Samsung gx-1 User Manual (en)

Setting the Printing Service (DPOF)
5. Press the       button.
The DPOF settings for all the images are saved and the camera returns to playback status.
ƃ The number of copies specified in settings for all images applies to all the images. 
Before printing, check that the number is correct.
ƃ Settings for single images are canceled when settings are made for all images.