In a few words...
Rendertext processes text and html documents and produces image files which can be used to read these documents. This is the overall process:
Text files:
- Clean text
 - Uniformize text
 - Render it as a series of images
 
HTML files:
- Clean html
 - Interpret html
 - Convert html to rich text with images
 - Render it as a series of images
 
              
              

