the documentation and:
1. I can't figure out what the default it is if you don't set it (did I miss it in the docs somewhere?)
2. What does it do? Does it take the bounding box and reduce and it and only use those pixels?
Is there a better place for documentation? The methods are defined but they don't really say what they do?
For instance "min" for the calculation algorithm, is it actually the minimum of all pixel values? Or is this some kind of a histogram?
Same goes with the pixel step, what is the default?