Powerpoint pictures and optimum image file size

  astronomer2 09:47 03 Oct 2003
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I'm having some problems with a PPt presentation containing image-processed very high resolution pictures. They look as though they are very LOW res when projected via a digital projector, as though the slide was very transparent and the projector lamp too bright. The combined file sizes of the 70 or so pictures is 500Mb but when saved as PPt on CD the total PPt file is only about half of this. Does PPt have very lossy file compression built in?

Using Photoshop to prepare the BMP and JPeg images, is there an optimum image size and dpi recommended for images to be digitally projected via Powerpoint? My images are currently a mix of 8x10 at 72dpi down to 2x3 at 2400dpi, plus many variations in between. Other presentations containing smaller image files have come out OK.

  Pesala 00:55 04 Oct 2003

If your presentation is designed for a projector that works at 800 x 600 all images should be resized to suit that, or 1024 x 768, as appropriate.

DPI is irrelevant here - its pixels you want to know about. 2"x3" at 2400 dpi means 4,800 pixels x 7,200 - six times more detail than can physically be displayed by many projectors.

Irfan View click here will batch resize images to common screen resolutions like XGA or SVGA.

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