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Tài liệu Photoshop cs5 by Dayley part 51

Sử dụng Panel kênh Bảng kênh thể hiện trong hình 11,8 cung cấp quyền truy cập vào tất cả các kênh chứa trong hình ảnh. Để mở bảng Channels, chọn Window ➪ kênh từ trình đơn chính hoặc sử dụng phím tắt F7 và chọn tab Channels. | Chapter 11 Channels On the Web Site The image shown in Figure 11.5 can be found on this book s Web site as Figure 11-5.jpg. You can open it in Photoshop and use the steps in this section to see the effects of mixing the channels to create a better grayscale image. Using the Channels Panel The Channels panel shown in Figure 11.8 provides access to all the channels contained in the images. To open the Channels panel select Window C Channels from the main menu or use the F7 shortcut key and select the Channels tab. Note When working with RGB and CYMK images the top entry in the Channels panel is a composite channel of the RGB or CYMK channels. When you select the composite channel all the component channels are selected. Using the Channels panel you can view and select individual channels remove channels and create new channels. The following sections discuss using the Channels panel to work with the color channels in an image. FIGURE 11.8 The Channels panel allows you to manage individual color channels in images. Channels panel menu 349 Part III Selections Layers and Channels Selecting channels A useful feature of the Channels panel is the ability to select one or more of the channels individually. When only one channel is selected changes that you make by drawing erasing and applying filters are made to that channel only. This allows you to create special effects on specific channels or fine-tune adjustments to a single channel. You can select channels in the Channels panel by clicking them with the mouse or by pressing the Ctrl S key sequence listed next to the channel name. When you select the composite channel RGB or CYMK the image display shows the results of all three channels. When you select an individual channel the image display shows a grayscale rendition of the levels of the selected channel. To select multiple Channels use the Ctrl S or Shift keys. When multiple channels are selected. the image display shows the results of the combined channels. You .