<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_rio(self):
 """Converts the colormap to a rasterio colormap. """

        self.colors = (((self.colors * 1.0 - self.colors.min()) /
                        (self.colors.max() - self.colors.min())) * 255)
        return dict(zip(self.values, tuple(map(tuple, self.colors))))