Problem
I had a picture of a silhouetted tree with a light sunset background and needed to cut the detailed tree out in order to add a new background.

Solution
I mostly used the region editor and worked through colours to keep/delete as the tree was mostly made up of very dark tones. I also used high edge sensitivity and a fine texture filter to get the branches. After, I added a sunset sky from a previous photo of mine, and used PS CS2 filters (flaming pear) to add the water. This was my second attempt at using fluid mask and it really is a simple tool to use and incredibly powerful.