Blending of two images

#1

This is to be the top image

 

 

#2

I want the sky from this image so it is #2 image in my window.

#3

Under Image on the menu bar I open Image arithmetic and after experimenting with the different blends I found in this case the one that created the effect I wanted was Darkest, with All channels and modifiers of Divisor 1 and Bias -1 with the Clip colour values checked.

#4

This made this image which is too dark over all.

#5. By using the Histogram Functions
#6. I am able to adjusting the gamma I get a more pleasing balance of dark and light.

#6

#7

This is my finished image.