Creating matte to have object glow

Question

Creating matte to have object glow

I have a video scene of two people walking in front of, and in back of, and picking up and trading back and forth a large green block. The block is the ONLY green thing in the scene.

I would like the block to glow. The block is not perfectly square and orientation shifts so motion tracking points isn't really an option.

I was thinking that since it is the only thing colored green in the scene that there would be a way to create a mask, to mask out the color green and then I could apply a glow to the masked color. But I am having a tough time wrapping my head around how to actually do it.

Can anyone provide advice?

Posted on Apr 29, 2015 6:25 AM

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Answer 1

fox_m

Level 6

12,208 points

Apr 29, 2015 1:35 PM in response to Robert Kleindienst1

Use the Keyer—it will automatically key out the green block. Use a Clone of the Layer to apply the Keyer to create a Mask (click the middle button for the View to create a black/white matte.) For the original layer, Add Image Mask and drag the Clone Layer on top of the Mask to apply it. In the Mask inspector, change the Mask Options > Source Channel to Luminance. Select the original Layer again and apply the glow effect.(you can invert the mask if necessary.)

You can also use a shape mask as a "garbage matte" to limit the range of the Keyer's effect.

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Answer 2

Apr 29, 2015 6:40 PM in response to fox_m

Very helpful.....feel I am almost there......but after creating the clone layer and applying keyer, I cannot drag the clone layer into the image well of the image mask.

Am I missing something simple?

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Answer 3

fox_m

Level 6

12,208 points

Apr 29, 2015 8:10 PM in response to Robert Kleindienst

My bad... Use a Duplicate instead of the clone.

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