Advanced Sharpten and Show Difference Button

[tomczak]

I'm still trying to figure it out, but will ask a question ahead of time,

In the Advanced Sharpen, when Show difference button in preview is pressed, does it show the difference between the output/preview and the original or the other way around?

For instance, if I play with Halo Limits (Max Overshoot/Undershoot in Help), it looks as if it shows a difference that is reversed from what I would expect, but I'm not sure about my logic.

[jsachs]

Looking at the code, it seems the difference was supposed to be computed as preview - input, offset by a mid-level gray, but due to a typo was being computed the other way around -- will fix for next release.