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How can i make a particular grey value in one layer reveal another layer... multiple values/layers

New Here ,
Jun 15, 2020

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Hi
I have a posterized black/grey/white mosaic layer, set to 7 on posterize (so there are 7 grey values)
It is made with a base of fractal noise, so the 7 different greys flicker aound the comp.
Examples from different points on the timeline:

BexPaul_0-1592208641441.png

BexPaul_1-1592208665131.png

I also have 7 layers with a different image grid on each (these match the squares in the mosaic grid)
Examples:
Layer 1 Dollar

BexPaul_2-1592208772123.png

Layer 2 Money
BexPaul_3-1592208788643.png
Layer 3 Skull

BexPaul_4-1592208810555.png

I want to have, for example
100% black squares from the mosaic to reveal Layer 1 Dollar
75% black (dark grey) to reveal Layer 2 Money
25% black (light grey) to reveal Layer 3 Skull (and so on)
The result being a comp with multiple symbols flickering in different positions based on the black value in the Mosaic layer.

How do i go about doing this? Please help. 
Thanks




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How can i make a particular grey value in one layer reveal another layer... multiple values/layers

New Here ,
Jun 15, 2020

Copy link to clipboard

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Hi
I have a posterized black/grey/white mosaic layer, set to 7 on posterize (so there are 7 grey values)
It is made with a base of fractal noise, so the 7 different greys flicker aound the comp.
Examples from different points on the timeline:

BexPaul_0-1592208641441.png

BexPaul_1-1592208665131.png

I also have 7 layers with a different image grid on each (these match the squares in the mosaic grid)
Examples:
Layer 1 Dollar

BexPaul_2-1592208772123.png

Layer 2 Money
BexPaul_3-1592208788643.png
Layer 3 Skull

BexPaul_4-1592208810555.png

I want to have, for example
100% black squares from the mosaic to reveal Layer 1 Dollar
75% black (dark grey) to reveal Layer 2 Money
25% black (light grey) to reveal Layer 3 Skull (and so on)
The result being a comp with multiple symbols flickering in different positions based on the black value in the Mosaic layer.

How do i go about doing this? Please help. 
Thanks




Topics

Expressions, How to, Scripting

Views

129

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Most Valuable Participant ,
Jun 15, 2020

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Levels, Shift channels, pre-composing to get a matte.

 

Mylenium

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New Here ,
Jun 15, 2020

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Hi Mylenium

Sorry to be dumb, could you please give more details of how to do it.

Thanks

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Most Valuable Participant ,
Jun 15, 2020

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Apply a levels effect on your grid, adjust the lower and upper limits to clip out the range you need, apply the Shift Channels effect to e.g. convert the luminance into transparency or apply a white fill to get a clean luma matte. Rinse-repeat for every level until you have your 7 pre-comps with the individual mattes based on the same noise grid source comp. Tweak away!

 

Mylenium

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BexPaul LATEST
New Here ,
Jun 15, 2020

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Is there a way to colour pick the specific grey level?

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