TAILIEUCHUNG - Photoshop cs5 by steve Johnson part 32

Sử dụng đường cong và điều chỉnh màu Việc điều chỉnh Curves cho phép bạn điều chỉnh phạm vi tông màu trong hình ảnh mà không thay đổi hình ảnh tiếp xúc. Curves là một phương pháp điều chỉnh tuyệt vời cho các sáng bóng tối của một hình ảnh để đưa ra chi tiết, hoặc để tạo hiệu ứng đặc biệt như solarization. | Using Curves and Color Adjustments The Curves adjustment lets you adjust tonal ranges in the image without changing image exposure. Curves is an excellent adjustment method for lightening the dark shadows of an image to bring out detail or for creating special effects like solarization. To make it easy to use Photoshop provides presets to use and save. The Color Balance adjustment lets you change the highlight shadows and midtones of an image separately. The Color Balance dialog box performs linear adjustments to color therefore it s a good tool for correcting common tonal problems such as those caused by using film balanced for daylight indoors and getting a green cast to the image. The Brightness Contrast adjustment changes an image by an overall lightening or darkening of the image pixels. While good for special effects its linear way of changing an image s brightness and contrast do not lend themselves well to photo restoration. Curves and Levels are much better for this type of work. Use the Curves Adjustment Open an image. Click the Image menu point to Adjustments and then click Curves. To select preset mix levels click the Preset list arrow and then select the preset you want. Click the Channel list arrow and then select the composite channel. Drag the Black and White sliders to adjust tonal values. Click on the diagonal line to add an edit point and then drag up or down to increase or decrease the tonal values of the active image. Use the Eyedropper tools to select tonal values directly in the active image window. Select the Preview check box to view changes to the image. Click the curve option to adjust the curve by adding points or click the pencil option to draw a curve. To save settings click the Preset Options button click Save Preset type a name and then click Save. 0 Click OK. Select additional options to show different looks. 11 200 Chapter 8 Use the Color Balance Adjustment Open an image. Click the Image menu point to Adjustments and then click .

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