Dark Coat is Noisy at DVinfo.net

Rob Kraneveldt · June 19th, 2007, 11:24 PM

Hi,

One guy I've been interviewing is wearing a dark brown coat. The whole video is fine. Even he is, but his coat is kind of shimmering or wavy the rest of him is fine just his coat. Any ideas how to correct? The coat in the original .avi is fine but after keying out the background this happened.

Thanks for any help.

Bill Mecca · June 20th, 2007, 08:52 AM

I would suggest the coat is not pure brown and there are shades of the key color in the coat. Don't know the solution other than to use another key color.

Devon Lyon · June 22nd, 2007, 10:24 PM

I've also read here (still need to try it) that you can use your keyed footage as a matte on the same unkeyed footage. That way the image that hasn't been keyed is using the keyed footage as a matte but without any of the issues of what you're describing. Did that make any sense?

Rob Kraneveldt · June 25th, 2007, 11:11 AM

It does make sense, though I'll have to play with it as I'm not sure how to do that off the top of my head. Thanks for the replies. Part of the problem seems to be if I clip too much of the black when I'm in matte mode.

Emre Safak · June 30th, 2007, 07:25 PM

You seem to have a subtle key spill problem. I have never encountered this before, but my intuition would be to use a temporal noise reduction filter in avisynth, if getting a better key is impossible (always the first choice, of course).

Ger Griffin · June 30th, 2007, 08:45 PM

is he doing much moving in this shot?
if hes not you could mask around the coat on a second layer
with no key on it and allow that layer to be on top. dont go right
out to the edge with the mask and add a little feather.
devons suggestion could work well too.

June 19th, 2007, 11:24 PM	#1
Rob Kraneveldt New Boot Join Date: May 2006 Location: Port Alberni BC Posts: 15	Dark Coat is Noisy Hi, One guy I've been interviewing is wearing a dark brown coat. The whole video is fine. Even he is, but his coat is kind of shimmering or wavy the rest of him is fine just his coat. Any ideas how to correct? The coat in the original .avi is fine but after keying out the background this happened. Thanks for any help.

June 20th, 2007, 08:52 AM	#2
Bill Mecca Major Player Join Date: Nov 2005 Location: New Jersey Posts: 475	I would suggest the coat is not pure brown and there are shades of the key color in the coat. Don't know the solution other than to use another key color. __________________ Award-winning Pine Barrens Documentary! Video, Audio, Music & More

June 22nd, 2007, 10:24 PM	#3
Devon Lyon Major Player Join Date: May 2005 Location: Oregon Posts: 213	I've also read here (still need to try it) that you can use your keyed footage as a matte on the same unkeyed footage. That way the image that hasn't been keyed is using the keyed footage as a matte but without any of the issues of what you're describing. Did that make any sense? __________________ Lyon Films www.LyonFilms.com;

June 25th, 2007, 11:11 AM	#4
Rob Kraneveldt New Boot Join Date: May 2006 Location: Port Alberni BC Posts: 15	It does make sense, though I'll have to play with it as I'm not sure how to do that off the top of my head. Thanks for the replies. Part of the problem seems to be if I clip too much of the black when I'm in matte mode.

June 30th, 2007, 07:25 PM	#5
Emre Safak Trustee Join Date: Feb 2004 Location: Brookline, MA Posts: 1,447	You seem to have a subtle key spill problem. I have never encountered this before, but my intuition would be to use a temporal noise reduction filter in avisynth, if getting a better key is impossible (always the first choice, of course).

June 30th, 2007, 08:45 PM	#6
Ger Griffin Major Player Join Date: May 2007 Location: Ireland Posts: 579	is he doing much moving in this shot? if hes not you could mask around the coat on a second layer with no key on it and allow that layer to be on top. dont go right out to the edge with the mask and add a little feather. devons suggestion could work well too.