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Tham khảo tài liệu 'professional information technology-programming book part 17', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | circumstances that are likely to be used in the same lighting conditions. For purposes of this example you should shoot indoors using tungsten bulbs. Make sure there is no outside daylight coming in and that the tungsten bulbs are all of the same type. Don t mix traditional-type tungsten with the energy-saving fluorescent that has become so popularthey are likely to have very different color temperatures. Set up your shot with a white background. Figure 4-24 shows how each of these should be set up. Figure 4-24. A diagram of how your first camera calibration shot should be set up. Here s how you use this setup to calibrate your camera for this lighting situation. If you use the color card in most of your other shooting at the beginning of any series you will be able to check against the color card to calibrate the settings for this situation. Use the camera s information as recorded to metadata to note the time of day year lens and camera. Looking at the picture itself will generally tell you about the conditions in which the photo was shot. So figure out how to incorporate all that information into a filename for the setting and save it. Of course it will help if you know how to save calibration settings so you can apply them to any other RAW file. If that RAW file was shot in the same conditions your rendition should be technically perfect especially to ensure the accuracy of colors. I ll go over saving calibration settings next. Here s how you shoot the test shot to calibrate colors accurately for controlled tungsten lighting on a white background 1. Set up your lights background and subject to suit the intent of the photo you re about to shoot. 2. Use one of those little business card easels or find some other way to prop up a color test card. It is best to have at least one 10 percent gray swatch and six 10 percent swatches of each primary and complementary color. 3. Shoot a test shot and take a look at the Histogram to make sure the exposure has enough detail
