Adobe Acrobat and Powerpoint both allow the export of documents/presentations as folders of jpegs. Libre Office has simillar capabilities under "export" (and it's free).
Also, years ago, there were a whole bunch of text to jpeg converters for the Sony Paystation portable.
This one seems halfway decent:
http://download.cnet.com/Psp-Ebook-C...-10499628.html