02-13-2022, 05:27 PM
For the size: https://www.gimp-forum.net/Thread-Image-size-in-Gimp
For the negative, you start with a "negative curve" (top left to bottom right) in Curves. A slight S shape increase contrast:
For the negative, you start with a "negative curve" (top left to bottom right) in Curves. A slight S shape increase contrast: