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Channels

In the ancient days of Photoshop (that would be five or six years ago), you were almost forced to use channels to isolate complex images from their backgrounds. These days, I mainly use them with simpler images, especially when I'm working with an illustration instead of a photographic image. When that's the case, I often convert the image into spot colors so that each color in the image prints with a different color of ink (instead of printing with standard CMYK inks). We covered much of this back in the Channels palette, but in this chapter, because we're learning how to isolate objects, it's useful to look at channels from a different angle and see how to use the Channels palette to isolate each color within an image. This might seem cumbersome at first, but stick with me and I think you'll see the value of this approach. If you want to follow along with my example (Figure 13.61), grab the image called potato Chips.tif from the CD at the back of the book. You'll find it in Chapter 13 of the folder called Practice Images.

Figure 13.61. I'll be working with this image of a bag of potato chips. (© 2003 PhotoSpin, www.photospin.com)



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