display_rgba
Arguments:
Description:
Render selected RGBA images over a checkerboard or colored background.
(equivalent to shortcut command drgba).
Default values:
background_RGB_color=undefined (checkerboard).
Example of use:
$ gmic
image.jpg +norm threshold[-1] 40% blur[-1] 3 normalize[-1] 0,255 append c display_rgba

Command:
image.jpg +norm threshold[-1] 40% blur[-1] 3 normalize[-1] 0,255 append c display_rgba