[TYPO3-templavoila] how to render image - and get path - from php

[Erich Specht]

I have a Flexible Content Element that holds the info about an event (name,
date, image).  I'm rendering the content of the flexform in PHP as JSON,
however the image simply lists the file name with no path.  Is there a way
in PHP to size that image and get the path where the resized version exists?