HP PW550 - Manual (Page 86)

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PictBridge
The PictBridge function allows you to print images captured by your camera without
connecting the camera to a PC. Print images with a PictBridge compatible printer directly.
To activate PictBridge:
Connect your camera to a PictBridge compatible printer using the USB cable. See illustration
below.
Note
If the printer does not support date & time imprint, the date & time imprint function will be
disabled in PictBridge.