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How to reduce edge-enhancement?

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Jim Arco
How to reduce edge-enhancement?
on Feb 16, 2010 at 8:23:03 pm

I am working to improve some footage shot with a consumer-level miniDV camera from a few years ago. Typical of these cameras, there is a significant amount of edge-enhancement (to make the picture look like it is sharper.) This shows up as a dark edge or outline around objects in the image.

I have been able to make the footage look quite a bit better in terms of color, noise, and white balance. Of course, that seems to make the edge enhancement even more obvious.

I think Boris Continuum has an edge-blur filter that hints that it might improve things, but that is not available on this machine (and the budget doesn't provide for the purchase of BCC.)

I seem to remember seeing a posting somewhere on how to reduce the visibility of over-enhanced edges, but my web-search is not turning anything up. Anyone have a good 'formula' for reducing over-enhanced edges?



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Michael Szalapski
Re: How to reduce edge-enhancement?
on Feb 16, 2010 at 8:45:09 pm

One solution is to duplicate your footage twice, apply find edges to one layer and use it as a luma matte for a blurred copy of the footage.

- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.


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Kevin Camp
Re: How to reduce edge-enhancement?
on Feb 16, 2010 at 8:57:59 pm

you could also use find edges on a copy of the footage and then use compound blur on the original footage, setting compound blur to use the find edges layer... this would require pre-comping the find edges layer with the effect on it.

compound blur would then blur the more distinct edges more than the less distinct edges, which may be beneficial...

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


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Kevin Camp
Re: How to reduce edge-enhancement?
on Feb 16, 2010 at 9:02:06 pm

using michael's track matte suggestion, but using the median effect instead of, or with a blur effect might also help.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


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Peter Litwinowicz
Re: How to reduce edge-enhancement?
on Feb 17, 2010 at 7:38:24 pm

You can also use our SmoothKit Gaussian Per Pixel (SmoothKit is $119). It has a mode to blur using the "Gradient Magnitude" as a compound blur control ("gradient Magnitude" is a fance word for "edges").

To see the control map that the plugin is using, you can set the Process Mode to "Show Control Maps". Then set AE to view the Blue channel and you'll see the size control displayed (white== max blur, black==no blur).

http://www.revisionfx.com/products/smoothkit/
Pete Litwinowicz
RE:Vision Effects, Inc.




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