Green screen Blue screen?

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July 22, 2003 at 2:22 am #9473
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underdog47

What is the difference, how do they work, and why would I need one for a lego movie?

July 22, 2003 at 2:27 am #9474
Avatar of Bob Page
Bob Page

the difference is the color :)

Like if you want to edit the background when there is green objets in front, you should use a blue screen, but if there is blue objets, use a green screen

Good luck!

July 22, 2003 at 7:58 am #9491
Avatar of Antiggo
Antiggo

And to finish Bob Pages info about bluescreening I suggest you getting BSOL for a start. Here is a link: http://www.stack.nl/~stefanvz/bsol/
To get the prog you will have to contact Wanderer. All information can be found in the link I gave you. After you realised what bluescreening/greenscreening is, you can start using more advanced software for it, like Adobe AE and other.

Hope that helps!

Antiggo

July 22, 2003 at 1:59 pm #9514
Avatar of Kapaluchi Studios
Kapaluchi Studios

You can also choose whatever color you want, such as white screen, yellow screen, red screen, and etc. The only thing that matters is, object shouldn’t have any color that resembles the screen.

July 22, 2003 at 2:19 pm #9516
Avatar of mrgraff
mrgraff

And just for trivia. the reason that blue and green screens are commonly used by the film industry is because there is very little blue or green in the color of human flesh.

November 1, 2012 at 3:27 pm #419827
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Joseph Propati

The actual phrase used for green and blue sceening is Chroma key compositing, or chroma keying, which is a special effects / post-production technique for compositing (layering) two images or video streams together based on color hues (chroma range). The technique has been used heavily in many fields to remove a background from the subject of a photo or video – particularly the newscasting, motion picture and videogame industries. A color range in the top layer is made transparent, revealing another image behind. The chroma keying technique is commonly used in video production and post-production. This technique is also referred to as color keying, colour-separation overlay (CSO; primarily by the BBC[2]), or by various terms for specific color-related variants such as green screen, and blue screen – chroma keying can be done with backgrounds of any color that are uniform and distinct, but green and blue backgrounds are more commonly used because they differ most distinctly in hue from most human skin colors. No part of the subject being filmed or photographed may duplicate a color used in the background.[3]

It is commonly used for weather forecast broadcasts, wherein the news presenter appears to be standing in front of a large map during live television newscasts, though in actuality it is a large blue or green background. When using a blue screen, different weather maps are added on the parts of the image where the color is blue. If the news presenter wears blue clothes, his clothes will also be replaced with the background video. A complementary system is used for green screens. Chroma keying is also used in the entertainment industry for special effects in movies and videogames. The advanced state of the technology and much commercially available computer software, such as Pinnacle Studio, Adobe Premiere, and dozens of other computer programs, makes it possible and relatively easy for the average home computer user to create videos using the “chromakey” function with easily affordable greenscreen or bluescreen kits.

Remember that if you use Green or Blue screen for your video, you need to have a number of good, bright lamps for the object and the screen background. Three things stand out for make a good quality effect using green screen:

1. Good lighting on the minifig and separate lighting for the green screen. If you have too much lighting on the green screen it will reflect onto the minifig or set and give you a green blur on the image.
2. High quality camera with a nice clean focus point. You don’t want a blurry edge of the minifig or it will make it harder to remove the green from the image.
3. The correct distant your minifig or set should be from the green screen backdrop. Too close and it will add green to your object, too far and it maybe too dark. You have to play with these three issues to get a good quality image that can be affected with chroma key editing.

December 21, 2012 at 10:40 pm #420455
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You only need a green or blue screen if you cannot build a set, or scene, out of Lego. Of course, in order to use green or blue screens, you need technology skills. If you use iMovie, it will only accept editing green screens. Of course if you need to build a scene which you don’t have enough Lego bricks for, you can use a green or blue screen. Good luck.

December 31, 2012 at 12:19 am #420662
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Cooked Cat Productions

sorry to gloat, but I have a 3m x 6m green screen… :D

January 2, 2013 at 7:31 pm #420690
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Green screen and blue screen are pretty much the same… if your legos have green on them use a blue screen, if they have blue use a green screen

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