Most of the time I align the before/after shots in Photoshop because with the possible zoom you can see the changes in very good detail. ScreenshotComparison.com works well for more obvious and not so subtle differences, but I think nobody has really noticed the brightness/contrast change, although it stands out pretty much when aligned.

I agree that we need more testing for brightness and contrast correction values with Tweak(). This process probably is not lossless, is it? We actually pull the values down (by DeHalo) and then interpolate them up again, right?

Also more testing for DeHalo, of course.

Are your pictures based on the SR v15 script with your additions?