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Chapter 4. Tools for Adjusting Tones > Working with Gray Maps and Histograms

Working with Gray Maps and Histograms

Photoshop offers several graphically based tools that let you visualize the current distribution of gray tones in your image and adjust that distribution to suit the photo. One of these is the histogram, which you might think of as a bar chart that displays the distribution of particular gray tones in another way. A typical histogram is shown in Figure 4.5. Along the bottom of the chart is a grayscale, which represents the gray spectrum from black to white. Arranged along this continuum are vertical bars, each of which depicts the number of pixels found in your image at a given gray level. A glance at the histogram can show you whether the gray values are bunched at one end of the spectrum, evenly distributed, or arranged in groups. Photoshop uses the Levels command to put this kind of histogram information to work.

Figure 4.5. The height of the bars on the histogram represents the number of pixels at that particular level



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