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keylight leaves black spots -chroma key

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Susan Lankeylight leaves black spots -chroma key
by on Apr 25, 2016 at 4:47:44 pm

I'm doin the chroma key with key assists (from aescripts)then I pre-composa, and finally in teh composition I apply keylight (from foundry) and an animate mask in order to hide the big shadow of the character:

But it still leavs black spots, but I don't want to lose hair detail, this is my images:
http://i.imgur.com/PBd3HmA.jpg
http://i.imgur.com/VMYvptf.jpg
which parameter inside keylight can fix it without clipping black and then losing hair detail?


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Dave LaRondeRe: keylight leaves black spots -chroma key
by on Apr 25, 2016 at 5:08:21 pm

I don't know what that script is supposed to do. Can you edify me?

I don't know what I'm looking at with those two grabs, either. If it's the completed key, it looks really good, and I don't know what you're worried about. If they're un-keyed shots, you may be better off reshooting -- it's a big pain in the neck and a big time-waste to key white -- you have to use all kinds of channel effects and animated masks to help you build a matte... which you can then use to isolate the subject.

And if you've never used Keylight before, there are all sorts of tutorials on its use... including one from The Foundry, the folks wo make Keylight.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Susan LanRe: keylight leaves black spots -chroma key
by on Apr 25, 2016 at 6:37:52 pm

do you see in the images I upload that appera a few "stain" around hair, i mean, the white background must be pure white, and I don't know hoy to delete that stains/spots

any help, please?


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Susan LanRe: keylight leaves black spots -chroma key
by on Apr 25, 2016 at 8:01:34 pm

that script does this:












but what happens is that I didn't have a shoot wihtout the character, then, I have still there the shadow of the character, which is what i'm trying to remove with keyligth, but in order to remove that shadow I must lose hair detail and i don't want to lose it, any help please?


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Dave LaRondeRe: keylight leaves black spots -chroma key
by on Apr 25, 2016 at 8:08:30 pm

Tell you what -- show us a grab of that un-keyed footage with the problem shadow. We'll have a better idea of what you're up against.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Susan LanRe: keylight leaves black spots -chroma key
by on Apr 26, 2016 at 7:22:30 pm

what happens to me is that, in order to follow the screen equalizer steps, I must have a photo of the chroma key without the character, as it tell here in his demostration minute 3:04:






for that reason, I have to create my own "clean plate" (if you the the video you will understand me), and, in order to do my clean plate I erased the character from a photo (of the clip), but still remain the shadows of the character, loook:
http://i.imgur.com/bez0mLS.jpg
and because of that, that shadows is what still appear in black "dots/stains" here:
http://i.imgur.com/PBd3HmA.jpg
http://i.imgur.com/VMYvptf.jpg


Then, how can I erase this shadows (preserving the light) in order to have a good clean plate to use? can you give me an idea, please?
http://i.imgur.com/bez0mLS.jpg
P.D.: I erase the character with "Inpaint" software.


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Dave LaRondeRe: keylight leaves black spots -chroma key
by on Apr 26, 2016 at 9:20:40 pm

I have read your post several times now and I regret to say that I have no idea about what you are doing. It almost sounds like you are making a clean chroma key background, putting the subject over the background, and then keying the subject.

But if the subject is already separated from the background, why go all the trouble of putting the subject over a new background just to do a chroma key?

I just don't understand. Sorry.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Dave LaRondeAh, NOW I understand!
by on Apr 27, 2016 at 4:26:09 pm

It took a while to get it. You're using that plugin the wrong way.

Two things must happen for it to work properly: first, the camera must be locked down. it can not move. Second, the clean plate must be a part of the shot. You can not build a clean plate. If you try, the plugin will not eliminate folds and shadows properly.

Incidentally, you are seeing that noise at a very high zoom level -- I think it's about 200 or even 400%. Look at it at a zoom level of 100%. It may look just fine.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Susan LanRe: Ah, NOW I understand!
by on Apr 27, 2016 at 6:31:53 pm

Thanks Dave, yes, the camera was locked, the plugin alsso can work with a created "clean plate", it says so here, minute 0:54:







but does not matter, thanks for all!!


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