Newbie - managed to fix colour balance before but seem to have forgotten how!

[spookie]

(01-20-2019, 09:15 PM)rich2005 Wrote: As I understand it, it is lack of red in underwater photos.

The attached script maybe as a starter. Unzip put in C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\scripts Adds a menu Script-Fu -> Enhance -> Diving Red Filter
Then a little adjust using the Colors -> Hue-Chroma Reduce the hue value to give a little blue.

Got me to this.

Thank you so much, rich2005! That's a huge help - by using that script and following your advice, then also reducing chroma and lightness a little it's looking loads better!  

Thanks again!