(Yesterday, 09:25 PM)johnnywyoming Wrote: I do not have any samples of my own. I could link you to a Youtube video but basically it is blending the sky and ocean where they meet at the horizon; so the horizon disappears.
It is going to very much depend on the image. You could try the gimp_gmic_qt plugin, the blend seamless filter. http://www.gmic.eu
Not a wonderful result, but reasonably quick for a largish image.
(1) Select the sky above the horizon. Copy and then paste puts as a new layer in Gimp 3. Kill the selection, Selct -> None.
(2) Use the move tool to "nudge" that layer to cover the horizon.
(3) The gmic plugin and blend
(4) The result, not great, I could probably get a better result if I tweaked the overlap layer a bit to give a better fit with the background.