All (keyboard shortcut Ctrl-~) Show all
the image channels in the preview display.
1, 2, 3, and 4(keyboard shortcut Ctrl-1, 2 Ctrl-2,
etc.) Show only the specified channel in the preview
display. The channel name is displayed in the preview window
banner.
Zoom In (keyboard shortcut Ctrl-Alt +) Enlarge the image
by stepping up the magnification. The zoom factor percentage
is displayed in the preview window banner..
Zoom Out (keyboard shortcut Ctrl-Alt minus-key) Reduce
the image by stepping down the magnification. The zoom factor
percentage is displayed in the preview window banner..
Zoom to Fit Zoom the image to just fit
in the preview window.
Zoom 100% Zoom the image to actual size,
so that one image pixel corresponds to one display pixel. This
is 100 percent zoom.