Photo Fix Extend your sky with Content-Aware Scale
1 Apply Content-Aware Scale
Open your landscape and then grab the Crop Tool from the Toolbox. Run the crop over the entire image and then drag the top of the crop bounding box upwards to extend the canvas to accommodate a larger sky and hit Return. Now grab the Lasso Tool and make a rough selection of the sky, then go to Edit>Content-Aware Scale.
2 Stretch the sky and fill in the blanks
Pull the top middle handle of the bounding box upwards until it hits the top of the frame and hit Return to set it down. If you have an unobstructed horizon your job is done, but in this example the selection was a little awkward due to the hills on either side, which left us with gaps when we extended the sky up. Don’t worry though, as these can easily be fixed. Just grab the Spot Healing Brush Tool from the Toolbox and paint over the blank areas to fill them in.