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Level Việc điều chỉnh cơ bản nhất mà bạn có thể làm cho hình ảnh để thay đổi màu sắc và ánh sáng là để thay đổi các thành phần cấp độ của các kênh màu trong hình ảnh. Điều chỉnh mức độ có thể khôi phục thành phần chi tiết trong các khu vực của một hình ảnh và sửa chữa một loạt các vấn đề ánh sáng | Chapter 13 Lighting and Color Adjustments FIGURE 13.23 Using the Hue Saturation tool you made the red and yellow leaves pop out and changed the color and intensity of the sky and water to give the photo a brilliant color tone. Levels The most basic adjustment you can make to an image to change the color and lighting is to change the level composition of the color channels in the image. Adjusting the level composition can restore detail in areas of an image and fix a variety of lighting problems. Photoshop provides the Levels Adjustment tool to give you direct access to the levels of the color channels. You can access the Levels Adjustment tool by selecting Image C Adjustments C Levels from the main menu or by selecting a Levels adjustment in the Adjustments panel. This section discusses how to configure and use the auto levels adjustment as well as making custom levels adjustments to your images. Cross-Ref The concept of color channel levels was introduced in Chapter 4. You should read that chapter before reading this section because you need to understand the concepts from Chapter 4 to get the most out of using the Levels tool. 411 Part IV Enhancing Correcting and Retouching Using the Levels Adjustment tool The best way to use the Levels Adjustment tool is to add a Levels Adjustment layer to the image by selecting the Levels icon in the Adjustments panel. This loads the Levels Adjustment Layer tool shown in Figure 13.24. FIGURE 13.24 Using the Level Adjustment tool you can adjust the levels of color channels to change the color composition and bring detail back to images. White eyedropper Gray eyedropper Black eyedropper Presets Black slider White slider Midtone slider 412 Chapter 13 Lighting and Color Adjustments The Levels Adjustment tool allows you to make adjustments to the composite channel or any single color channel using the following controls Presets This allows you to select Photoshop s default preset or one of your own saved ones. You can save the .
