JPEG Compression
PDFDevice enables the developer and user to control the level of image
compression allowing a careful balance to be struck between image quality and
overall file size.
Strip duplicate images
This option causes PDFDevice to compare and strip duplicate images from the
final output. This can dramatically reduce the file size if, for example, a
report uses images in page header sections that are repeated on each page.
Pict/Meta handling
Macintosh Pictures and Windows Meta files cannot be directly embedded in PDF
files and have to be converted to JPEG images or run-length encoded RGB based
image data. Because Pictures and Meta files are endlessly scalable, when
converting such images, a loss of quality is inevitable. However, PDFDevice
provides an option to specify a conversion DPI which is not limited to the
screen resolution and which enables the developer or user to strike a balance
between quality and final file size.