Chroma key. Bluescreen since 1940. Real-time tool wave from Ultimatte in 1976.
Typeface · Rubik
Chroma key principle: Shot, background and composite image: Example from 2010.Imyzc. CC BY-SA 3.0View source ↗
Prompt
Apply a vintage Chroma Key composite effect, separating the foreground with slightly hard matte edges and placing a flatter, independently lit rendering of the existing background behind it. Add restrained green spill, thin color fringes, minor edge chatter, and mismatched grain between layers. Keep the original subject and composition.
People or models appear in separately generated environments. [Errors are revealed by color fringing1].
Principle
A[background color acts as amask]. It [separates the foreground]so that another image can be placed behind it.
Example
Star Wars (1977): models filmed separately in front of abluescreen are combined.
Try it out
Compare the green image, the black and white mask, and the composite2. Check the hair, transparency, and light direction.
Background
Prehistory in the 1930s/1940s; refined color masks in the 1950s/1960s; important expansion phase of real-time technology from 1976 onwards.
Adefined background color is translated into amask. The mask separates the foreground and background; hair, transparencies, and color bleed are corrected at the edges. Then another image is inserted.
Star Wars (1977): separately filmed models in front of abluescreen; Ultimatte (from 1976) as an important real-time compositing milestone.
Regarding the image: Alater technical demonstration. On the left, the original image against auniform green background; in the middle, the clipping mask; on the right, the composite image on anew red background. This is alater demonstration, not an original from the 1970s.
Distinction
Blue/greenscreen is not synonymous with all compositing. Amask can also be painted, rotoscoped, or created using other methods. The 1970s classification refers to the wave of its widespread use and the development of the necessary tools. The Thief of Bagdad (1940) already employed an early bluescreen process; Ultimatte was founded in 1976.
Aftermath
Places and characters no longer had to coexist in front of asingle camera. News broadcasts, weather reports, music videos, and fantasy films became combinable visual layers.
Further examples · 9 images
02Sapporo Science Center, chroma-key game. (7033578845)A child stands on a blue floor in front of a screen showing an astronaut on a moon-like surface. This exhibits real-time technology where the blue environment is replaced by a computer-generated space scene.MIKI Yoshihito from Sapporo City, Hokkaido, Japan · CC BY 2.0 · Wikimedia Commons03Green screens compare with Iman Crosson 20110524Two panels compare a man in front of a green fabric with his likeness placed in a formal hallway. The composite demonstrates the placement of a separate foreground model into a new environment.Iman Crosson · CC BY-SA 3.0 · Wikimedia Commons04John Chroma key 1A man in a suit gestures in front of a green backdrop next to studio monitors. This shows a professional studio setup designed to isolate the subject for later digital background replacement.John Coleman · Public domain · Wikimedia Commons05Green screen 2000Dancers perform within a large green cyclorama room equipped with overhead lighting. The scale of the green environment allows for the movement of multiple models to be filmed separately for a composite.Yury Chernavsky at Russian Wikipedia · CC BY-SA 3.0 · Wikimedia Commons06Green screen chroma set-up studio (pup theater, pup ndc compound, anonas, santa mesa, manila)(2015-0715)A person stands in front of a small green screen on a stage with studio lights and shadows. The sharp shadow on the green surface highlights potential light direction challenges during the masking process.patrickroque01 · CC BY-SA 3.0 · Wikimedia Commons07ChromaKeyGreenScreenA man stands before a portable green screen in a room with a microphone and light. The distinct green oval serves as the specific color mask needed to isolate his form from the room.Unknown · CC BY-SA 3.0 · Wikimedia Commons08Boy Standing In Front of a Green ScreenA boy in a jersey stands before a draped green cloth in a domestic setting. This image shows the basic application of a color mask to separate a foreground figure from a static background.Tom Newson · CC BY-SA 4.0 · Wikimedia Commons09Green screen studio (25113564876)A person wearing a VR headset crouches in a corner draped entirely in green fabric. The setup allows for the real-time separation of the user to be placed into a virtual digital environment.Colin and Sarah Northway from Wherever, We find ourselves · CC BY 2.0 · Wikimedia Commons
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