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Originally Posted by onelifecrisis
Someone help please - I've found out that the extra channel is definitely an alpha channel. To get the early/mid/late evening sky colours right I need to merge this channel with the RGB channels and output a standard RGB image as a result... but I don't know how to do this!
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You can't merge an alpha channel into a RGB image. Alpha channels are a transparency layer and only (in this instance) show when the conditions are right i.e when the day is in the process of changing into night. That is when the alpha comes into play.
The only thing you might be able to do is edit/change the alpha channel to something more to your liking.