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Analyse Blur in AE
Hi everyone
Has been a while since I posted something…
I was wondering if there is a way to analyse the amount of blur on one layer and simulate that exact amount of blur on another. I’m compositing a few scenes where the cam goes in and out of focus and it would be great if I didn’t have to eyeball the amount of focus and use keyframes over time.
Cheers!
Steve
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4 Replies
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Can you share some of the footage?
Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive | RenderBreak [blog] | Profile [LinkedIn] -
Hi Walter
Here’s some footage:
https://www.dropbox.com/s/f5oc7x9mn8hateg/frame-_1.mov?dl=0
I eyeballed the original camera ball here and set some keyframes to blur the particles and the small squares. Works ok here, but as I’m going to do a few shots like these I thought there might be some plugin that does just that.
Cheers
Steve
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You might be able to gauge the focus by use the Find Edges effect, plus a wide-ish sampleImage() expression on its output. When the image is in focus, Find Edges will, well, find lots of edges. That’ll make the image darker. When the image is out of focus, Find Edges will find fewer edges and be brighter.
Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive | RenderBreak [blog] | Profile [LinkedIn] -
Hi Walter
Tried out your idea. Applied the findedges effect and the sampleimage effect to the bg layer resulting in the output colour differing from dark grey to black. Added a Adjustmentlayer with blur applied to it on top of it all (in a nested comp so as not to blur the original footage). I wasn’t quite sure how to link up the output of the sampleimage effect to the blur effect, so I made a white solid above the adjustmentlayer as a lumamatte and hooked up the layer colour to the sampleimage output.
The result is a step in the right direction: the bluring of the streaks changes as the original focus goes back and forth. But I’m finding it pretty difficult to get the correct amount of blur on the adjustmentlayer. I tried using colourcorrection effects on the white layer to make the colour differ more between white and black, but haven’t succeeded yet.
How would you link up the sampleimage output to a blur effect?
Cheers
Steve
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