Red Screen
Click the button below to open a fullscreen red screen. Press Esc to exit.
Shortcuts: F or Space — fullscreen · W white · K black · R red · G green · B blue
Uses for a red screen
Dead pixel testing
Reveals stuck green or blue subpixels invisible on white or neutral backgrounds.
Night vision lighting
Red light preserves dark-adapted vision — used by astronomers, military, and photographers shooting at night.
Photography backdrop
Bold red background for product photography, portraits, and creative studio setups.
Ambient mood lighting
Warm red glow for concerts, parties, film sets, or any low-light environment.
Frequently asked questions
- Why use a red screen for dead pixel testing?
- A red screen reveals stuck green or blue subpixels. If a pixel cannot display red, it will appear as a green or blue dot against the red background — defects that are invisible on a white screen.
- Why does red light preserve night vision?
- The human eye's rod cells — responsible for low-light vision — are least sensitive to red wavelengths. Using a red screen as a light source at night keeps your pupils adapted to the dark, unlike white or blue light.