Web design service - CHAPTER 10 ADVANCED COMPOSITING 413 Figure 10-38.
CHAPTER 10 ADVANCED COMPOSITING 413 Figure 10-38. Draw a gradient on the layer mask so that the left edge of the second image fades into the first. Fine-Tune the Position of the Second Image Now that the second image has transparent areas, you can position it more accurately. Switch to the Move tool, but there s a trick: if you simply click and drag with the Move tool, you ll move the layer mask rather than the layer itself, since the mask is still selected in the Layers dialog (indicated by the white boundary around it in Figure 10-38). Click on the layer preview in the Layers dialog to select the layer and not just its mask. Zoom way in so that you can see details, and scroll so you can see the region of the image where the two layers overlap. Then use the Move tool to move the second image around until it matches the first image as well as possible. (Don t forget about the arrow keys.) It ll usually be obvious when the images mesh. When you have two overlapping images (one partially transparent) that don t quite match, the image will look a bit blurry, as though you had a few too many beers before beginning the stitching process. When you find the right position, suddenly the image will seem to snap to focus, and all the blurriness and double vision will go away. The catch? It won t happen everywhere in the image. Most of the time, the two images won t match up perfectly. If you line them up in the center, the top and bottom won t match. You re seeing lens warp. If you overlapped the images a lot (50% or more) or zoomed in when you shot the images, you ll see less lens warp, but there will always be some. Usually, you re best off matching two layers at the vertical midpoint, and not worrying about the top and bottom (you can fix that in the next step). But if your panorama has a pronounced horizontal line somewhere say, the horizon in an ocean shot you may want to use that as the location to match.
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