Fisheye; Color Outline; Perspective Control - Nikon D3100 User Manual

Fisheye

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.

Color Outline

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.

Perspective Control

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.
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Before
Before
G button ➜ N retouch menu
G button ➜ N retouch menu
After
G button ➜ N retouch menu
After