Affordable web design - CHAPTER 2 IMPROVING DIGITAL PHOTOS Color Correction
CHAPTER 2 IMPROVING DIGITAL PHOTOS Color Correction Finally, at the top of the Levels dialog is a menu allowing you to choose a channel (Curves has one, too). Initially this is set to Value, which you can think of as meaning brightness ; but you can also choose Red, Green, Blue, or Alpha. The three color channels allow you to adjust color problems, such as a yellow cast from a photograph taken indoors without a flash. Color correction will be explored later, in the Correcting Color Balance section in Chapters 6 and throughout Chapter 8, but meanwhile, if you have an image that needs color correction, try using this menu in Layers or Curves. Alpha is a term meaning transparency ; you ll work more with transparency in Chapters 3 and 4. Curves The Curves dialog (Figure 2-19) adjusts many of the same values as Levels, but in a different way. Some people find it more intuitive than Levels; others less so. You ll probably find that you prefer one or the other; which one you use is purely a matter of preference. Figure 2-19. The Curves dialog In the Curves dialog, the horizontal bar at the bottom of the graph represents input values, just like the input graph in the Levels dialog. The vertical bar represents output levels. But you don t need to know that to use Curves. To begin using it, just click on the line and drag it up a little (to make the image brighter) or down a little (to make it darker).
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