Its funny I did a video on using Gimp to make it. It has a slider and as I slide I seem to always like to go further and further...I am really bad at deciding and can fiddle with the different shades and things all too much lol. I think I like it darker in the video is what I meant to say lol.

If you want to look here is the link!
https://steemit.com/dtube/@old-guy-photos/hza5vuek