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Old 23rd June 2021, 08:17   #1  |  Link
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VHS capture: yellow on the left, blue on the right

I have a VHS capture which has some coloring problem. I don't have access to the original VHS, so I have to work with this.

It's yellow on the left hand side of the screen, blue on the right.

Is there a way of restoring the right color to it?

Here's an untouched snippet:


And an image:

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Old 23rd June 2021, 10:09   #2  |  Link
Formerly davidh*****
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Join Date: Jan 2004
Posts: 2,450
The u and v channels cross over into each other on the right and cancel each other out in the middle so there's not much colour to be recovered there.

The following makes it look fairly natural:


a = crop(0,0,360,0).coloryuv(cont_u = -100, cont_v = 150)
b = crop(360,0,0,0).swapuv.coloryuv(cont_v = -150)
My AviSynth filters / I'm the Doctor

Last edited by wonkey_monkey; 23rd June 2021 at 10:45.
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Old 23rd June 2021, 11:23   #3  |  Link
Broadcast Encoder
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Join Date: Nov 2013
Location: Metropolitan City of Milan, Italy
Posts: 2,421
Well, there wasn't much I could do, but here's my attempt:

left=Crop(source, 0, 0, -354, -0).tweak(hue=40.0)
right=Crop(source, 366, 0, -0, -0).tweak(hue=-140.0, sat=0.80)
StackHorizontal(left, right)
Cnr2(mode="ooo", scdthr=255.0, ln=255, lm=222, un=255, um=255, vn=255, vm=255)
Tweak(sat=0.40, interp=32)
Levels(6, 1.0, 245, 0, 255)
dfttest(sigma=64, tbsize=1, lsb_in=false, lsb=false, Y=true, U=true, V=true, opt=0, dither=0)

Original vs Filtered:

EDIT: Ah, David was faster than me to reply, I didn't see his reply 'till I reloaded the page eheheheh
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Old 26th June 2021, 10:04   #4  |  Link
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Thanks a lot I wonder how could such a thing happen... Anyway, it looks much better now.
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