fade_y
Arguments:
- 0<=_start<=100,0<=_end<=100
Description:
Create vertical fading from selected images.
Default values:
start=30 and end=70.
Example of use:
$ gmic
image.jpg testimage2d {w},{h} +fade_y 30,70

Command:
image.jpg testimage2d {w},{h} +fade_y 30,70

Command:
image.jpg testimage2d {w},{h} +fade_y 30,70

Command:
image.jpg testimage2d {w},{h} +fade_y 30,70