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INVERTING Keying…i.e. Color Isolation
As I was not sure what to “Call” the action which I am trying to do, I had no luck searching the forums (and entire internet) for explanations on how to accomplish this…my apologies if it has already been discussed and would greatly appreciate a link to the post where it was being discussed (or perhaps the Technical Term for what I am trying to do would also help)…
Anyway, the action I’m trying to accomplish would best be described as ‘INVERTED KEYING’ or something like ‘COLOR ISOLATION’.
EXAMPLE:
Let’s say I have footage of: A Person walking down the Street, and that Person is wearing a RED BUTTON. (Let’s also assume that the RED BUTTON is the only thing Red in the entire shot).
So, obviously, if I wanted to Key Out the Red Button then I would use the Effects>Keying>Keylight function, use the Eye Dropper to select the Red Button, and that would thus make Everything Red Transparent….
But what if I wanted the OPPOSITE of that? What if I wanted the RED BUTTON to be the only thing that remains and Everything Else Besides Red to be Keyed-Out/Transparent?
I’m sure it’s simple…yet have no idea how to do it. Thanks for the help.
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3 Replies
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There is a function to invert the alpha. Then you could use this as a track matte for an adjustment layer that could color correct that spot.
Also there is a plugin called change color to or leave color… One of them has a switch to show matte only. This will make a black and white selectioin of a specific color. This can also be used as a track matte or just use the correction options in the plugin.
https://www.videocopilot.net/videotutorials/advsky/index.htm
https://www.creativecow.net/articles/kramer_andrew/blemish_removal/blemish_removal.htmlNot exactly what you’re looking for but some good info on Track Mattes.
Best,
Andrew Kramer -
I would recommend getting a clean key on the button and then using this as an Alpha Inverted Track Matte for your source footage. There are other ways to accomplish this as well. I imagine the Channel > Invert applied to the Alpha Channel would work for example.
Darby Edelen
DVD Menu Artist
Left Coast Digital
Aptos, CA -
You need to use Linear Color Key twice on the same layer. In the first one, key everything out, it doesn’t matter how. Then you need to turn it off for a moment. In the second one, use the color picker to select the color you want to keep from the image. Then, click on the drop down menu that says Key Colors. Instead, select Keep Colors. Then turn the first Linear Color Key back on. The first instance of Linear Color Key keys everything out, whereas the second instance brings the desired color back in.
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