Green screen
A pure green field across the whole screen. Green is the channel your eye judges brightness by, which makes it the most revealing of the three primaries for uneven panels, and the most useful for spotting a failed sub-pixel.
The test
The full screen field needs JavaScript to run. Everything below still explains what this color reveals, so the page is useful either way.
Green screen, full screen
Fills the entire screen with nothing else on it. Press back or escape to leave. On a television, open this page in the set's own browser and drive it with the remote.
What this field reveals
A dark dot on green points at a failed green sub-pixel. Confirm across the full sequence in the dead pixel test.
Green shows blotches and banding most clearly of the three primaries; the uniformity test puts it next to the grays.
A green cast on what should be neutral shows up when you compare this field with the white screen.
Usable as a simple green backdrop, though a TV panel is not an even enough light source for serious chroma keying.
Quick answer
A green screen test drives only the green sub-pixels at full output. Because human vision takes most of its brightness information from green, unevenness and blotches show more clearly on a green field than on red or blue. A dot that stays black on green has a failed green sub-pixel. This page fills a television screen with green; it is not a chroma key studio backdrop, though it can serve as a plain green background at a pinch.
The other full screen colors
Each color exposes a different kind of fault:
Keep testing
Dead Pixel TestOr jump straight to another test:
Questions people ask
What is a green screen test used for?
To drive only the green sub-pixels, which reveals a failed green sub-pixel as a dark dot and makes panel unevenness easier to see. Green carries most of the brightness information your eye uses, so blotches and banding stand out more here than on red or blue.
Can I use this as a chroma key green screen?
Only roughly. A television panel is not evenly lit enough for clean keying, and the green it produces is not the standard studio green. For a quick test or a casual background it is fine; for real work use a proper cloth or paper backdrop.
Why does my screen look blotchy on green?
Solid fields expose panel unevenness that mixed content hides, and green shows it most. Mild blotchiness is common on LCDs. If it is strong, or you can also see it during a football match, the uniformity test will confirm how serious it is.
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