In the previous section, we considered a very specific application of image overlaying. Now, we show you techniques for more general use.
Begin with the photograph shown in Figure 5-36. We want to replace the seascape, seen through the window, with Figure 5-37. To do this, you need to make the seascape transparent. You could try selecting it with the Select by Color tool or the Fuzzy Select tool, but this time try a brand new method instead.
Figure 5-37. A new background
Figure 5-38. The Apply Threshold dialog