No arguments
Description:
Keep only selected images.
(equivalent to shortcut command k).
Examples of use:
• Example #1
$ gmic
image.jpg split x keep[0-50%:2] append x

Command:
image.jpg split x keep[0-50%:2] append x
• Example #2
$ gmic
image.jpg split x keep[^30%-70%] append x

Command:
image.jpg split x keep[^30%-70%] append x