This is another composite, this time with a church in Reykjavik and the aurora borealis. The lighting on the church was extremely contrasty, and in order to deal with the bright highlights and deep shadows in this night shot I had to use a 7-frame HDR sequence. Once that was composited using the procedure in Photoshop, I used the pen tool to precisely select the church. Then, to realistically blend the bare trees at the bottom of the frame with the new sky, I pasted the aurora shot over the church (Edit > paste), made a layer mask (Layer > layer mask > reveal all), and then used the gradient tool to make the blend by dragging the cursor from the bottom portion of the composite to the top. Finally, I recalled the church selection (Select > load selection) and used the brush tool to brush away the green of the aurora from the church. My exposure for the northern lights was 13 seconds, f/2.8, and 1250 ISO.
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