Hip deep in reading about DrawingML and what do I find but non-sense like this:

Coordinates are measured in EMUs (914400 EMUs per inch), and can be positive or negative.

Do you know what you have to do to figure out if an image embedded in a PowerPoint file has been scaled or not? Harder than it should be.

1- Unzip the PPTX
2- Find the images
3- EMU = image dimensions X DPI X 914400
4- XPath slide[\d+].xml files for <a:ext > and see if the cx and cy EMUs are less than the dimensional EMUs.

grrrrr...

EMU == Crazy