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I shot on white bg
Hi,
I shot a few CU’s from the chest up of some actors. I did this on a white BG with intentions of removing the white bg in post. I have seen people use this with as good a result as if it was shot on a green/bluescreen. But I can’t get rid of the spill in the actors hair. There is a white line around their head.
How do I get rid of this white line and completely seperate my actors from the bg?
thanks a lot
michael
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12 Replies
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All good chromakeying requires several filters and maybe stacked copies of the footage with different filters and masks. Keying out white is supremely difficult with standard video formats; you have not mentioned which format you’re working with.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”
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Yeah I know, Im trying to watch “super Tight junk Mattes” by Aharon. Hope its the solution.
The format we recorded on was XDCAM HD MPG High Quality 1080i50.
So it should be possible, to make a decent keying, its just the process with the layers. .Status on progress after the tutorial.
Thanks
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Hey Kevin,
I just saw Andrew’s new tut. But it seem that keylight, wont work on white background, any reason why?
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Hi Michael
I do agree with Dave, make sure that you have a plan for post before shooting.
I have been able to “key” a white background before, but it will depend on what your footage is like. If you duplicate your footage layer in your comp, make the top layer high contrast black and white to use it as a track matte for the layer below. That way you don’t have to worry about messing up your actual footage or worry about keying out lighter parts of the actor. Again, it will depend on what your footage is like, but it may be what you are looking for.
Hope that makes sense!
-Jessica
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Hi Michael
I agree with Dave, pre-planning for post is ESSENTIAL!!
Since you are stuck with what you have, one thing I have done with getting rid of a white background is to duplicate your footage layer and create a track matte from it. Usually there is enough contrast between the actor and the white background, but it will depend on what your footage is like.
Hope that helps!
-Jessica
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have you tried the Simple Choker or Matt Choker effects? I used this once to get rid of the slight edge left from a premultiplied shadow next to a transparency.
see if it works.
Also, check out spill suppressor under keying in the effects menu. That’s what it’s for.
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And have you tried just a straight up luma key?
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Another idea is to see how well you can use a luma key… Probably throw a levels or curves (or both) effect on the footage first to brighten up the background and make sure that the “talent” still looks properly exposed. May not work depending on your footage..
But I’m sure that’s not really where your problem lay.. You mentioned that the spill is what your problem is.. That, I’m afraid to say, is not what this Noob knows how to handle with good results yet. I normally just try to do the same thing 5 different ways and see which gives the best results (in the best time)..
https://forums.creativecow.net/thread/1/856049#856049
–KTFA
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[Michael Gug] “But it seem that keylight, wont work on white bagground, any reason why?”
Keylight is a color difference keying solution, it requires that there be a strong primary color in the background (usually green/blue).
You’re dealing more with a luma key. In your case you’ll want to push the background further into white and bring the foreground closer to black, then invert the image and use it as a matte… Something involving Levels/Curves, Tint and Invert perhaps.
Darby Edelen
Lead Designer
Left Coast Digital
Santa Cruz, CA -
Hi Michael,
For keying white you almost always want to use the “Extract” keyer, not “Luma.” Just drag in the top right point, and then drag the bottom point back a little to smooth it out. If you’re still having problems with your edges just apply a Simple Choker or a Matte Choker.
Hope that helped!
-Grant Swanson
https://videoapex.blogspot.com/
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