DynamicPDF Generator for Java supports 6 common image types:

JPEG

JPEGs are handled natively through a highly efficient pass through process.

PNG

WMFs are converted to a bitmap for inclusion in a PDF document.

EXIF

PNGs are handled natively. If the PNG does not have an alpha channel (transperancy), it uses a highly efficient pass through process. If the PNG does have an alpha channel it is parsed and reformatted for inclusion in a PDF document.

JPEG 2000

JPEG 2000s are handled natively through a highly efficient pass through process.

GIF

GIFs are handled natively, but are parsed and reformatted for inclusion in a PDF document.

TIFF

TIFFs are handled natively and most types of TIFFs (LZW being the exception) use a highly efficient pass through process. Multi-page Tiffs are supported, allowing access to any page in a TIFF document.