Script-Fu -> Light-Only invert
This is a non-adjustable script:
turns the photo into a photo negative without changing the colors
The Light-Only invert is part of the "color-invert" script, which has a total of five functions:
- invert - color only
- invert - light invert
- invert - simple color invert
- invert - solarizer simple
- invert - vivid v-invert