Talk:Bluescreen

Chroma key
I would like to point out that Chroma key is now the collective term for all these systems where a colour is used as the 'key' for inserting an image or footage into moving image systems. I am tempted to revise this article. bob

The television technique of chroma keying was originally developed as an inferior imitation of bluescreen.

I thought chroma keying is bluescreen (or greenscreen, or whatever). This article as it is doesn't convince me otherwise and I think this article should be merged with chroma key. --Furrykef 20:35, 5 Oct 2004 (UTC)


 * I have to agree that this article should be merged with chroma key, or CSO, and retain one of those titles, as they are the more correct technical titles. Blue screening is just chroma keying, it happens to use blue, so is given the informal title of blue screening, just as green screening, red screening, or any other colour screening you would care to mention, are all chroma keying.  CSO might be a better subject for the whole thing as a title, as I'm fairly sure it can be applied to technologies old and new as more of a theory than specific technology. --SnakeSeries 13:32, 18 February 2006 (UTC)


 * I agreee that this article should be merged. Chroma Keying is the process of removing any color from a picture, and blue is a color right? --Nweinthal


 * A vote here for merging too, especially since no other synonyms for chroma keying listed in its article have their own pages. --Jmptdc 13:38, 20 July 2006 (UTC)


 * A vote here for merging, and for turning this article into a disambiguation page. InvertRect 18:25, 3 September 2006 (UTC)


 * Agree. Added . --Bensin 00:45, 28 January 2007 (UTC)

Green screen
The term green screen has also been used to describe old green-tinted computer displays.

This is currently commented out at the top of the article. As greenscreen redirects to bluescreen, this may be helpful for visitors. Jareha 19:01:52, 2005-08-22 (UTC)

Windows(R)-Bluescreen
The term "Bluescreen" is also used for a special type of error messages on Microsoft(R) Windows(R). When the graphical system crashes completely, Windows switches to a curses-like mode and displays an error message on blue background.

See: http://images.google.de/images?q=bluescreen


 * I've added a disambiguation link to the Blue screen of death article.

Clothing
I had once toured a television studio when I was in high school. We had found out about wearing certain colored clothing ahead of time, so I had worn a light blue jacket in. So when I stepped in front of the screen it looked like my torso had disappeared. --JesseG 07:14, Feb 27, 2005 (UTC)

Color Components
"His technique exploits the fact that most objects in real-world scenes have a colour whose blue colour component is similar in intensity to their green colour component."

Why is it important that the blue and green color components are similar? I would think that if ones uses a blue screen the intensity of the green color component wouldn't matter... --BobaFett 19:36, 9 July 2005 (UTC)

Not exactly. Typically, one keys a bluescreen based on the parts where the blue channel is higher than the green channel. This is because if you only look at the blue channel, it's impossible to differentiate blue and white. Forkazoo 23:15, 2 August 2007 (UTC)

images
it would be nice to have images that are a pair (the ones in the article seem to be from totally seperate sources).

Rearranged confused article
The article was confused over the difference between different film techniques, so I have reordered the information and added some of my own. Basically, Chroma Key is a television idea that is not used on film. Chroma Key is a piece of “cake” compared to the process used to film the battle scenes in the original Star Wars films. Also the sodium vapor process is an outdated method no longer used in modern film, so I've moved it away from the collection of greenscreen and redscreen. Also, the “greyscreen” sounds awfully like front projection. Unless there's a television technique I don't know about (my interest is movies not TV weather girls) I'll alter it. Scott197827 5/02/2006

Well, now it's simplified well enough to be an article in Entertainment weekly. This is an encyclopedia after all. The optical film details are appreciated, however this is a broader topic than what was done in Star Wars. And incidentally, blue screen optical travelling mattes are as obsolete as sodium vapor mattes.

Modern motion picture practice is far closer to television practice nowadays. The primary difference is whether the end result is processed in real time for live transmission, or completed as a post process, where it can be cleaned up and finessed further. Ultimatte, originally a television process based on color difference matting, but working far better, was the forerunner of most of the software and hardware techniques now in use.

Gray screen mattes, though rare, are not front projection. Just realisation that for most high end work, so much hand roto is now done digitally, that it sometimes barely matters that there is a troublesome screen in the background spilling it's color all over the foreground elements. StevenBradford 5/02/07
 * Okay, so this is an encyclopedia. maybe we should delete everything that happened more than ten years ago as it is “no longer relevant”. Everyone knows that if you stand in front of a bluscreen and push a button a weather map appears behind you. But some people might like to know how th process was done in the past. In fact, as of the year 2000 many effects companies still had their old optical printers as CGI was still an expensive process. Maybe they still retain them. It's certainly not a lost art yet.


 * If you're really upset by my additions, maybe there should be a seperate section for chroma key. Scott197827 7/02/2006

Why not a UV-screen?
Ultraviolet light, so called UV-radiation, is invisible for the human eye since its wavelength is shorter than that of visible light. So what if they built a screen which had a layer that reflected UV-light? For the human eye the screen could have a blue og green color, but a special camera that is able to "see" all visible colors plus ultraviolet light, the screen would of course appeare in a UV-color (it would obviously be important that the actors didn't use any cloths or objects that reflected the UV). The camara could then send its information to the computer, that would make the color visible for us in its own way. For instance, like turning the screen green, red or blue while all the actors and props looks black and white or don't even show at all, only visible as blank areas shaped as silhouettes. When the background had been added, the computer would give back the other colors again, making the colorful actors standing in front of a colorful background. Could it work?

>Apogee had a process that used some of these ideas, in the mid 80s, I believe it was used on Firefox, among other films. -Steven Bradford


 * I can see two main advantages to using a visible colored screen.


 * its much easier to handle something you can see. With UV you'd have to check out all materials and any ready-made props with special cameras and lighting. With a bluescreen you just have to make sure you don't use anything thats too close to a deep primary blue (which is actually quite rare i'd imagine) and if you really need to use something a deep primary blue theres always the option of green or red screens.


 * Youd need a heck of a lot of special equipment to use UV. With a bluescreen all you need is one special box or peice of software too do the mixing. With a UV screen you'd need special lighting, special cameras, special interconnects (4 channel rather than 3), special edit gear (if you did any editing before the overlay mixing), special boxes to convert for monitoring during takes etc.

Merge
I don't think this article should be merged with Chroma key because Chroma key is about television and Bluescreen is about film. They should be separate but have references to each other. --WikiCats 10:55, 13 September 2006 (UTC)

Tags
The reasons for the inclusion of the tags will have to be discussed or they will be removed. --WikiCats 10:51, 20 September 2006 (UTC)

Blue screen image set up incorrect
Isn't it a little weird that on the Bluescreen page Wikipedia shows a image of a incorrect setup, but not a single setup that is correct? I think we ought to show a correct example, but I have not bluescreen nor any projectors or high-power lamps. --80.63.213.182 21:01, 5 January 2007 (UTC)
 * Modern digital technology can easily compensate for irregularities in the blue screen or lighting. --Janke | Talk 18:03, 10 January 2007 (UTC)

Truematte
someone mentioned about grey mattes in the other colour section. the grey matte is actually Truematte. developed by the BBC it is very easy to use, provides exelent results and has no spill allowing for full artistic controll over lighting! the stuff is ace! it needs its own paragraph. if someone with some literacy skills would write something about it it would be nice. there is lots of information here http://www.bbc.co.uk/rd/projects/virtual/truematte/index.shtml —The preceding unsigned comment was added by 86.20.156.45 (talk) 01:50, 9 May 2007 (UTC).

question about an Invisible Man movie (1951)
In the Abbott and Costello film from 1951 where they meet the Invisible Man, was the special effect for transparency arrived at through black screening? Or was it done in some other way, as with a series of mattes?

As for superimposing one dimension over another, didn't black screening - that is, shooting in front of a wall that is painted completely black - predate the chroma keying of the 1970s? 198.177.27.26 07:43, 2 June 2007 (UTC)

Green, not blue?
Isn't the more common name for it the Greenscreen? I have never in my life heard it called the bluescreen. If there are conflicts with other pages anyway, why don't we just move it back to Green. It would make more sense, because this is the term that most people are familiar with. And I'm sure it can be called either one acceptably. So regardless of what we have pictures for or being "politically correct," I think we should go with the term everyone knows, not the one that confuses the heck out of people! └ Jared ┘┌ t ┐&ensp; 03:24, 22 June 2007 (UTC)
 * Bluescreen was the common name for it first, I'd say. Throughout the 80s and early 90s I doubt anyone would know what you meant if you said "greenscreen". I suspect you are young? :) 71.63.105.172 07:06, 6 September 2007 (UTC)

Other colors
At Disney, I saw a compositing studio where they were shooting Mary Poppins that was lit with orange sodium vapor lamps. Anybody know the details?Jim Stinson 23:03, 11 July 2007 (UTC)