pyascii85 is a Python extension written in C, that provides Ascii85 data encodings, also known as Base85. It can encode and decode files or text buffers, and is useful for encoding data to be used within PostScript and PDF files, such as raw RGB images.
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 and then collating the images in a device-specific format.