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Delta Keyer Not Working?

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JeffreyWalther

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Delta Keyer Not Working?

PostFri Dec 02, 2022 2:26 pm

Hi!

I just wanted to test if you can key a darker background when you have a perfect clean shot of the background (clean plate). I have made two PNGs for this purpose.

However, the Delta Keyer does not seem to be interested in my finished Clean Plate. Am I making a mistake?

Plate.png
Plate.png (182.33 KiB) Viewed 492 times
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jallen0

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Re: Delta Keyer Not Working?

PostFri Dec 02, 2022 2:29 pm

I am not a fusion expert however don't you need a media out?
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JeffreyWalther

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Re: Delta Keyer Not Working?

PostFri Dec 02, 2022 2:57 pm

jallen0 wrote:I am not a fusion expert however don't you need a media out?

Only for final output. Here I am previewing the last node on the 2nd screen.
DaVinci Resolve Studio V18
Fusion V18
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AMD Ryzen 9 3900X (12x 3.8 GHz), MSI X570 Unify
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jallen0

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Re: Delta Keyer Not Working?

PostFri Dec 02, 2022 3:21 pm

lol This is why I don't answer Fusion questions. Sorry I have no thoughts.
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Bryan Ray

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Re: Delta Keyer Not Working?

PostFri Dec 02, 2022 3:57 pm

Delta keyer is what is known as a color difference keyer. It works by measuring the distance between two color channels. It just won't do anything for an image that is monochromatic. At best you could set the screen color to red and isolate the red gear, but you'll never get a matte for pixels with no saturation, no matter how amazing your clean plate is.
Bryan Ray
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JeffreyWalther

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Re: Delta Keyer Not Working?

PostFri Dec 02, 2022 7:31 pm

I just wanted to let you know that I wasn't wrong with my setting. It just doesn't work with the dark background. I replaced it with a "dirty" green and it worked.
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Sam Steti

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Re: Delta Keyer Not Working?

PostSat Dec 03, 2022 10:07 am

Hey,

1/ yes, your settings are not "wrong", but the idea of using a delta keyer here is a mistake. Use a Luma Keyer instead to have better results;
2/ also give a try to the difference keyer... I never do but know it's made for this;
3/ there are several ways to get rid of black anyway, including very basic but rock solid efficient ways with a couple of nodes, with a bitmap node inside ;)
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