help please projector image leaves ghostly residue in slideshow

[treason show]

I use a projector and macbook pro for my comedy show. But in the slideshow there is a ghostly image left on the screen inbetween slides. It seems to be an imprint of a previous slide leaving a faint (But annoyingly visable) residual watermark type image.
Anyone have any ideas on how to fix this?
I've tried using Keynote, same problem.
Tried using different projector, same problem.
Tried different cable, no change.
It seems to be the macbook pro but I have no idea on how to fix it.

Cheers

Mark
The Treason Show

 

[arjen92]

How are the transitions made? Is it a fade (which will explain the ghost effect 😛). Or is it just a hard cut, one picture and then the other, like snap.

Maybe it is your projector. With screen and games, the ghost effect is common with slower screens. It means that the screen takes a few moments of time to go from one colour to another. Sometimes they measure it with white to black, and sometimes with grey. What the problem could be is, that both projectors aren't fast enough changing colour.

Maybe you can give more information (is it a dlp or lcd projector for example)