[Bruzilla]

Sounds like you were projecting directly on to the glass. You're supposed to place a screen in front of the glass, usually a frosted or white shower curtain liner works best. This makes the image look better from the outside and prevents any reflection. I've also found using a white shower curtain liner also prevents anyone from being able to see the projector bulb better than a frosted curtain.

 

[Bruzilla]

Not sure what you were trying to do. If you were trying to project the image onto the window so it appears from outside you need some type of scrim covering the inside of the window, you can't just project onto the glass.

You can project directly onto glass and it will be visible from outside, but the image isn't nearly as bright or defined as it is with a screen, plus you get the noted reflection issues and you can easily see the projector itself if you're at the right viewing angle.

 

[Bruzilla]

We tried using a frosted shower curtain liner last year and it was okay. We went to a white one this year and it worked better at hiding the projector from view.