Fix issue with green tint in Merrill images #120
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The right "shielded" area is not really shielded and can't be used for calculating the black level. Removing this area completely fixes the green tint in the shadows. Closes #117.
Below is a screenshot of the shielded area from the _SDI8040.X3F from x3f_test_files while is a DP2M file. I'm showing the green channel as shown by RawDigger, the red and blue channel are similar (except the red is much noisier and the blue much less noisy).
(As an aside, that region is very conspicuous with its linear increasing exposure may be used for something).