one of the tricks I used is to copy / paste the Treeline into either a quick-mask or layer mask or alpha channel, with a few modifcations to the contrast / brightness, and the eraser, I was able to make this channel a selection - to cut out branch spcae out of the "watch" image - plus I set one of the layers to muliply, this made the edges less obvious. Agreed , there is a quicker way , but I wanted a new background , so I used a new image to fuse into the original.. High rez images made smaller also hide pixels you miss.