TAILIEUCHUNG - Professional Information Technology-Programming Book part 19

Tham khảo tài liệu 'professional information technology-programming book part 19', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Using Camera Raw for Creating Effects Most of your adjustments in Camera Raw will be for changing brightness contrast and other overall characteristics such as noise sharpness and vignetting using a tool that is completely nondestructive. Most effects processing is terribly destructive which is why it is placed toward the end of the book and workflow Chapter 11 to be specific . However there are a few effects that you can at least begin in Camera Raw. After all the more nondestructive processing you can do for an image the better. . Making Multiple Exposures in Camera Raw Now that you know how to use and make adjustments in Camera Raw we ve come to one of the more creative benefits of using the programto use the RAW files larger range of brightness as multiple exposures. There are basically two reasons you might want to do this to create an especially interesting interpretation of the image by exporting the image as a particularly high-key or low-key interpretation see Figure 4-34 and the next two sections of this chapter Increasing Dynamic Range by Making Multiple RAW Renditions and Increasing Dynamic Range Using the HDR Command or to create exposures that can be combined to show detail in both the extreme highlights and shadows see the two sections on HDR techniques later in this chapter . Figure 4-34. Three different exposures of the same image all made approximately two f-stops apart in Camera Raw and opened in Photoshop. Of course as long as you haven t obviously under- or overexposed the image recorded by the camera the difference in exposure can be varied by as much as five f-stops in Camera Raw. . Increasing Dynamic Range by Making Multiple RA W Renditions One of the great limitations of digital images is that present day printing methods ultimately force us to reduce our image data to 8 bits because that s all the printer can handle. So the ultimate dynamic range is somewhat less than that of film and we often suffer clipped highlights and .

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