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Are there any additional options for reducing the size of a Powerpoint presentation without losing image quality?

I've got a deck that is approximately 25 slides, 15 of which have images. The deck ends up being over 25 MB. I would like to possibly cut that in half.

Any suggestions would be appreciated.

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Do you you have Photoshop available? – JohnB Nov 28 '12 at 23:36
Do you know the resolution (ppi) of the images? – Scott Nov 28 '12 at 23:49

You won't have much luck. PPT doesn't seem to be very efficient with it's file size in my experience.

That said, I've been able to bring file size down on a good day by applying the same principles you would for a web page. Optimize the images as best you can and then reimport them. The quality is completely relative so push the limit on compression based on your end use.

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Your biggest problem are scaled pictures. Resizing the images before embedding them into your Powerpoint to the final size can make a big difference. And while you are at scaling you could try out jpg compression, but there will always be a certain loss of quality.

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