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To combine these two images with the Composite transformation tool will require making a mask to separate sky from land. Since the tree line is very complex, the paint tool with “Apply to Similar Pixels (Track)” is the best approach. You could paint either the sky or the tree line – the tree line was chosen here.
Next you need to fill in the rest of the frame using either a large paintbrush (with “Apply to All Pixels” set) or the Freehand Outline tool. This has been done as shown below. The resulting mask should be saved since you may need it for several operations.
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