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Hello Folks,
Last summer on a trip I forgot to take my camera and I had to shoot with a Nikon Coolpix still camera which had its settings screwed up. Result is a number of clips where the dominant colour is blue. Almost everything has different tones of blue. Now I wish to "correct" these clips so that I can have other colours and the clips become as natural as possible. I am attaching one of the clips here as an example. Help from experts is appreciated.
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The chroma channels are completely flat, but the U channels is offset (hence the purple cast). So you're out of luck as far as automated correction is concerned, there are no colors there to restore. You can reduce it to pure greyscale by removing the U channel offset. The only way to get full color is to use colorizing software and paint each frame by hand.
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Hi jagabo,
I have full confidence in your diagnostics. I have Vegas Movie Studio Platinum 12. Using that can I remove the U channel offset and how? Then I will have to colorize using probably GIMP. Concerning colorization is it better to do it in this mode or in grey scale mode. Furthermore do you think I can use some scripting software like Frame Server to do the bulk part of the work. -
Vegas doesn't work in YUV with it's filters, so you don't have access to U, or V channels directly. To make it "greyscale" you would lower the saturation to zero
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Can that be done using Vdub?
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In VirtualDub you can use the HSV or Greyscale filters. The latter works in YUV if the source is YUV. In AviSynth you want ColorYUV(off_u=-24) or Tweak(sat=0.0).
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You can use a gradient to add some faux colorization. Easier than hand painting, but not as "good".
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Hmm, is that a picture of Fukushima beach?Originally Posted by budwzr
You can use a gradient to add some faux colorization. Easier than hand painting, but not as "good".
I would keep in in proud black and white! -
Well it can't be in the North America, because they don't wear speedos in the US of A , and it's too fricken cold in Canada
Looks like aome Alien landscape budwzr -
Hi budwzr and newpball. Firstly thanks a lot for those trials. Secondly can you tell me how you do that? I opened the clip in VirtualDub and tried to apply the HSV adust filter parameters but could not get any tangible results. How do you that please? Thirdly the answer is Cozumel Beach in Mexica.
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Yeah, hahaha, just did a down-and-dirty example. I suppose if you take the time to get the coloring right it might be "usable".Originally Posted by poisondeathray
To the Ope: Its a multicolor gradient. A partially transparent colorized overlay is about the best way to describe it. It's not a panacea, but somewhat better than grayscale.
You might be able to pass it off as an artistic effect. What you do is choose two or three colors that seem to "enhance" the shot and composite over the top.
You can make that in PhoShop or any graphics software. Or maybe your NLE has a built-in tool. Most of them should. I'm using VegasPro.Last edited by budwzr; 9th Nov 2014 at 14:46.
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You could give it some cross processing look:
DSCN1182 X.mp4
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Hahaha, yeah, a dream-state look. I like that.Originally Posted by newpball
You could give it some cross processing look Maybe throw a moon in there for ambiance.
Last edited by budwzr; 9th Nov 2014 at 14:57.
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He created an image that was a gradient from blue at the top to green at the bottom. Then he replaced the colors in the video with the colors from the gradient. I don't think you can do that in VirtualDub. It's pretty easy in AviSynth:Originally Posted by SearchQuality
Original video (only greyscale information will be used):Code:AviSource("DSCN1182.AVI") gradient=ImageSource("gradient.jpg").ConvertToYV12() MergeChroma(gradient)
Quick/dirty colors painted by hand:
Colors overlaid onto original video:
The HSV recommendation in VirtualDub was to convert the video to greyscale -- turn S(aturation) all the way down.Last edited by jagabo; 9th Nov 2014 at 17:01.
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Magnificent! Mine looks like schitte now.
Last edited by budwzr; 9th Nov 2014 at 18:00.
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Nah, it's crap. But it should give the OP an idea what's he needs to do. It will takes forever with a paint program. It really needs to be done with specialized software that lets you mark objects and motion track. Even with the correct software it's a major undertaking.
Deshaking the video first will make things a little easier. -
Thanks folks. Now it is time to have a go at it. By the way it has been a couple of years since I used avisynth. Is there anywhere a good tutorial that you know?
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This issue came up in the context of underwater footage a while ago. Someone discovered this tutorial for making the corrections in photoshop by copying and remapping one of the color channels. The same technique can be used for video in After Effects.
(FWIW, I thought the results were too good to be true and was skeptical (to say the least) until I tried it myself. It does work.)
https://www.youtube.com/watch?v=pFhrTQJg6MI -
Is there tutorial for After effects I would love to try this technique on one of my videos that is captured in sephia modeThis issue came up in the context of underwater footage a while ago. Someone discovered this tutorial for making the corrections in photoshop by copying and remapping one of the color channels. The same technique can be used for video in After Effects.
(FWIW, I thought the results were too good to be true and was skeptical (to say the least) until I tried it myself. It does work.)
https://www.youtube.com/watch?v=pFhrTQJg6MI -
The technique in After Effects would be identical to the one used in photoshop. However...Originally Posted by mammo1789
In-camera sepia modes generally reduce the image to monochrome and then offset the channel balance so it goes a bit brown. In other words, you can't do it. There is no differential color information to recover. -
Many editors have Channel Mixer filters. If you're using Virtualdub, search for ChannelMixer and GradationCurves plugins.
If the OP had some footage of a hot babe, I might attempt a color fix......Got my retirement plans all set. Looks like I only have to work another 5 years after I die........
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