Best web site - CHAPTER 10 ADVANCED COMPOSITING 411 a panorama
CHAPTER 10 ADVANCED COMPOSITING 411 a panorama is more difficult than it sounds, and you can save yourself a lot of work by shooting them level to begin with. It s less important that you keep the horizon at the same height for each photo. You can have more sky in one shot, more ground in another, and the panorama will still look fine. The downside: to get a rectangular picture you may have to trim more from the top and bottom than is ideal. Match Exposure Levels If you can shoot all the images at the same exposure setting, that may save a little work later. Otherwise, the individual photos may vary in color or brightness. Notice the different colors of the sky and the ground between the left and middle pictures of Figure 10-36. Some cameras offer a panorama setting which does this automatically, or manual exposure controls. If yours doesn t, you may be able to simulate it by metering on a point somewhere around the middle of your panorama: hold the shutter button halfway down, rotate the camera (still holding the button halfway), and press the button the rest of the way to take the picture. Repeat as necessary. This isn t crucial. You can adjust brightness in the GIMP, of course. And a panorama whose components have slightly different brightness levels may still look okay. Try it both ways and see whether it s worthwhile for you. Once you ve shot all your images and uploaded them to GIMP, it s time to start stitching. Decide on a Resolution Although it s normally best to work at the full resolution of your camera and scale the final image down after you re finished, that s not necessarily true for a panorama. Panoramic images combine a lot of photos into one humongous GIMP image. Using three-megapixel or larger images for a big panorama (say, five or more images) can take up so much memory that it slows the machine to a crawl. You might use full resolution if you need an image that large (for instance, if you plan on printing to a banner three-feet long). But otherwise, if you notice slowness, consider scaling down a bit. Once you know the resolution of the individual images, how many of them there are, and the overlap you used, you can calculate how big an image you ll need to hold the panorama. Calculate Your Expected New Image Size The next step in building a panorama is to make a new image of the right size. What is the right size? That s something you ll have to figure out. The easy way out is to simply take the width of your images and multiply by the total number you ll stitch together. There s not much penalty for starting with a new image that s too big you ll just crop it in the end anyway. (GIMP may complain if you try to create a new image larger than the parameters set in your preferences. The default, which you probably didn t change, is 64MB. Should you need to change this setting, you ll find it in Preferences under Environment.) If you re feeling lucky, subtract whatever you think you can get away with, say 20 to 25%. Don t stress over it. If it s too big, crop it later. If it turns out you need more space, a simple Image . Canvas Size will fix it in a jiffy. Once you ve decided on a size, create the new image. I ll refer to this image as the panorama image.
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