TAILIEUCHUNG - Photoshop CS4 Studio Techniques- P13

Photoshop CS4 Studio Techniques- P13: Staring at a shelf full of Photoshop books at the local bookstore, it seems that there are more special-effect “cookbooks” and technical tomes than anyone would ever care to read. The problem is that none of those “cookbooks” provide enough detail to really let you feel like you understand the program | Chapter9 Enhancements and Masking NOTES If you used the Blending sliders to hide the background be sure to convert the result into a permanent deletion before attempting to convert it into a layer mask. Figure The example image a crunchy bag of potato chips. 2007 PhotoSpin . Unlike the Background Eraser which truly deletes the background of the image the Blending sliders temporarily hide areas. You can move the sliders to their default locations to reveal the areas that were being hidden by the sliders. To delete the hidden areas Command Ctrl-click the New Layer icon at the bottom of the Layers panel to create a new layer below the one that has the sliders applied. Click the layer above the one you just created making the slider-applied layer active. Finally choose Layer Merge Down and the slider-applied layer will be combined with the empty layer. Because the underlying layer didn t have the sliders applied Photoshop will be forced to retain the look of the slider-applied layer without actually using the sliders. Channels In older versions of Photoshop you used channels to isolate complex images from their backgrounds. These days you ll mainly use channels with simpler images especially when working with an illustration instead of a photographic image. Often you can convert images into spot colors so that each color in the image prints with a different color of ink instead of printing with standard CMYK inks . Channels are the subject of one of the bonus videos on the book s website photoshop but for the moment let s look at how to use the Channels panel to isolate each color within an image. This might seem cumbersome at first but read on and you ll see the value of this approach. Let s say you have a logo or graphic that you d like to reproduce on a commercial printing press using red blue and yellow ink. You should look at the original and decide which areas will use each ink and if any areas need a combination of more .

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