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Wow, thanks for that mouse-over compare! While I’m moving the mouse on and off the pictures, I can easily angle my viewing and better see the fix on this angle-sensitive LCD screen. (CRT, come back! You were good!) It looks even better than I realized, especially on those black crayon-lines on many edges – gone!
I’ve found that DeHalo-alpha() tends to lighten the picture overall (it must be the “additive” way the fix is obtained). That’s the reason for Tweak(), to restore the luminance level. In the 1st picture group (previous post) I put in a -4 brightness. Some areas still looked a little light. So on this last group I put in a -5 brightness. What it really needed was brightness AND contrast adjustments, to balance the spectrum from top to bottom. I tried that the 1st time around, but Avisynth’s no-feedback commands made it a frustrating endeavor. That’s why I finally left contrast at it’s default value (does nothing) in Tweak() – just to let it be known it’s there and can/should be used, too.
Again, don’t let post-application “softness” mislead. It was that way before “they” applied the wrong “type” of good-news/bad-news sharpening. I made sure to limit the re-sharpening just enough so as to roughly match the original picture’s sharpness without much affecting noise, jaggies, and outline remnants, with the numbers I worked up.
LimitedSharpen() is one of those non-intuitive-numbers functions. More experimentation than in my proof-of-concept would be needed to work out stronger sharpening without also “enhancing” picture artifacts. (It’s the same with DeHalo_alpha() and it’s functionality. More experimentation need there, too.)