Here is the situation, I have old TV-Show DVD (dating back to 2002), they never been re-released (and probably never will) and the colors are clearly wrong (way too dark or simply flat).
I there a codec(s) with avisynth that can correct that to a normal standard (I mean automatic way) ?
I've searched and found codec autolevel and HDRAGC but not sure if it's the good way.
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ColorYUV() has autogain and autowhite options: ColorYUV(autogain=true, autowhite=true). But you're usually better off doing manual adjustments.
As jagabo suggested, ColorYUV() and the Tweak() functions are suggested form manual adjustment, which usually works better anyway. Learn tom work with histograms so you can look at data graphs to know what you're doing.
It would be more helpful if you could post a short sample from the video you're working with. No one is going to try to guess what your video looks like or what settings to suggest. How to make video samples from DVD or MPG using DGindex: https://forum.videohelp.com/threads/359295-Record-without-interlacing/page2#post2272359.- My sister Ann's brother
There is also RGBAdjust() and Levels(). Some corrections need to be done in YUV, others in RGB. Some YUV operations can only be done in ColorYUV(), others in Tweak().
If you upload a sample, be sure to include shots with a range of brightnesses, multiple colors, and things where we have some idea what the colors should be.