Lion Preview Slideshow actual size possible?

i use slideshow feature of preview in osx lion display images , documents. many of these documents smaller native resolution on 27" display.

there way make preview display images / files in actual pixels rather stretch them fit screen? many smaller images stretched fill screen. know can use lightroom or iphoto, preview simple select , click operation...much more convenient. in slideshow mode, , not in full screen mode.

help!

 

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