best image format for pdf question

Todd Hamilton <netarttodd-/[email protected]>
Newsgroups gmane.comp.lang.perl.modules.pdfapi2
Message-ID <[email protected]>
I am scanning images (which are patient documents) and
placing the images in a pdf I create with pdf::api2. 
Is there an image format that would work the best? 
Ive tried jpeg, tiff, and png.  They all work fine. 
But I was wondering if there is a "native" format that
pdf uses?  Not native but a format the pdf likes best.
Todd


       
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