tailieunhanh - Tài liệu Photoshop cs5 by Dayley part 14

Sử dụng bảng biểu đồ Trong các phần trước, chúng tôi đã thảo luận về tầm quan trọng của việc sử dụng biểu đồ trong sự hiểu biết thành phần của ánh sáng và màu sắc trong hình ảnh. Photoshop cung cấp một bảng biểu đồ giúp bạn nhanh chóng xem các biểu đồ quan trọng của hình ảnh. | Part I Getting Started with Adobe Photoshop CS5 FIGURE The color levels histograms of an RGB image in Photoshop Using the Histogram panel In the previous sections we discussed the importance of using histograms in understanding the composition of light and color in an image. Photoshop provides a Histogram panel that helps you quickly view the important histograms of an image. Using the Histogram panel you can view the histograms of each of the channels all channels together colors and luminosity. You also can use the histogram tool to view histograms of specific layers. In addition to the histograms the Histogram panel can show you numerical statistics about the level composition of each histogram. Tip When you are making adjustments or corrections that have to do with color hue tone contrast and so on view the Histogram panel for the image. Look at the overall histogram to check for overexposure underexpo-sure. Also look at the individual channels to verify that the color balance is what you would expect for that image. The Histogram panel shown in Figure is launched by selecting Window C Histogram from the main menu in Photoshop. The following sections discuss how to configure and use the Histogram panel to view histograms and statistics. 102 Chapter 4 Understanding Colors Histograms Levels and Curves FIGURE The Histogram panel in Photoshop Setting Histogram panel options The Histogram panel provides several views that can be set by selecting the menu icon shown in Figure . The following settings in the Histogram panel menu allow you to configure what information is shown in the Histogram panel Compact view The compact view shown on the left in Figure shows only the histogram image of the current channel. This view is handy if you just want to dock the histogram with several other panels to view changes as you adjust the image. Expanded view The expanded view shown in the center in Figure shows the histogram image of the current channel but