When Was Green Screen Invented?

Green screen tech, or chroma keying, has become a staple in film and video production.

It allows filmmakers to stitch together different images to create scenes that look true to life. 

This tech has come a long way, evolving from basic camera tricks used over a century ago to the sophisticated digital effects we're familiar with today. 

When was green screen invented?

Green screen grew out of blue screen. The blue-screen method was developed in the 1930s at RKO Radio Pictures, and the first proper blue-screen traveling matte was created by Larry Butler for The Thief of Bagdad (1940), which won the Academy Award for Best Special Effects.

Green backdrops came later. In the early 1970s, American and British television networks began using green instead of blue for their newscasts, and green is now used for TV and digital video more than any other color.

Who invented the green screen?

No single person invented it. Larry Butler is credited with the first true blue-screen shot in 1940, RCA used "Chroma-Key" as the trade name for the process on its NBC broadcasts from 1957, and Petro Vlahos received an Academy Award in 1964 for refining the technique. The Wikipedia history of chroma key covers each step.

The early days of green screen

In the beginning, filmmakers used basic methods like double exposure to create special effects. This meant capturing two different images on the same piece of film to create an illusion. 

For example, George Albert Smith experimented with something known as parallel action in 1898 and Edwin S. Porter with cross-cutting in 1903’s The Great Train Robbery.

Both used these techniques to add new elements to their films, like creating the illusion of a moving train, as you can see below:

As these methods developed, new techniques were invented to improve the filmmaking process. In 1918, Frank Williams introduced black matting.

In the 1920s, Walt Disney began experimenting with filming on a white background and then adding animations later. These were steps toward what would become green screen tech.

Developing better techniques

Over the years, filmmakers created several methods to make combining images easier and more realistic:

• Bi-pack Method: This early form of green screening involved filming an actor in front of a second, previously filmed background, like a castle or a landscape. It was a straightforward way to combine images but limited how the actor could interact with the background.
• Williams Process: Patented by Frank Williams in 1918, this traveling matte filmed actors against a black background so they could move in front of a different background. It was used in films such as The Invisible Man (1933).
• Dunning Method: Developed in 1925, this method added a yellow light during filming to separate the actor from the background better.
• Sodium Screen Process: Developed further by Disney and Petro Vlahos, this technique used a type of light that made it easier to separate the actor from the background. It was famously used in Disney’s Mary Poppins in 1964.

The move to digital

Computers changed how these shots were made. During the 1980s, minicomputers controlled the optical printers that combined an actor filmed against a blue screen with the background footage, one frame at a time.

For Star Wars Episode V - The Empire Strikes Back (1980), Richard Edlund built a "quad optical printer" that sped the process up and saved money, earning him a special Academy Award.

The 1990s introduction of digital cameras made green screen tech more accessible to everyone, not just pro filmmakers. Today, green screens are used everywhere—from big blockbuster movies to daily TV news broadcasts.

With modern apps and editing software, anyone can use this tool. Software like Adobe After Effects and Final Cut Pro offer chroma keying features, making it easy to replace green backgrounds with any scene you want.

These days, even mobile apps come with these features, letting you create visual effects straight from your phone. And if you'd rather skip the chroma keying altogether, Tella has a free library of animated backgrounds you can drop behind your screen and camera in one click.

Why did they change from blue screen to green screen?

Television made the switch first, for practical reasons:

• Clothing: weather presenters often wore blue suits, which disappeared into a blue key. Green clothing is less common, so a green screen was easier than policing what on-air talent wore.
• A cleaner signal: the human eye is most sensitive to green, and the green channel of analog video typically carried the strongest signal, so green screens produced the cleanest keys.

Blue screen stayed the norm in film for longer because film compositing was done chemically, printing the negative so that only blue areas stayed clear. Today both are used, and the rule is simple: pick the color that doesn't appear in your subject.

Did they have green screens in the 70s and 80s?

Yes, mostly on television. TV networks started using green backdrops for newscasts in the early 1970s. Films from the 1970s and 1980s, including the original Star Wars trilogy, mainly used blue screens combined on optical printers.

Looking ahead

Green screen tech has changed how we make movies and videos. And, as tech moves forward, we can expect even more sophisticated tools that will make creating realistic visual effects even easier. 

If you make videos, you might want to try using Tella. It helps you easily edit and customize your videos, making everything from tutorials to product demos look great without a lot of hassle. Using tools like Tella can take your video projects to the next level.