Photos in quicktime -- image quality degrades significantly

Hi ... I am attempting to create a slideshow. Images are currently in iPhoto.
I read that the best presentation quality for the images would be achieved creating a slideshow in iPhoto and exporting the show. Then open the show in Quicktime.
When I play the resulting show in Quicktime Pro, the images have degraded significantly.
Am I missing a step in here someplace?
The final show will be played on a large screen.
Thank you in advance.

I tried saving as a png, but I got the same result. It's like
my black becomes a dark grey and my midtones go light/
white.

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