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Units used for position and rir_position

Hi,
I wonder how are calculated units for output document (after processing) for fields: position and rir_position?
Can you point to some documentation, how they are calculated from original file?
I've tried to find some documentation on this topic, but with no success.

If files (pdf, jpg, png, ...) are always converted and normalized first?
They how they relate to original pixels?

Thank you in advance for clarifying this topic.
Best,
Marcin