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The first step was to straighten up the images and correct any barrel distortion caused by the camera lens / photographer. This was achieved through the use of the lens correction filter(filter>distort>lens correction) . The images were corrected by using the straightening tool, then altering the values of the 'remove distortion', 'horizontal perspective' and 'vertical perspective' sliders. These changes were then applied and guidelines placed over the features to help line up the two images. The transform tool was used to make any adjustments required.
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