Blue Screen Test
A pure blue full-screen serves as an alternative chroma-key backdrop and reveals stuck or dead pixels on the blue subpixel. Click to go fullscreen, and press Esc to exit.
Click the button to fill your entire screen with solid blue. Click anywhere or press → to cycle colours, and Esc to exit.
Blue for chroma key
Blue is the classic chroma-key colour used in film before green took over. It is still the better choice when your subject wears green, and it produces less spill on skin under some lighting. A full blue screen on a monitor or tablet gives you a quick blue backdrop for compositing.
Stuck pixel check
The blue subpixel is the dimmest of the three and the one most prone to being stuck or dead, so a blue field is a valuable pass:
- A dead blue subpixel shows as a small dark dot on the even blue.
- Pixels stuck on red or green pop against the blue.
- Because blue is dim, uniformity problems and mura (cloudy patches) can be easier to spot here.
Not to be confused with the Windows BSOD
This is a display test, not the Windows "Blue Screen of Death". If your PC crashes to a blue error screen with a stop code, that is a software or driver fault — this tool simply fills a working screen with solid blue so you can inspect the panel.
Finish the check
Combine blue with red and green for full subpixel coverage, then white and black. Run everything at once with the full dead pixel test.
Frequently Asked Questions
What does a blue screen test reveal?
Stuck and dead pixels on the blue subpixel — the dimmest and most failure-prone of the three — plus pixels stuck on red or green that stand out against blue. Cloudy uniformity issues are also easier to see on blue.
Is this the Windows Blue Screen of Death?
No. This is a display test that fills a working screen with solid blue to inspect the panel. The Windows blue error screen is a software or driver crash and is unrelated.
Can I use blue as a chroma-key background?
Yes. Blue was the original chroma-key colour and is still preferred when the subject wears green. A full blue screen on a monitor or tablet gives you a quick backdrop for compositing.
Why is the blue subpixel more likely to fail?
Blue subpixels are the dimmest and are driven differently, which makes them statistically more prone to being stuck or dead. A dedicated blue pass catches those faults.
How do I exit the blue screen test?
Press Esc to leave fullscreen, or click to cycle to the next colour. Pick any colour with the buttons before going fullscreen.
Should I run the full dead pixel test?
Yes. Blue is one colour pass. The full dead pixel test runs red, green, blue, white and black in sequence so every fault is covered.