[OS X TeX] preferred tool for presentations : pdf transparency

[Frédéric Dupont]

Hi,

I usually work with (new)pdftricks.

Lately, I try to create a presentation with pdfslide using pdftricks.  
All is OK but ... my graphics are not transparent. It's very  
unpleasant to see these white backgrounded pdf graphics on the  
overall (for example) pinky background of the slide.

When I drag my pdf graphic on a Keynote slide, his background is ...  
transparent.

Is it possible to get transparent backgrounded pdf graphics  with TeX/ 
LaTeX presentation tools ?

Sincerely

-fd

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