This selects the group of images to use for print output.
The file with the focus.
The files selected in the main window.
All files listed in the main window.
Select one image per page, or a Proof sheet that will print multiple images per page.
When print one image per page, the size of the image in relation to the available print area.
When printing a Proof sheet, the size of each image in Units (see Paper tab).