<p>Without seeing the tutorial, it's difficult to say exactly, but I think what is happening is that the colour matte nest that you've created, is being used to control the blur on your other layer, probably by being set to being used as an &quot;alpha matte&quot;.  If your colour matte layer wasn't nested, I think Premiere wouldn't be able to see the alpha changes on that layer, due to the order in which processes are rendered in its pipeline.</p>
<p>Effectively, by nesting the matte clip, the compound blur &quot;sees&quot; the effect and the matte as a single piece of video to process. Without it, it would only &quot;see&quot; a solid colour block.</p>
<p>Un-nested version (mona is fully blurred)
<a href="https://i.sstatic.net/FWNuj.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/FWNuj.jpg" alt="enter image description here" /></a></p>
<p>Nested version - only blurred in the middle
<a href="https://i.sstatic.net/xtvV1.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/xtvV1.jpg" alt="enter image description here" /></a></p>
<p>Matte layer:
<a href="https://i.sstatic.net/PiF9t.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/PiF9t.jpg" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2020-09-02T05:47:23.917Z
_"Effectively, by nesting the matte clip, the compound blur "sees" the effect and the matte as a single piece of video to process. Without it, it would only "see" a solid colour block."_ @tomh, That's what I found interesting about it: nesting can be used to influence the outcome of an effect that's placed on a different clip. I couldn't find a learning resource from Adobe that explains this function.
tibodi
CC BY-SA 4.0
2020-09-01T18:17:44.583Z
2020-09-01T18:17:44.583Z
tomh
<p>I'm trying to follow along a Premiere tutorial on creating a Tilt Shift Effect. In it, I would create a color matte with a mask as the below: <a href="https://i.sstatic.net/OpjEd.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/OpjEd.jpg" alt="color matte with a mask" /></a></p>
<p>Then I would use the &quot;Compound Blur&quot; effect to my footage, which is sitting on layer V3. In the &quot;Effect Controls&quot; of the Compound Blur, I would select &quot;Video 2&quot; for the Blur Layer option. On layer V2, the color matte that I had created earlier needs to be nested for the Tilt Shift Effect to show properly. If I didn't nest it, then my footage would be completely blurred (see the comparison below). So my question is, what does exactly nesting the color matte do, in relation to the footage in the layer above it?</p>
<p><a href="https://i.sstatic.net/CyyJ7.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/CyyJ7.jpg" alt="un-nested color matte's result" /></a>
<a href="https://i.sstatic.net/533i4.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/533i4.jpg" alt="nested color matte's result" /></a></p>

CC BY-SA 4.0
2020-09-01T18:03:48.857Z
hi - could you add the link to the tutorial please
tomh
CC BY-SA 4.0
2020-09-02T03:34:51.130Z
@tomh, [here it is](https://helpx.adobe.com/premiere-pro/how-to/tilt-shift-miniature-effect.html?playlist=/services/playlist.helpx/products:SG_PREMIEREPRO_1_1/learn-path:key-techniques/playlist:topic/set-header:hands-on-projects/en_us.json&ref=helpx.adobe.com)
tibodi
<premiere><editing>
What does exactly nesting a clip in one layer do in relation to another clip in a different layer?
tibodi
# What does exactly nesting a clip in one layer do in relation to another clip in a different layer?

(Asked by: username_0 on 2020-09-01)

I'm trying to follow along a Premiere tutorial on creating a Tilt Shift Effect. In it, I would create a color matte with a mask as the below: [![color matte with a mask](https://i.sstatic.net/OpjEd.jpg)](https://i.sstatic.net/OpjEd.jpg)

Then I would use the "Compound Blur" effect to my footage, which is sitting on layer V3. In the "Effect Controls" of the Compound Blur, I would select "Video 2" for the Blur Layer option. On layer V2, the color matte that I had created earlier needs to be nested for the Tilt Shift Effect to show properly. If I didn't nest it, then my footage would be completely blurred (see the comparison below). So my question is, what does exactly nesting the color matte do, in relation to the footage in the layer above it?

[![un-nested color matte's result](https://i.sstatic.net/CyyJ7.jpg)](https://i.sstatic.net/CyyJ7.jpg)
[![nested color matte's result](https://i.sstatic.net/533i4.jpg)](https://i.sstatic.net/533i4.jpg)

**Tags:** premiere, editing

> **Comments:**
> **username_1**: hi - could you add the link to the tutorial please  
> **username_0**: @username_1, [here it is](https://helpx.adobe.com/premiere-pro/how-to/tilt-shift-miniature-effect.html?playlist=/services/playlist.helpx/products:SG_PREMIEREPRO_1_1/learn-path:key-techniques/playlist:topic/set-header:hands-on-projects/en_us.json&ref=helpx.adobe.com)  

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## 1 answers

### Answer by username_1 on 2020-09-01. Score: 2

Without seeing the tutorial, it's difficult to say exactly, but I think what is happening is that the colour matte nest that you've created, is being used to control the blur on your other layer, probably by being set to being used as an "alpha matte". If your colour matte layer wasn't nested, I think Premiere wouldn't be able to see the alpha changes on that layer, due to the order in which processes are rendered in its pipeline.

Effectively, by nesting the matte clip, the compound blur "sees" the effect and the matte as a single piece of video to process. Without it, it would only "see" a solid colour block.

Un-nested version (mona is fully blurred)
[![enter image description here](https://i.sstatic.net/FWNuj.jpg)](https://i.sstatic.net/FWNuj.jpg)

Nested version - only blurred in the middle
[![enter image description here](https://i.sstatic.net/xtvV1.jpg)](https://i.sstatic.net/xtvV1.jpg)

Matte layer:
[![enter image description here](https://i.sstatic.net/PiF9t.jpg)](https://i.sstatic.net/PiF9t.jpg)

> **Comments:**
> **username_0**: _"Effectively, by nesting the matte clip, the compound blur "sees" the effect and the matte as a single piece of video to process. Without it, it would only "see" a solid colour block."_ @username_1, That's what I found interesting about it: nesting can be used to influence the outcome of an effect that's placed on a different clip. I couldn't find a learning resource from Adobe that explains this function.  

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