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May 19, 2016 at 12:23 comment added Carl Witthoft If you go with essentially hand-coded image manipulation, then you need to bracket the range of RGB combination values (aka hue/sat range) which comprise the sky, and apply a weighted curve to those values. I'd view that as a fun home project :-) but not easy to do well.
May 17, 2016 at 0:56 history answered Aganju CC BY-SA 3.0