> What are the sizes I'm specifying when I make a size request?
They are rather arbitrary; in the end, you only ask for a smaller or
bigger font size, nothing more.
> Somehow they must relate to the final size but I'm not sure how.
Wojciech gave you some links which you might read for more (thanks!):
You simply can't deduce the final pixel dimensions from the requested
size.
Werner
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