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Geek Culture / Green Screen software (in db)

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Mattman
21
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Joined: 5th Jun 2003
Location: East Lansing
Posted: 3rd Apr 2004 03:40
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I'm on vacation, so I can't give this some preliminary test runs, but I have a question.

After watching Spy Kids 3D all weekend (my brother got it for his b-day), is there a possibility that green screen software could be written in db? I can't think of a way to replace a whole section with one image off my head, just using the (is it pixel() or dot(), a week without computers does stuff to your memory) function. also, replacing it with an .avi, rather then a pictue.

Hope to work on this when i get home,
Matt
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Ian T
22
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Joined: 12th Sep 2002
Location: Around
Posted: 3rd Apr 2004 04:11
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Not really. Digital photography is never anything near as clear cut or sharp as computer images; although green adn blue 'bleed' less than other colors do, in real life images blur and meld in ways they don't on the computer (well, until Depth of Field). Greenscreen editing for movies is done carefuly one frame at a time to make sure nothing does wrong, in professional editing tools and suites (I suppose they might use Photoshop, but I really don't know; many large special effects companies have their own software).

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Mattman
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Location: East Lansing
Posted: 3rd Apr 2004 04:18
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I've seen software, but it is usually big on the $$$. Can't find any free, so wondering if it was possible in db. My current software sucks and can't do it
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indi
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Joined: 26th Aug 2002
Location: Earth, Brisbane, Australia
Posted: 3rd Apr 2004 04:44
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genlock or alpha channel work can be done manually or automatically depending on the software. usually the process involves pasting white dots on the wall to get a registration mark to guide movement with.
green is usually better for long distance and blue can be better for closer distances, but not always the case. I noticed this when I visited my friend who helped paint sets at fox studios in sydney for the last 3 starwars films. btw 90% of the sets where blue or green and had a series of white dots on them. In television news reports this is why all the presenters have slicked down hair to get a accurate sillouette and no fuzzy bits.


some good references can be found here

http://www.imagecels.com/im04006.html

http://www.techtv.com/screensavers/answerstips/story/0,24330,3399463,00.html

http://www.bloomfield.edu/towsen/dv/DVtutorial17.htm

http://www.cinematography.net/CML%20Blue%20Screen%20vs%20Green%20screen.htm


fall down seven times, stand up eight
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BatVink
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21
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Joined: 4th Apr 2003
Location: Gods own County, UK
Posted: 3rd Apr 2004 11:44
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I believe Green is better for video work, because it is the most distinct channel (according to discussions on CreativeCow anyway).

I have a bright green sheet that covers my dining room wall...and still haven't found the time to experiment yet I've also made a green "bag" for hiding things.(OK, the missus has made them for me)

I imagine if you want to use it in DB, or any other app for that matter, you would first need a program to save the video footage with an alpha channel, and transparency in place of the green.

BatVink (formerly StevieVee)
http://facepaint.me.uk/catalog/default.php
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