Creating a mask from colors on another layer

New Here ,
Jun 08, 2022 Jun 08, 2022

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I have a rendered video with different areas like sky and water color blocked and want to select those colors so I can mask out and change the brightness of those specific areas on a non color blocked render. I do this all the time in photoshop with still renders so I was hoping there would be a way with After Effects. I am working with something like this for example. cbexample.jpg

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Adobe Community Professional ,
Jun 08, 2022 Jun 08, 2022

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You do not select anything, you manipulate the channels to generate a matte using effects like Shift Channels, Channel Combiner and so on. It's called an RGB Matte and by extension applies to object IDs, surface IDs or Cryptmattes. Based on these few keywords you can easily look up a bunch of tutorials that explain the workflows and processes.

 

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Adobe Community Professional ,
Jun 08, 2022 Jun 08, 2022

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I'm not so clear on what you need to do but you could use solids and then apply Masks to them, or directly use Shape Layers to do something similar to what you're showing.

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