I have had lots of problems clipping pictures. I am surprised that you have not been having problems with your pictures being inside a large white border (the size of the powerpoint slide).
I didn't know you could use EMF. How do you convert it to PS?
What I do is print the picture to a postscript printer but use the "save as file" option. This produces a PS file. THen run this through Ghostview and save as EPS (with automatic cropping). I get the best results when I have a PowerPoint slide embedded inside a Word document!
The Ultimate Honda
1 week ago