def __init__(self, name, new_value, params=None):
        self.name = name
        self.new_value = new_value
        self.params = params
Returns (height, width) tuple of slice size.
dataset/ETHPy150Open ramses-tech/nefertari/nefertari/utils/data.py/FieldData.__init__--crossover with--dataset/ETHPy150Open ejeschke/ginga/ginga/RGBMap.py/RGBPlanes.get_size