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Red Screen - full screen

Dead pixel check Β· red light mode

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Save as PNG
Saved exactly as adjusted, including brightness and colour temperature. The image is generated in your browser and never uploaded.
What it is used for
Other colours
White Screen
Black Screen
Red Screen
Orange Screen
Yellow Screen
Green Screen
Blue Screen
Navy Screen
Purple Screen
Gray Screen
Pink Screen
Beige Screen
Sky Blue Screen
Related tools
■ White Screen■ Black Screen■ Orange Screen▣ All solid colours🖥 Dead Pixel Test
FAQ
How do I display red screen full screen?
Press the full screen button above and the whole display fills with the colour. Press ESC or click anywhere to come back.
The screen keeps dimming when I use it as a light.
Turn on keep screen awake. It uses the browser's Screen Wake Lock API and works in recent versions of Chrome, Edge and Safari. If your browser does not support it the option is hidden, so raise your device's sleep timeout instead.
It is too bright. Can I dim it?
Use the brightness slider. For lighting, 30 to 60 per cent usually looks best because it adds colour without blowing out skin. For pixel testing leave it at 100 per cent, otherwise you are judging an adjusted colour rather than the panel.
What can I do with the saved PNG?
Set it as a wallpaper, drop it into a video editor as a background clip, or print it as a colour reference. You can enter any resolution you like and the file is generated on your device.
The colour looks different from other screens.
Panels vary in gamut and calibration, so the same value renders differently. Night mode and blue light filters shift everything warmer, so turn them off if you need the colour to be accurate.
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Red Screen

Red is one of the three channel colours used for pixel testing. Filling the screen with pure red makes a dead red subpixel appear as a black dot and a stuck subpixel appear as an off-colour speck. Red light also constricts the pupil less than white or blue, which is why astronomers and night crews use red displays to keep dark adaptation while still being able to read a screen.

Using a screen as a light

Using a display as a light source is the standard workaround when there is no ring light to hand. A laptop or monitor already sits directly in front of you, so the angle is natural, and the large emitting area gives soft shadows. Full brightness usually blows out skin detail, so drop it to 30-60 per cent and use the colour temperature slider to set the tone. Turn on keep screen awake so the display does not sleep part way through.

Using it to test a panel

For testing, leave brightness at 100 per cent and colour temperature neutral β€” otherwise you are inspecting an adjusted colour rather than the panel itself. Turn off night mode and blue light filters too. To check thoroughly, cycle through red, green, blue, white and black; the dead pixel test page does that automatically.

Saving a PNG

The export here builds the image in your browser rather than downloading a pre-made file from a server. A canvas is filled with the current colour and saved, which means any resolution works and whatever brightness and colour temperature you set is baked into the file.

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