Instructions: Negative in GIMP create
- Open the photo in GIMP that you want to use a Negative to create.
- Now click on "Colors" then "Invert".
- Now the colors of your image are inverted and you can save the image via "File" > "Export to" again.

Invert-function in GIMP
Read also, how old Negative scan. After that, you can transform this practical tip the images into a Positive.
