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  • Blue Key eliminates red…?

     Ryan Stone updated 6 days, 1 hour ago 3 Members · 5 Posts
  • Ryan Stone

    April 7, 2021 at 8:57 am


    I’m having to produce a piece of chroma key footage. We shot on blue, and I’ve used Keylight in AE. However, I notice that it’s corrupting our presenter’s red t-shirt too. It goes slightly black and grainy.

    The screen matte shows it as clean white, but I’ve attached pictures below. Before/after.

    Does anyone know how I can keep the red unaffected or cleaned up?

    Thank you,


    Mac OS Catalina v 10.15.7

    After Effects v 17.0.5

  • Graham Quince

    April 7, 2021 at 1:55 pm

    Try using two layers:

    • Apply keylight to the top layer and set the output to screen matte,
    • then use the Luma Matte on the bottom layer’s track matte options.

    Quite often keylight (or any keyer) will cause some slight transparency issues with any noise present in the video, so this way you can bypass it.

  • Stephen Smith

    April 7, 2021 at 2:55 pm

    All you need to do is select the “Screen Matte” drop down option so you can see all of the screen matte options. In the drop down is “Replace Method” and a box next to it. The box default to “Soft Colour”. Change it to “Hard Colour” and the shirt will be nice and smooth. Or you can do “Source” but your blue spill will come back so you will need to add an advanced Spill Suppressor effect and change that to Ultra and then select your blue color. Best of luck.

  • Ryan Stone

    April 7, 2021 at 5:13 pm

    Thanks Graham, unfortunately this didn’t work :/

  • Ryan Stone

    April 7, 2021 at 5:14 pm

    Thanks Stephen, this did work a little so I’ll continue to tweak.

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