Re: Set custom slide size

Hi,

I want to modify the size of the individual slides in a PowerPoint presentation.

I've been using presPart.Presentation.SlideSize.Cx = .

What kind of units is this number in? My question then is, if I know in pixels or inches how large I want the slide to be, how do I convert this to whatever number is actually being stored in the xml?

Thanks,

Nathanael

Hi,

Units of the size in open XML is EMU (English Metric Units). And you can convert those to pixels with following formulas.

pixel=EMU * Resolution/914400;

where "Resolution" is resolution of your screen. e.g. 96 dpi etc.

For more details go through below link.

http://polymathprogrammer.com/2009/10/22/english-metric-units-and-open-xml/

In general, use these formulas:

1. EMU / 12700 = pixels
2. pixels * 12700 = EMU
3. inches * 914400 = EMU
4. EMU / 914400 = inches

These formulas work well with the default numbers used in the PowerPoint client - especially images which are usually sized for 72 dpi, regardless of their internal dpi or the dpi of your screen. In other words, the way a PowerPoint creates a slide is for printing first, secondarily for on-monitor-display so print ppi/dpi does actually matter.

So in the case of your question above, if you want your slide to be 10" wide (SlideSize.Cx), you would set it to 9144000 (=10 * 914400) using #3 above.