TAILIEUCHUNG - Photoshop cs5 cho nhiếp ảnh gia part 39

Điều chỉnh tông màu với độ điều chỉnh mức cung cấp tốt hơn kiểm soát cơ bản điều chỉnh âm cho hình ảnh của bạn, với khả năng điều chỉnh độ tương phản của độc lập kiểm soát vùng tối và sáng trong hình ảnh của bạn, cũng như để điều chỉnh độ sáng tổng thể. trong ACR bạn có thể có những điều chỉnh tương tự bằng cách thiết lập phơi sáng, người da đen, và độ sáng thanh trượt | Tonal Adjustments with Levels The Levels adjustment provides good basic control over tonal adjustments for your images with the capability to adjust contrast by independently controlling shadows and highlights within your image as well as to adjust the overall brightness. In ACR you can make similar adjustments by setting the Exposure Blacks and Brightness sliders. However there are still times you may choose to use Levels within Photoshop particularly if you want to make changes to only one area of your image. We ll talk about making localized adjustments later in the chapter but first we ll cover how to use Levels to make a global adjustment. We recommend using Levels to adjust contrast and brightness rather than the adjustment called Brightness and Contrast because the Levels adjustment offers far more accurate control of your settings. In addition you may opt to use Curves to increase the contrast in a particular range of tonalities rather than throughout the entire tonal range. We ll talk about Curves later in this chapter. The primary component of the Levels dialog box is a histogram display shown earlier in Figure that charts the distribution of tonal values within your image. Those values are represented from black at the extreme left to white at the extreme right. This gradation of tonal values appears as a gradient bar along the bottom of the histogram chart. The shape of the histogram chart tells you about the distribution of tonal values within the image. For example histogram data that is shifted toward the left indicates that the image is generally dark. However that doesn t necessarily tell you anything about the quality of the image it may simply be a dark scene. Similarly a brighter image has a histogram shifted toward the right. The key things to watch out for on the Levels histogram are clipping and gapping. Clipping is an indication that information has been lost in the highlights or shadows of your image. Gapping is represented by gaps in .

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