How to print diferent sizes using Pictbridge on HP 7850

The camera compares its PictBridge functions to the functions of the printer. The camera then displays the supported functions on menus on the LCD screen or in the viewfinder.
PictBridge print options

Once a PictBridge digital camera is connected to a compliant printer, print options appear on the camera LCD. The camera menu system is used to make settings such as print size, layout, media type and date.

You can print a single image displayed on the camera, print two or more images or print all images on the memory card. You can print part of an image by first cropping it within the camera and even create index prints, also known as contact sheets.
Print sizes and PictBridge

Not all PictBridge digital cameras let you select all available prints sizes, such as 13×19? if you have a wide format printer. If the printer has a memory card slot, use it and larger size prints should be available.
Is your device PictBridge compatible?

To find out if a camera or printer is PictBridge compatible, look for the PictBridge logo on the packaging or check the manual for specifications. If still unsure, call the manufacturer!