help with green screen

zackshapira12

Newbie Joined: Feb 29, 2012 08:54 Messages: 6 Offline

Solved by

Mar 21, 2012 09:21

Shalom All:

We are having hard time getting the green screen to display correctly, I am not sure what is wrong, but I put a short 6MB video here:

http://www.ahavatammi.com/videos/3pt%20test_0.mov

see if you can make it work somehow, if you need the source 6mb video, just sent me an email, and I will gladly email you the source video. We did everything by "the book" according to our Tech. director, and yet it is still not working.

Your help is greatly appreciated.

Rabbi Shapira

Bastian74

Senior Member Joined: Dec 06, 2010 12:12 Messages: 204 Offline

Mar 21, 2012 11:13

Thats my results with the settings below.
I've never tried greenscreen in PD, so I was curious to test it out.

You have to use the water-dropper to select the green color.
Also, background goes up upper track
Your video goes on lower track.
Select your track and hit modify
Enable chroma key

It's a little disappointing that there does not seem to be a blend setting, resulting in very hard aliased edges.


Filename	ChromaKey.JPG	Download
Description
Filesize	144 Kbytes
Downloaded:	390 time(s)

This message was edited 2 times. Last update was at Mar 21. 2012 11:24

shotaw13

Newbie Joined: Mar 26, 2012 11:59 Messages: 2 Offline

Mar 26, 2012 12:25

After removing the green screen background the overlay video image has a glittering edge. How do I fix this?

Bastian74

Senior Member Joined: Dec 06, 2010 12:12 Messages: 204 Offline

Mar 26, 2012 12:42

I did not notice any feathering option in the masking, which kind of sucks IMHO.
You'll need to use some blurring across the whole image, which is going to reduce the effective resolution.

JoeVideo

Newbie Location: Los Angeles, California, USA Joined: Nov 27, 2011 16:08 Messages: 31 Offline

Mar 26, 2012 21:54

Shotaw13
If you gotten to the step of using the eye dropper, there are some adjustments you can make to "tolerance of intensity" and/or "tolerance of hue"...adjusting those settings may get rid of the glittering edge. I play with those settings, in particular "tolerance of intensity" to get rid of unwanted greenish hue around the image. JoeVideo
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CubbyHouseFilms

Senior Contributor Location: Melbourne, Australia Joined: Jul 14, 2009 04:23 Messages: 2208 Offline

Mar 26, 2012 22:13

Hi Rabbi Shapira

For a great Green Screen result see the video below (in particular the lighting):

Happy Editing

This message was edited 1 time. Last update was at Mar 26. 2012 22:13

Happing editing

Best Regards

Neil
CubbyHouseFilms
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shotaw13

Newbie Joined: Mar 26, 2012 11:59 Messages: 2 Offline

Mar 27, 2012 16:21

Helpful information. Thank you. I have played with the intensities and blur, but still not completely heard edges. The video noise adjustment fixes the edges, but video is not smooth. The aspects of the background and chromakey videos are the same and the green screen is good.

Is it possible that some of the problem is caused by my computer's capabilities and will not be visible when burned to a disc?

Bastian74

Senior Member Joined: Dec 06, 2010 12:12 Messages: 204 Offline

Mar 27, 2012 16:42

Are you trying to make people think you are actually on-site so that they cannot tell it is a green screen?

I don't think powerdirector is going to do that for you, plus you'll need to reproduce the background lighting on the stage to align white balance / shadows etc.

Post a sample of your latest green-screen test with better lighting for the actor and the green screen.

BarryTheCrab

Senior Contributor Location: USA Joined: Nov 06, 2008 22:18 Messages: 6240 Offline

Mar 27, 2012 19:08

PowerDirector is totally capable of green-screen/blue-screen/any-screen video.
It's all about lighting, even lighting, no wrinkles, no wrinkles, even lighting, decent camera, no wrinkles, even (not nuclear) lighting, no wrinkles. Get it?
The link you (zackshapira12) show is incomplete. Post your final video with the screen replaced. As of now, I cannot see anything wrong.

http://youtu.be/MhYpssoRBgY

This message was edited 1 time. Last update was at Mar 27. 2012 19:15

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Bastian74

Senior Member Joined: Dec 06, 2010 12:12 Messages: 204 Offline

Mar 27, 2012 19:50

The melting woman has a green hue and is aliased.

Perhaps if the background image had a lot of green in it, the green hue would look more natural. To get rid of the aliasing you would need to feather the mask, or blur the entire image.

BarryTheCrab

Senior Contributor Location: USA Joined: Nov 06, 2008 22:18 Messages: 6240 Offline

Mar 27, 2012 19:54

I do not see a green hue in my video, I do not see any aliasing. It is a low-res test that I did and I still am not sure of what the green-screen issue is in the 1st place. Unless the screen is replaced by a chosen backdrop this is just talk.

This message was edited 2 times. Last update was at Mar 27. 2012 20:00

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Bastian74

Senior Member Joined: Dec 06, 2010 12:12 Messages: 204 Offline

Mar 27, 2012 19:59

It stands out on her cloths and near vertical surfaces.


Filename	Capture.JPG	Download
Description	Green and aliasing
Filesize	11 Kbytes
Downloaded:	368 time(s)

BarryTheCrab

Senior Contributor Location: USA Joined: Nov 06, 2008 22:18 Messages: 6240 Offline

Mar 27, 2012 20:09

Low-res, 30 seconds to throw together, add a "melt" special effect, then stop the video and do a screen-grab. You want perfection?
I still cannot judge the video in question till Shotaw13 actually replaces the background with what they want.
My point still stands, PowerDirector is totally capable of producing a perfect green/blue screen effect, if given a good file to work with.
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Bastian74

Senior Member Joined: Dec 06, 2010 12:12 Messages: 204 Offline

Mar 27, 2012 20:10

I think the results are fine, but the original poster seems to want it to stand up to forensics.

BarryTheCrab

Senior Contributor Location: USA Joined: Nov 06, 2008 22:18 Messages: 6240 Offline

Mar 27, 2012 20:52

I see shotaw13 has a wrinkly screen, and I suspect that may be an issue. Storing a green-screen wrinkle-free is not taken lightly! If I really need it in tip-top condition, I'll take it out, sun it, recite a little Tennison to make it relax...
Anyway, PD is good-to-go, it's all in what you give it. HP Envy Phoenix/4thGen i7-4770(4@3.4GHz~turbo>3.9)
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Bastian74

Senior Member Joined: Dec 06, 2010 12:12 Messages: 204 Offline

Mar 27, 2012 21:00

If the screen is too bright, and the subject is too close to the screen, the screen itself will cast diffuse green light onto the subject which would be very difficult to deal with. This is also true if the subject is not in perfect focus.

CubbyHouseFilms

Senior Contributor Location: Melbourne, Australia Joined: Jul 14, 2009 04:23 Messages: 2208 Offline

Mar 27, 2012 22:11

Hi All

Further to what Barry has said - the green screen must be shadow and wrinkle free.

Lighting is also critical with a key light and overhead/backlight. No wrinkles and no shadow. See first video post on 'How to do this'.

Here's a very short clip to highlight that PowerDierctor10 can perform green screen / chroma key.

Note this was my FIRST attempt using inadequate lightning and a green bedroom wall!

However, it does give the impression that I was outside in front of a motorbike trailer in the countryside not a photograph I took a few days before.

This message was edited 1 time. Last update was at Mar 28. 2012 02:31

Happing editing

Best Regards

Neil
CubbyHouseFilms
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My Vimeo Channel
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Cranston

Senior Contributor Location: USA Joined: Aug 17, 2007 02:26 Messages: 1667 Offline

Mar 28, 2012 03:37

Can anyone join this Chroma Fest?

(Old PD8 contest bit > Pre-keyed stock footage > PD’s chroma key tool)

Having seen other editing apps’ chroma key tools, I still maintain that PD’s chroma keying capabilities is perhaps PD’s weakest link in the Editing module. Hopefully Cyberlink will consider providing a more flexible tool with multiple adjustment options, in future releases. Just my opinion.
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