The green screen (or chroma key) lets you replace the background with any image or video: a set, a landscape, a virtual stage. It's the foundation of the modern studio, from content creator to professional shoot. But a clean composite is mostly decided at the moment of capture. Here's how to get your green screen right first time.

Why green (and not another colour)?

Green is chosen because it is far from skin tones and because digital sensors are very sensitive to it: the software isolates that colour easily. Blue exists too (useful if the subject is wearing green, or for skin), but it needs more light. Simple rule: green by default, blue if your subject contains green.

An even green is 80% of the job

The composite fails when the background is uneven: lighter patches, darker patches, creases, reflections. The secret is uniform lighting of the background, kept separate from the subject's: two sources on each side, aimed at the background, for a perfectly flat sheet of green. A matte backdrop, free of creases, takes the light evenly: that's exactly what you want.

Move the subject back to avoid "spill"

Spill is the green that bleeds onto the subject's edges (hair, shoulders) and complicates the cut-out. The fix: keep the subject at least 1.5 to 2 metres from the background. If you can, add a rim light (behind the subject) to separate the silhouette cleanly. Avoid green or very shiny clothing.

Photo/video settings that make the cut-out easier

  • Exposure: a well-exposed background, neither blown out nor dark; aim for a bright, solid green.
  • Sharpness: the subject sharp, the background can be slightly soft: it helps the algorithm.
  • Low ISO: less noise = a cleaner cut-out (grain "bleeds" at the edges).
  • Fixed white balance: no auto, so the green stays constant from one frame to the next.

Which material and size of green screen?

Favour a matte material (no reflections): green fabric is light and portable, green vinyl can be washed and also works as a floor for full-length filming. As for dimensions, plan generously: the backdrop must extend beyond the subject in the frame, with room to move. We help you choose in our article Which backdrop size to choose. With us, every green screen is printed to order, in the exact material and size you need.

Frequently asked questions

Can you do green screen without a studio?

Yes: a well-tensioned panel of green backdrop, two lamps to even it out, and some distance from the subject are enough at home.

Why does my composite keep green edges?

That's spill: move the subject away from the background, add a rim light, and use your software's "despill" tool.

Should a green screen be matte or glossy?

Always matte: gloss creates bright reflections that are impossible to cut out cleanly.

Green or blue?

Green by default. Blue if the subject is wearing green, or for a softer result on skin tones.

Need a flawless green screen? Choose the material and size down to the centimetre in our custom backdrop creator, or discover our ready-to-print backdrops.