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Isolate color and apply glow.
Forgive my nubness. I searched the forums and couldn’t find a thread on this, so here we go. I was wondering if there was an effect that would allow me to isolate a certain color and apply a glow to it.
I’m trying to use the audio keyframe expression to link the glow intensity to a waveform so it looks like a red light inside a computer is pulsing while the computer talks, ala HAL from 2001.
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1 Reply
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If the red light already exists on your footage of a computer then you can pull a matte for it. There are many ways to approach pulling a matte, but the first I would suggest is using a Channels > Shift Channels effect to shift all of your RGB channels to the Red channel, make a rough mask around the light and then play with a Color Correction > Levels effect to brighten the light and darken the area around it (the white areas in this image will be fully opaque, and the black areas will be fully transparent). Then use this layer as a luma matte for a red solid set to the Add blend mode. Add a Blur & Sharpen > Box Blur effect to the matte with Iterations 3 and Radius ~3 to give the red solid some glow.
If you don’t have a red light on the computer (or even if you do) it should be easy to add a red solid with a mask (or a shape layer), set the blend mode to Add and blur it.
There are, of course, many ways to approach this.
Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA
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