Turn your entire screen pure yellow with one click. Yellow is red and green at full power with blue switched off, which makes it good at exposing stuck blue sub-pixels and red-green imbalance, and a bright warm light.
F for fullscreen, Esc to exit
Blue is off across the whole field, so a blue sub-pixel stuck on shows as a pale or white dot against the yellow.
Yellow is an even mix of two channels. A panel or setting that favours one of them pushes the field toward orange or toward lime.
Yellow is nearly as bright as white, so it makes a strong warm light for photos and a cheerful wash for backgrounds.
Check how a high-visibility yellow reads on a given screen before committing to it for a sign or slide.
Green carries most of what your eye reads as brightness, and red adds most of the rest. Yellow has both at full power, so it looks close to white while leaving the blue sub-pixels dark. That combination is exactly why a stuck blue sub-pixel stands out on it.
Written by Piero Nanni. If a panel of yours behaves differently, tell me and I will correct it. Updated .
The same #FFFF00 field as a PNG, for a wallpaper, a slide or video background, or a TV that plays images from a USB stick. Made in your browser; nothing is uploaded.
Any other colour: use the picker on the homepage.