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Photoshop CS4 for Dummies phần 10

và ẩn thông qua các tùy chọn từ trình đơn. Window). Bạn thậm chí có thể tạo ra một đường đi từ vùng lựa chọn bằng cách sử dụng bảng điều khiển đường dẫn. Nếu không có bảng điều khiển đường dẫn, đường dẫn của bạn không có ý nghĩa, trong tương lai và có thể sẽ không nhận được vào một | Chapter 17 Introducing Photoshop CS4 Extended 363 Source panel and select the Show Overlay option. The source frame appears as an overlay on the destination frame see Figure 17-7 . Figure 17-7 Show Overlay is very handy when cloning from frame to frame. lit If the Layer t Video Layers menu is grayed out open the Animation panel s menu and select Convert to Timeline or click the button in the lower-right corner of the Animation panel to toggle from the panel s Frame Animation mode. Keep in mind however that converting the panel also converts any active video clips. Converting a video clip to frame-based animation uses only the keyframes not all frames. If you want to generate a frame-based animation using all frames choose File1 thnport1 tVideo Frames to Layers see Figure 17-8 . Import Video To Layers Make Frame Animation Range To Import Q From Beginning To End @ Selected Range Only Hold down the Shift key while moving the slider or clicking the arrows Limit To Every 2 Frames Figure 17-8 You can import video as a frame-based animation. 364 Part IV Power Photoshop_ Measuring Counting and Analyzing Pixels Designed for researchers and scientists the measuring capabilities in Photoshop CS4 Extended are quite powerful. You can measure just about anything and count the number of whatevers in a technical image perhaps from a microscope or telescope. Measuring length area and more If you know the exact size of any element in an image you can then discover just about anything you want to know about anything else in that image. The key is to set the measurement scale as shown in Figure 17-9. Figure 17-9 Drag a known distance set the measurement scale. In this example we know the knee is 2.5 inches wide and we can see in the Options bar that the Ruler tool nested in the Toolbox with the Eyedropper was Shift dragged over 138 pixels. We can therefore set the scale to 138 pixels 2.5 inches. Now using any selection tool or the Ruler .