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  • Very Basic Question

    Posted by Mitch Hockley on February 9, 2009 at 11:31 am

    Hi,

    I have a video that I want to colour key, but I’d like the keying calculations to be done on only part of the video. So let’s say I have a video with two green areas, one on the left and the other on the right of the shot. Can I get After Effects to apply the keying calculations to only the right half of the video?

    In general, can I choose which area of the video to apply any given effect to, rather than to the whole scene?

    Thanks for any help,
    Mitch.

    Mitch Hockley replied 17 years, 3 months ago 2 Members · 2 Replies
  • 2 Replies
  • Dave Johnson

    February 9, 2009 at 3:37 pm

    You can choose which area of the video to apply any given effect to by either applying the effect to a masked adjustment layer or precomposing only the layers you want to apply the effect to. Which method is best depends on the specific circumstance.

    For the first method, add a solid to your comp, draw a mask on the solid to isolate the area you want to be affected, apply the effect you want, then click the adjustment layer button for the solid’s layer.

    For the second method, select the layers you want to precompose, then go to the Layer menu and select “precompose”. AE will move those layers into a new precomp and put a copy of that precomp into your main comp where the layers it contains originally were.

    I hope this helps.

  • Mitch Hockley

    February 10, 2009 at 5:23 pm

    Thanks very much for your help, I’m sorted.

    Mitch.

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