404 CHAPTER 10 (Best web hosting site) ADVANCED COMPOSITING Figure 10-32.
404 CHAPTER 10 ADVANCED COMPOSITING Figure 10-32. A pattern in Grain merge mode adds extra texture to an image. Stacking Images Have you ever marveled at a space shot, like the ones from the Hubble Space Telescope? Did you know that the raw images straight from the camera are hardly ever that good? Astrophotography is one area where image compositing is an essential tool. Professional observatories, NASA, and amateurs in their backyards all use a set of related techniques known collectively as stacking. The first image stacks were just that: photographic negatives or slides stacked directly on top of each other. When these stacks were viewed on a light table, or printed, the result was a photograph with much higher contrast. With stacking, details that weren t visible in any single original became easy to see. Of course, today, stacking is usually done by computer. Stacking multiple images of the same object is very similar to the self-compositing you ve already used earlier in this chapter. But compositing several different but similar images is better than self-compositing in many cases, as you ll see. Sometimes astronomers get carried away with stacking. The famous Hubble Deep Field photo captured more than 1,500 distant galaxies in a tiny patch of sky 1/30th the diameter of the full moon. The Deep Field project shot 342 images over 10 consecutive days, and used 276 of them in the end. Of course, the Hubble team uses much more complex stacking methods than simple layer modes. But many of the basic principles are the same.
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