I would guess you are talking about document printing.
Images are a pain to adjust - and accurate sizing is nearly impossible - but the Resize does work...
I can post a couple of how-to images if you need / want...
In my opinion:Documents are tough.
The only way I've found to deal with (giant print) documents is to open the content in (or copy the content to) a document editor (for example, Pages), adjust the document, including the font sizes - then save and print.
I've done it - it is painful but it does work.
I would guess there are other Apps available (from the Apple Apps Store) that handle this better - but I've not bothered since I do generally have access to a PC and printing at the desired size is just not an issue with the right tools...
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