-Fixed issue where data reduction was not recalculated on zoom.
Merge pull request #317 from mmcguinn/mm302

-Fixed issue where data reduction was not recalculated on zoom.
-Fixed an off-by-one error in the data reduction clipping function.
Merge pull request #318 from mmcguinn/mm302

-Fixed an off-by-one error in the data reduction clipping function.