The Histogram palette is used to visually evaluate an image in a scientific way. You can do this in two ways, by looking at the graph or the statistical data. The graph represents the number of pixels contained in your image and their intensity at any one of the levels. The levels are plotted along the horizontal axis and the number of pixels at any given level on the vertical axis (Figure 3-15).

Statistical data is also provided to help you assess the image. Additionally, you can view histograms for individual channels, including alpha and spot channels, view luminosity values, or see how the color is distributed throughout your image. Furthermore, adjustments made to the image are monitored and the histogram updated dynamically.

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