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rickyj89135955
rickyj89135955
Known Participant
October 3, 2017
Question

Fixing noise after using Keylight on subject?

  • October 3, 2017
  • 7 replies
  • 17510 views

I have tried to use keylight on a subject before with no green bouncing on them and they always have this weird noise on their solid color non-green clothes.  Is there a way to fix this with another plug in?

7 replies

V
Volkan Dalyan
New Participant
November 23, 2021

Hi, you could also try PremierPro "Ultra Key" instead of AE "Keylight". It worked well for me. It's noise free also faster than Keylight. Just set it to "Aggressive". 

rickyj89135955
rickyj89135955Author
Known Participant
October 4, 2017

I followed the tutorial from Surfaced Studios and he does a great job explaining how to do things step by step, but it's little stuff other than noise the edges will sometimes get really jagged and I'm at a of of how to fix simple stuff like that.  I'm not making Avengers here, but geez it should be able to look a lot better than what I am getting.

brian704
brian704
Inspiring
October 4, 2017

Some of that will depend on how you shot the footage - if it is 4:1:1 you don't have much chance of pulling a good key. Little things like pre-blur on the matte and using a separate edge and core key should help a lot.

brian704
brian704
Inspiring
October 3, 2017

Also - since you can rarely pull a proper key with a single instance of keylight, you can add your mattes together and have a single layer as your fill.

Roei Tzoref
Roei Tzoref
Braniac
October 3, 2017

I see what you mean. still you can add mattes with intermediate result. one layer with keylight for core matte, another layer with keylight in the layer stack below for soft edges. mulltipass keying works with this technique too. the alpha or luma matte technique is valid of course, just different approach. here's an excellent course on keying by vfx guru Mark Christiansen. advanced stuff, he shows techniques for also multipass keying (no alpha or luma matte necessary)

brian704
brian704
Inspiring
October 3, 2017

Yes - Mark's stuff is great!

    brian704
    brian704
    Inspiring
    October 3, 2017

    Not quite - with the extra layer you have the ability to process the layer after the key - without effecting the matte

    Jose Panadero
    Jose Panadero
    Inspiring
    October 3, 2017

    Under Keylight > Screen Matte category you have a setting called Replace method. When you get a noisy result, is it better to change this parameter to Source. Also you can contrast your matte to get better result in the same category using the Clip Black and Clup White parameters. Maybe it is not perfect but a better start point to clean the matte

      soapvegas
      soapvegas
      New Participant
      November 3, 2024

      This is the definite answer I was looking for, thank you so much! In my current workflow I'm mastering for the highly compressed WebM. During workflow testing we found that many other workflows and settings lead to terrible artifacts in WebM (also the entire ordeal with premultiplying / unpremultiplying was eye-opening). Other options discussed in this thread could work for other compositing workflows, but didn't integrate into ours or had limitations.

      Setting it to "hard color" absolutely fixed it for us. Any final color corrections for contrast can be easily done after precomposing.

       

      Thank you Jose, your advice just gave us the last bit of information we needed to lock in our post workflow!

      Roei Tzoref
      Roei Tzoref
      Braniac
      October 3, 2017

      This is probably due to Keylight's notoriously aggresive spill supressing. Try this: use "intermediate result" instead of "final result" and for the spill use Ae's "advanced spill supressor". If that doesn't cut it, I recommend NeatVideo noise removal plugin

        brian704
        brian704
        Inspiring
        October 3, 2017

        You can also use Keylight to create the matte and then use a copy of the footage without keylight as the "fill". Then you can color correct that layer and do anything else without the added noise

          Roei Tzoref
          Roei Tzoref
          Braniac
          October 3, 2017

          I think it's the same thing as choosing intermediate result and without the hassle of additional layers. you're basically telling Keylight not to deal with color correction.

            Mylenium
            Mylenium
            Braniac
            October 3, 2017

            Without any info or screenshots of your footage and settings this is difficult to tell, but feel free to experiment with the Remove Grain effect. Though, to be honest, it is more likely that you need to change procedures. Your footage may be shot the wrong way or you have overcranked your settings.

            Mylenium

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