What's the difference with my script?

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### next two lines must be run once ### dvd.WriteHistogram("dvd hist.txt", 1) bd.WriteHistogram( "bd hist.txt", 1) bd.colourlike("bd hist.txt", "dvd hist.txt")

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I tested it, and, in many scenes, beards are greenish - maybe because the BD is all green-tinted, and ColourLike doens't work properly... at the contrary, when DVD is cropped as the BD - I know there are few pixel shift - results are pretty good... and really bad when cropping are different...

At the end, to achieve a perfect result...

when DVD cropping is almost the same of BD, I could crop a bit (few pixels) the BD

when DVD cropping is really different, there are different choices:

crop (a lot) the BD, but the resulted image loose lot of information, and the aspect ratio is heavely modified
use the ColourLike, but there will be appreciable color differences between a scene and another, that could be easlily noted when scenes are one after the other.
upscale the DVD to BD resolution

solution #3 seems the best (between the worst...)

Comments are welcome.