What is a transfer curve and what does pre-flight mean when it says "transfer curve used"?

What is a transfer curve and what does  pre-flight mean when it says "transfer curve used"?

http://dx.aip.org/advisor/transfer_curve.html has some insight.
Basically, someone who prepared the PDF or an image in it used a magic trick that could cause it to print differently from how it is on screen.

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    PIN: C0005A9AA   Display/Scan Bar Code

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