For current version with source (PDFRead 1.8.2) see http://www.mobileread.com/forums/showthread.php?t=21906 (at mobileread.com)
This includes major changes.
See http://pdfread.sourceforge.net/#changes for more details.
PDFRead is a tool for converting PDF and DJVU documents for reading on eBook devices. It does this by creating an image out of each page, enhancing the image further and then collating them in a device-specific format.