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View Full Version : Assistance in VHS color correction and restoration is needed


Great Dragon
6th March 2016, 16:52
Hello All,

I don't have much experience with Interlaced sources.
So I'm confused how to fix the issue like this
http://thumbnails105.imagebam.com/46990/152cc7469896857.jpg (http://www.imagebam.com/image/152cc7469896857)

I've tried QTGMC( Preset="Slow" ) but it didn't fix those color lines flickering.

Could someone help me with this please?

Here is a short sample:
https://dl.dropboxusercontent.com/u/30473146/vhs_trim_test.avi

johnmeyer
6th March 2016, 18:29
QTGMC is the wrong tool for this job. Also, the problem has nothing to do with interlacing. I suppose you might think interlacing is involved because the orange horizontal lines are "interlaced" with the normal lines. However, each horizontal line is many scan lines thick.

I don't have any suggestions on how to make it look a whole lot better although you might get a little improvement using DeFreq.

Mounir
6th March 2016, 19:09
These are hanover bars (https://en.wikipedia.org/wiki/Hanover_bars), they're frequent for Pal. fftquiver may be the right filter for this job, i'll have to dig in my archives

Great Dragon
6th March 2016, 19:15
I've removed those horizontal lines with ChromaDestipe from this thread (http://forum.doom9.org/showthread.php?p=1746942#post1746942)
But now I need to figure out how to restore color on the top of some frames.

Frame #13 from the sample
http://thumbnails105.imagebam.com/46996/f52797469950356.jpg (http://www.imagebam.com/image/f52797469950356)


AVISource("H:\_vhs\vhs_trim_test.avi")
ChromaDestripe(top=576, blur=6)
ConvertToYV12()
QTGMC( Preset="Slow")
SelectEven()


johnmeyer, thanks for paying attention to this. I'll rename the thread to be more specific on the issue.

Bloax
7th March 2016, 13:27
https://dl.dropboxusercontent.com/u/63152810/pointhalfsize.png
Funny things happen if you halve the resolution using pointresize.

But entirely useless.