Green Screen Dead Pixel Test
A green screen reveals dead pixels as black dots, and shows stuck red or blue sub-pixels clearly. Stuck green sub-pixels blend into this background — use red or blue screens to find those.
Green screen test
Look for black dots (dead pixels) and any red or blue dots against the green background. Go full screen for the most accurate result.
Press F11 for best results on desktop
What each dot type means on a green screen
| What you see | Type | Action |
|---|---|---|
| Black dot | Dead pixel (transistor off) | Document and check warranty |
| Red dot | Stuck red sub-pixel | Try the fix tool |
| Blue dot | Stuck blue sub-pixel | Try the fix tool |
| Nothing unusual | No detectable defect on green | Also test black & white |
| Green dot hiding | Stuck green (invisible here) | Test on red or blue screen |
Test on other colors too
Each color hides one type of stuck pixel. A complete test uses all seven colors.
Run the full 7-color dead pixel test →Frequently asked questions
What does a green screen dead pixel test reveal?+
Dead pixels (black dots), stuck red sub-pixels (red dot on green), and stuck blue sub-pixels (blue dot on green). Stuck green sub-pixels blend into the background — use red or blue screens to find those.
Why do green sub-pixels matter more?+
The human eye is most sensitive to green light. A stuck green sub-pixel is the most visually disruptive type on all other colors — it shows clearly on red, blue, and black backgrounds.
Is this the same as a chroma key green screen?+
No. This test displays a solid green background on your screen to check for pixel defects. A chroma key green screen is a physical filming backdrop. This is a display test only.
What should I do if I find a dead pixel on the green screen?+
Verify it is dead (not stuck) by checking it on the black test — dead pixels are invisible on black, stuck colored dots appear on black. Dead pixels cannot be fixed with software. Document and check your warranty options.