Resin adjust with extended history.

gistfile1.txt

class ResinAdjust(object):

    def __init__(self):
        self._lastBlack = 0
        self._lastWhite = 1

    def __call__(self, value):
        value = min(value, 180)

        if self._lastBlack:
            if value < 128:
                self._lastBlack = 0
                self._lastWhite = 1
                return 0

            else:
                self._lastBlack += 1
                return value - min((self._lastBlack**2), 32)

        else:
            if value < 128:
                self._lastWhite += 1
                return 20

            else:
                self._lastBlack = 1
                self._lastWhite = 0

            return value