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Scale values in `decfa` #1751
The function dipy.io.utils.decfa currently expects as input a color FA image that has been scaled, so that it can be cast into the uint8-based dtype that is used in the function itself.
If users provide the output of our color FA function, the result is most likely to be a volume full of (0, 0, 0) tuples, which is useless.
We need to either document this behavior or (maybe even better?) scale the data within the function.