Green Screen Test
A pure green full-screen works as an instant chroma-key backdrop and reveals stuck or dead pixels on the green subpixel — the one your eye notices most. Click to go fullscreen, Esc to exit.
Click the button to fill your entire screen with solid green. Click anywhere or press → to cycle colours, and Esc to exit.
Green as a chroma-key backdrop
Green is the standard chroma-key colour because it is far from human skin tones and because camera sensors capture the green channel at the highest resolution. A phone or tablet showing a full green screen makes a pocket-sized backdrop for cutting yourself out in video software, or a fill of even green light behind small objects. For a large backdrop, put a bright green fullscreen on a spare monitor or TV.
Stuck pixel check
The green subpixel is the one your eyes are most sensitive to, so faults show up clearly on a green field:
- A dead green subpixel appears as a small dark dot on the uniform green.
- Pixels stuck on red or blue stand out sharply against green.
- Uneven or banded green can indicate a weak green channel.
Why green matters most
Because human vision peaks in the green part of the spectrum, panels devote extra attention to green and your eye catches green faults faster than red or blue ones. That makes the green pass a sensitive test for subtle pixel and uniformity problems.
Finish the colour passes
Pair green with red and blue to map every subpixel, then check white and black. The full dead pixel test runs all five in sequence.
Frequently Asked Questions
Can I use this as a green screen for video?
Yes. A full green screen on a phone, tablet or spare monitor works as a small chroma-key backdrop. Green is used because it is far from skin tones and cameras capture it in the most detail. Light it evenly for the cleanest key.
What does a green screen reveal on my display?
Stuck and dead pixels on the green subpixel, which your eye notices most, plus any pixels stuck on red or blue that stand out against the green. Banding shows a weak green channel.
Why is green used for chroma key instead of blue?
Green is farther from human skin tones and camera sensors record the green channel at higher resolution, so it keys more cleanly. Blue is still used when a subject wears green.
Why do green pixel faults stand out more?
Human vision is most sensitive to green light, so your eye catches faults and unevenness on a green field faster than on red or blue.
How do I exit the green screen?
Press Esc to leave fullscreen, or click to move to the next colour. Use the buttons to jump to any colour before going fullscreen.
Should I also run the full dead pixel test?
Yes. Green is one colour pass. The full dead pixel test cycles red, green, blue, white and black so no stuck or dead pixel is missed.