Is there a tutorial or software that can do it?
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Tons of past posts on the subject.
1. Decode to 2x views & resize to full height.
2. Do complementary color adjustment of the views.
3. Overlay the 2 views into 1.
4. Re-encode.
Probably best done in AVISynth. In fact, there was a plugin/script called "Pantarheon" (iirc) that did all the heavy lifting for you.
Scott
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