Videos look dark displayed using projector, but OK in my laptop?

this one seems to be a common problem. I have been lecturing in several medical meetings and when colleagues show embedded videos in their presentations, they look very dark. Sometimes they are so dark that miss completely the point. I have had the same problem, to the point where I have had to skip a slide with video because it is so dark that it cannot be seen on the main projector screen. The curious thing is that in my laptop screen they look fine when I am presenting... but very dark when they are projected. Any ideas to solve this problem? Thanks in advance!

I don't have the same problem (i.e. videos too dark) but I'll bet it's the same solution. My problem was that the Keynote presentation on the LCD were way too dark. Funny thing was that if I opened up the systems preferences dialog box, they looked fine. Hummm.
Turns out that it was an issue with a change in the latest OS and how apple now handles the gamma setting in external displays. I don't recall all the details but Snow Leopard seems to use the new standard gamma of 2.2, making output too dark. The output gamma should be closer to 1.8.
To fix this, you need to adjust the color profile for the LCD projector that you are using.
To fix a projector, the projector must be plugged in and turned on to do this.
If you go to System Preferences, Displays and the Color option. You'll see a list of Display Profiles. There will be a dialog box on both the computer screen and the projector screen. To get them both on the computer screen to make editing a little easier you can click Gather Windows at the bottom of the dialog box on the computer.
I found it easier to just Calibrate the monitor and same a new profile - you can also uncheck the Show profiles for this display only and pick another profile like one of the sRGB profiles. To calibrate, click the Calibrate button (be sure you do it on the dialog for the LCD projector) I'd click Expert Mode - this will give you more options when adjusting the Gamma. Run through the Calibration routine making sure that you select a Gamma that is closer to 1.8 instead of the 2.2.
At the end, same the profile and then everything on the external display should look much better.
When researching my issue, there seemed to be consensus that using a digital interface the projector was better than the normal VGA cable. Didn't have a cable to try that.
Once you do this, the machine should always recognize the projector and behave properly. Seems a pain to have to do this but I didn't find any other alternative. The good thing is that I have not had to do this on every projector that I use. I have my own projector that has always worked properly.
I teach at a university where the rooms have mounted projectors - some work with no change, others I have to calibrate...
Try it out, hope it helps...

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