Canon EOS-1D MARK III Instruction Manual page 24

DirectPrintingfromthe Camera/
DigitalPrintOrderFormat
You can connect the camera directly to a printer and
print out the images in the memory card.
The camera is compatible with ",P_ PictBndge" which is
the standard for direct printing.
You can also specify any images in the memory card to
be printed. (p.147)
About DPOF
DPOF (Digital Print Order Format) is a standard for recording printing
instructions (image selections, quantity to print, etc.) in the memory
card. In this way, you can print multiple pictures in one batch or give the
print order to a photofinisher.
Canon!s
PictBridge Web Site
The Web site below gives more information on using your
Canon camera with various printers, such as which paper
types to use.
http:flcanon.com/pictbddge/