Samsung SGH-ZX20ZKACIN - Manual (Page 114)

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up navigation key increases the image brightness.
down navigation key decreases the image brightness.
flips the image vertically.
flips the image horizontally.
enables and disables the flash.
switches to Camera.*
Note: *This shortcut is only available when accessing camera mode using the
key.
changes the image size.
changes the video quality.
changes the Recording mode.
changes the color tone of the photo.
mutes the audio during a recording.
takes you directly to the Video Album.*
Note : *This shortcut is only available when accessing camera mode using the
key.