Projector vs monitor color check for classrooms and meeting rooms

Open the tool on the laptop that drives the projector. Then open it on a second device, such as a phone, a tablet or another computer. If the projector mirrors that laptop's screen, the laptop's own screen can serve as the second device. You're then comparing the laptop panel with its own projection. Create the session on one device and join from the other by typing the 4-character code or opening the share link. Put the tool in full screen so the color fills the display, then start with the yellow page color. Next, move to a mid gray and then to a white. Use the small toggle in the bottom left corner to open the controls when you need to change the color.

A projection is seen in room light, on whatever wall or screen is there, so the light and the surface both change how the color looks. Compare the yellow first. If it looks greener, paler or duller on the projection than on the laptop, the room or a projector setting can be the reason. The grays show whether the projection leans warm, cool or dim next to the laptop, and the white shows overall brightness and tint. Some changes help. Dim the room if you can, set the projector's picture mode to a standard one and keep it for every check, then sit where the audience sits and look again, since that's the view your audience gets.

Nothing here is measured. The tool can't read the light on the wall or see the room, and it can't say whether the projection is right. Each device gets the same color values, and you judge the match by eye. Real measurement needs a hardware colorimeter (also called a calibrator or spectrophotometer) with its software.