Color issue on projector

Hello, I don't have anything magical in my hat, but make sure to check the lamp's duration, readjust to optimum settings, and also look at the source, the quality of the film. Do a test with a colorful cartoon.
Make sure the room is dark.
Finally, check with customer service (obviously).

Hello
I greet our friend Glandu in passing and point out to Fabrice that (it's a possibility) the projectors have well-hidden menus, and in these menus to be discovered, there are settings like on a television for brightness, contrast, etc. But as Glandu says and also from personal experience with some projectors, you need to make the room almost dark, especially if the device is a bit old.
Cheers and happy projections