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Copy edge pixels and expand edge color?

Explorer ,
Jan 11, 2019 Jan 11, 2019

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I'm looking for a plug in or script that could help with a very specific issue. I have an object that is out of focus and I need to replace what is behind it. I'm aware of the regular methods and techniques to achieve this, but I'm looking for a faster way. I'm looking for a way to use a filter such as Stroke or Edge Finder in conjunction with a mask to create an outline on the layer. I want to mask the object at the point of the last solid bit before the blur begins and apply a filter that creates a stroke on the mask. Instead of using a single color the stroke, I want to have it sample the color of the pixels of the image at the edge of the mask and expand them outward. Basically, I want fake a "Strait Alpha" so I can defocus from there. Does anyone know of anything that can help achieve this? Thanks.

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Adobe Community Professional ,
Jan 12, 2019 Jan 12, 2019

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Easily done, but not with plug-ins or any of that. You simply need a ton of pre-comps as duplicates of your source footage and then work with Track Mattes, Shift Channels, Set Matte, Minimax, Matte Choker and similar effects. You would apply Find Edges to one of the pre-comps, then use the resulting greyscale image as a matte and massage it further with the mentioned effects to increase its thickness, smooth and feather it. this can then easily be used on another (blurred) duplicate of the layer/ comp as a matte to get your colored edges. Similarly, with additional masking or channel-based voodoo individual areas can be extracted. Again, no magic, just work and a relatively complex setup.

Mylenium

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Community Beginner ,
Nov 08, 2020 Nov 08, 2020

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It's very possible this is asking too much, and please dont take it as me being rude.

 

Would you care to explain a bit more specifically this approach?  I dont have a ton of experience with AE, but am trying to extend the pixels of an animated layer with a character dancing across it (the character is the only non-alpha pixels on the layer). I think I am in essence trying to do that which you explained above.  Thanks alot.

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Engaged ,
Jan 12, 2019 Jan 12, 2019

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Hi. Have a look at the Refine Matte effect, it may do what you need with a bit of study.

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Adobe Employee ,
Jan 17, 2019 Jan 17, 2019

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Hi TheFosterHouse,

Did any of the suggestions mentioned above help?


Let us know.

Rameez

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New Here ,
Jan 17, 2019 Jan 17, 2019

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Thank you all for the tips. Mylenium gave me an idea. Rather than the mass of precomps and duplicates, I was able to use RedGiant's Hall of Mirrors plug-in on the masked area. Scale set to 1.01 and ramping up the number of images to about 50 gave the edge I was looking for. The center of the shape was averaged via Tracker-Vis, so I got a decent center point for the effect. It may not work on all examples, but it gave me what I was looking for. Thanks.

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Adobe Employee ,
Jan 18, 2019 Jan 18, 2019

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Thanks for coming back and letting us know.

Regards,

Rameez

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New Here ,
Mar 04, 2021 Mar 04, 2021

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Use CC RepeTile with the slide setting for Tiling. Super easy. It will be based on the original size of your layer, so you will have to resize a precomp to the edge you want to use.

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Explorer ,
Apr 05, 2021 Apr 05, 2021

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great solution. masking the effect off helps hide seems as well.

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