A pure green screen to check the green subpixels, find dead pixels or use as a green backdrop for small product shots.
When time is up, full screen closes on its own.
Put a white or warm screen in front of you and turn up the brightness. It lights your face softly, like a ring light.
Black shows dust, white shows smudges. Use both and nothing gets missed.
Cycle through red, green, blue, white and black. A dot that doesn't change color is a dead or stuck pixel.
A soft color at low brightness works as a night light or for reading without turning on a lamp.
To test the green subpixels and spot dead or stuck pixels. Also as a green backdrop for photos of small objects.
For small objects, yes, with the screen behind them. For people you need a larger, evenly lit green cloth or panel.
It's pure screen green, #00FF00. You can pick another shade with the color picker.