tailieunhanh - Tài liệu Photoshop cs5 by Dayley part 53

Khu vực được chọn: Khi được chọn, các khu vực được lựa chọn được đánh dấu bằng màu sắc lớp phủ đã chọn trong lĩnh vực màu. Sử dụng tùy chọn này khi bạn muốn xem các điểm ảnh thực tế của các dữ liệu đó là bị ảnh hưởng bởi các kênh alpha. Spot Color: Khi được chọn, các kênh alpha được chuyển thành một kênh màu sắc tại chỗ và lựa chọn Opacity là thay đổi thành một lựa chọn đoàn kết. màu Spot được thảo luận trong phần tiếp theo. | Part III Selections Layers and Channels Selected Areas When this is selected the selected areas are highlighted by the overlay color selected in the Color field. Use this option when you want to see the actual pixels of the data that is being affected by the alpha channel. Spot Color When this is selected the alpha channel is converted into a spot color channel and Opacity option is changed to a Solidity option. Spot colors are discussed in the next section. Color This specifies the color of the channel overlay. The overlay is displayed in the document window when the alpha channel visibility is on in the Channels panel. This allows you to view more easily the alpha channel selection because either the selection or the mask is overlaid with the specified color. When you click the color a color chooser window is displayed allowing you to specify the color. Opacity This specifies the opacity of the overlay channel. Turning up the opacity allows you to better see the pixels behind the overlay. You may need to play around with this setting to see enough of the background image to determine the exact selection. Solidity This specifies the Solidity of the spot color channel. Turning up the solidity adjusts how much tint of the spot color is applied to the image or other channels when merged with the spot color channel. FIGURE Setting the alpha channel options allows you to specify the color of the overlay and whether the selection or the mask is overlaid with color when the alpha channel is visible. Spot Color Channels Spot colors are used for offset printing. A spot color is simply a single color that is impressed on the paper in a single pass through the printer. Offset printing is the process of printing in multiple passes using one spot color per pass. You use spot colors when printing images for two main reasons. First it is much less expensive to use spot colors when printing than mixing the standard CYMK inks to create the colors needed. Second you may want