Photoshop CS4 Studio Techniques- P12

Photoshop CS4 Studio Techniques- P12: Staring at a shelf full of Photoshop books at the localbookstore, it seems that there are more special-effect“cookbooks” and technical tomes than anyone would evercare to read. The problem is that none of those “cookbooks”provide enough detail to really let you feel like youunderstand the program
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Photoshop CS4 Studio Techniques- P12Chapter 9 Enhancements and Masking Figure 9.19 Top text layer set to Figure 9.20 Top text layer set to Normal mode. Multiply mode. This is a simple way to make text or graphics “overprint” on the underlying image instead of covering it up (Fig- ures 9.19 and 9.20). You can also use it anytime you have scanned text or other graphics that you’d like to print on something else. The main problem is areas that are not completely white. Any area that is darker than white will darken the under- lying image, so you’ll occasionally need to choose Image > Figure 9.21 This tattoo will be trans- Adjustments > Levels and move the upper-right slider planted to another image. (©Stockbyte, www.stockbyte.com.) to make sure that the background is pure white. As an example, let’s take the tattoo from Figure 9.21 and put it on Figure 9.22. We place the tattoo on a layer above the second image, setting the blending mode of that layer to Multiply (Figure 9.23), choose Image > Adjustments > Desaturate, and then adjust the image using Levels until If some areas don’t disappear, eradicate them with the Eraser tool. only the tattoo appears and the background surrounding it disappears (Figure 9.24). Figure 9.22 Image to which the Figure 9.23 Result of setting the Figure 9.24 Result of desaturating tattoo will be applied. (©Stockbyte, tattoo layer to Multiply mode. and then adjusting the image with www.stockbyte.com.) Levels.316 IV: Creative TechniquesEarlier chapters talked about how both your screen andprinter simulate a wide range of colors using only red,green, and blue light; or cyan, magenta, and yellow ink.To demonstrate this, we could create an image containingthree circles, one per layer: cyan, magenta, and yellow.But they don’t act like ink when they overlap (Figure 9.25).So we simply set the blending mode for each layer toMultiply, and then everything works the way it should(Figure 9.26).Now let’s use Multiply to create a contour drawing out of Figure 9.25 In Normal mode, the threea photograph (Figure 9.27). Because we’re going to end circles don’t interact with each other.up with black lines and no color information, chooseImage > Mode > Grayscale. To get contours, choose Filter >Stylize > Trace Contour, and move the slider around a bit(Figure 9.28). Trace Contour puts a black line around theedge of a particular shade of gray. But there are two prob-lems: The contours aren’t usually smooth, and there’s onlyone contour for the entire image. To fix the first problem,smooth out the image by applying the Gaussian Blur orthe Median filter. The latter requires a little more effort,and that’s where we can start putting the Multiply blendingmode to work. Figure 9.26 Result of setting each layer to Multiply mode.Figure 9.27 A photograph converted to a contour drawing. (©2008 Dan Ablan.) Figure 9.28 The Trace Contour dialog. 317Chapter 9 Enhancements and Masking Duplicate the layer enough times so that you have one layer for each contour that you want. Then apply the Trace Contour filter to each layer, using a different level setting each time in the Trace Contour dialog. Each layer now If you want six contours, for ...