I am practicing masking in different software programs. Of late, I have picked up a trial version of Topaz’s Remask 4. It does a very good job, far better than less expensive programs, and with very good edge refinement. This is one of my first attempts using it, replacing a dull sky with one filled with clouds. Processed using LR5, CS6, and Remask 4. If you would like to see what Remask 4 can do, google it or look for it on YouTube, but you can also see how it worked with a photostacked rose.