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A friend sent me a PDF with a UI mockup claiming it is 1024x768.
It is, indeed:

PDF size

However, View > Actual Size (0) zooms in so much that the PDF takes up almost all 1920x1200 screen estate that is available.

How do I view the PDF at its original size?

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up vote 2 down vote accepted

Turns out, there's a Preview preference that controls what actual size actually means:

enter image description here

If you want points to correspond directly to physical pixels, choose the first option.
(Not sure how it affects Retina displays though!)

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