CHAPTER 10 ADVANCED COMPOSITING 407 Figure 10-33. (Web server hosting)
CHAPTER 10 ADVANCED COMPOSITING 407 Figure 10-33. A 24-layer stack of the same fence is much less noisy. You can even see some stars! Increasing Contrast by Multiplicative Stacking Those great shots that you see from NASA spacecraft aren t just snapshots downloaded straight from the camera. They take a lot of processing before NASA puts them up on public websites. (If you watch NASA TV, sometimes you can even see GIMP on screens at Mission Control! Of course, NASA uses a wide assortment of tools, not just GIMP.) Figure 10-34 shows an original photo of Saturn s largest moon Titan, taken from the Cassini spacecraft. (You can find unprocessed images by looking for raw images on the Cassini web- site.) You can see that there s a little detail there, but it s hard to see it well. The contrast is very low. But Cassini actually shot four of these Titan shots, and you can download all four and stack them. Register the frames, and then set each layer s mode to Multiply (Figure 10-35).
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