Gray saturation fix: drop blank channels from mean#1423
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Grayscale image is calculated across blank image channels in GUI, causing saturation to display incorrectly. See #1422
The fix was to drop the blank channels from the mean calculation.
Tested with 2D/3D single and 2-channel images. Appears to be working well.
Before (incorrect):
After (with fix):
Resolves #1422