The Level Equalization effect preserves detail in shadow or highlight areas that can be lost when you adjust the brightness, contrast, and intensity of an image's tone. Defining the start and end points of the tonal range allows you to redistribute the pixel values throughout the entire tonal range. A histogram displays the distribution of pixels according to brightness.
You can also use the Level Equalization effect to create color gradations on posterized images; to lighten or darken any combination of shadows, midtones, or highlights; to compress brightness values to printable limits; and to adjust the gamma curve (midtones).
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