Nikon D3100 - Manual (Page 178)

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Create copies that appear to have been taken with a fisheye
lens. Press
2 to increase the effect (this also increases the
amount that will be cropped out at the edges of the image), 4
to reduce it. Press J to copy the photograph, or press K to exit
to playback without creating a copy.
Create an outline copy of a photograph to use as a base for
painting. The effect can be previewed in the edit display. Press
J to copy the photograph.
Create copies that reduce the effects of perspective taken from
the base of a tall object. Use the multi selector to adjust
perspective (note that greater amounts of perspective control
result in more of the edges being cropped out). Press
J to copy
the photograph, or press K to exit to playback without creating
a copy.
Fisheye G button
➜ N retouch menu
Color Outline G button
➜ N retouch menu
Before After
Perspective Control G button
➜ N retouch menu
Before After