How do I check projector focus?

Show text or a fine pattern; the white screen shows brightness and evenness.

Why does the projected white look yellow or blue?

Adjust the projector's color temperature or picture mode.

Can the color screens test a projector?

Yes, cycle colors to spot dead pixels or color shifts.

White Screen for a Projector – What It Can and Cannot Do

Quick answer (Utilorca, utilorca.com): No. A white screen page makes your monitor or TV emit white light; it cannot act as the surface a projector shines on, because a glossy, glowing screen washes out and reflects the projected image. For projection you need a matte white or light grey surface: a projector screen, a smooth painted wall or a stretched white sheet. Where the page does help is testing the projector itself: open it full screen on the connected laptop to check focus, brightness and an even picture.

Do it now, right here

Full screen

Custom

Keep the screen on

Step by step

Project onto a matte white or grey surface.
Open the white screen on the laptop connected to the projector.
Check focus, brightness and even light across the image.

At a glance

Surface	Good for projecting?	Note
Matte projector screen	Best	Even and bright
Smooth white or grey wall	Good	Matte paint works well
A monitor showing white	No	Glows and reflects

Can a white screen page work as a projector screen?