• GHB
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Topic: Green Screen/Blue Screen Help

Alrighty. I've got a problem with my camera where I can't get the right green/blue for keying. I mean, I don't know what exact color it is supposed to be, but right now it looks way to dry. When I key the green or blue out in my video editor, it just goes wacko and keys random stuff. (i.e., NOT WHAT I WANT) I'm using a webcam (c920 to be specific), and I'm not able to do proper keying. I'd like to implement effects and all that using keying, but I can't if my camera won't work. Here are some examples of what usually happens, using a clip with blue screen.

Raw Clip:
https://imagizer.imageshack.us/v2/417x232q90/703/77jt.png

Afterwards:
https://imageshack.com/a/img716/9651/xvlx.png

As you can see, something went wrong. Any help would be appreciated!

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Re: Green Screen/Blue Screen Help

GHB wrote:

Alrighty. I've got a problem with my camera where I can't get the right green/blue for keying. I mean, I don't know what exact color it is supposed to be, but right now it looks way to dry. When I key the green or blue out in my video editor, it just goes wacko and keys random stuff. (i.e., NOT WHAT I WANT) I'm using a webcam (c920 to be specific), and I'm not able to do proper keying. I'd like to implement effects and all that using keying, but I can't if my camera won't work. Here are some examples of what usually happens, using a clip with blue screen.

Raw Clip:
https://imagizer.imageshack.us/v2/417x232q90/703/77jt.png

Afterwards:
https://imageshack.com/a/img716/9651/xvlx.png

As you can see, something went wrong. Any help would be appreciated!

Ehm, sometimes issues with green/blue screen also happens to me. But what you should to know about chroma keying, is that it's extra sensitive to any color differences. So if you set it to chroma key color #0000FF
http://www.colorcombos.com/images/colors/0000FF.png
It chroma keys it, but when couldn't find anything like that it's starting to make some crazy errors. Your blue screen color looks more like #008CE1
http://www.colorhexa.com/008ce1.png
So what's the best solution is to use the color picker and pick exactly the color from your photo. Worked fine for me mini/smile
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Re: Green Screen/Blue Screen Help

Well, I've tried that, but it still doesn't work. I pick the color of my photo, but then it justs keys random things. I'll try to figure something out. I just got Hitfilm 2, so hopefully that will provide a solution. Thanks!

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Re: Green Screen/Blue Screen Help

You might be selecting a bad area of the blue and using too low a threshold on the colour selection for the keying. 
http://i.imgur.com/RySEyLg.jpg
GIMP found it possible to key it out in one go, so most software should be able to do it in video. If not you might have to gruel through doing it frame by frame manually.

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Re: Green Screen/Blue Screen Help

What software to you key with?

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Re: Green Screen/Blue Screen Help

CartoonKid how did you do it so neat in Gimp? mini/twitch

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Re: Green Screen/Blue Screen Help

Double post, sorry. Here's and example of keying in AE using Keylight.
http://i58.tinypic.com/517k0w.png

http://i60.tinypic.com/1ieqoh.png

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Re: Green Screen/Blue Screen Help

blur the edges, but only a tiny bit so there aren't any ridged edges

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Re: Green Screen/Blue Screen Help

jampot wrote:

What software to you key with?

Well, I use either my frame capture software, or my video editor. I prefer my video editor, because you can key in live footage, not just one static image. I just got HitFilm, so I might experiment with that to see if I can do something. And CartoonKid, I could easily key it out in my image editor, but I'm obviously not going to do that as it would take a long time.

Cartoonkid98 wrote:

You might be selecting a bad area of the blue and using too low a threshold on the colour selection for the keying. 
http://i.imgur.com/RySEyLg.jpg
GIMP found it possible to key it out in one go, so most software should be able to do it in video. If not you might have to gruel through doing it frame by frame manually.

Yes, I could easily key it out in my image editor, but I'm obviously not going to do that as it would take a long time, and I wouldn't be able to do live footage.

I must say, I'm a bit embarrassed at how good you guys are with this, and your using my photo! mini/XD

Last edited by GHB (February 3, 2014 (06:14am))

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Re: Green Screen/Blue Screen Help

Sorry, double post.

Last edited by GHB (February 3, 2014 (06:14am))

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Re: Green Screen/Blue Screen Help

BrickfilmsFromHell wrote:

CartoonKid how did you do it so neat in Gimp? mini/twitch

I just used the colour select tool and hit delete. Had to erase a little bit on the right and that's it. 

GBH wrote:

I wouldn't be able to do live footage.

Real movies use that effect all the time. You could put the transparent images together and just put your video with transparency over the footage you want where the bluescreen is.

GBH wrote:

it would take a long time

Kinda the wrong hobby to be complaining about things taking a long time to make no? mini/tongue

Last edited by Cartoonkid98 (February 2, 2014 (03:43pm))

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Re: Green Screen/Blue Screen Help

It beats masking over 70+ photos for a 3 second shot of a LEGO floating away.

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Re: Green Screen/Blue Screen Help

Cartoonkid98 wrote:
GHB wrote:

I wouldn't be able to do live footage.

Real movies use that effect all the time. You could put the transparent images together and just put your video with transparency over the footage you want where the bluescreen is.

How exactly is this done?

GHB wrote:

it would take a long time

Kinda the wrong hobby to be complaining about things taking a long time to make no? mini/tongue

Haha, sure. I guess I meant that there were more efficient ways to perform the task. But I now see this new method you brought up.

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