The x-axis of the graph represents the tonal values of the original image the y-axis of the graph represents the adjusted tonal values. Individual pixel values are plotted along a tone curve that appears in a graph and represents the balance between shadows (bottom of graph), midtones (middle of graph), and highlights (top of graph). The Tone curve filter lets you perform color and tonal corrections by adjusting either individual color channels or the composite channel (all channels combined). The tonal range is displayed as a histogram. You can also shift the tonal range for a specific color channel. For example, if you want to increase the tonal range, you can sample a shadow area to set the target color to black, and then sample a highlighted area to set the target color to white. You can take samples from shadow, midtone, and highlight areas, and set target tonal values by choosing colors from a color model. The Sample/Target balance filter lets you shift the tonal range of an image by sampling specific image areas. The Histogram equalization filter lets you view the tonal range of an image and redistribute the balance of shadows, midtones, and highlights in the composite channel or in individual color channels according to a preset histogram model. The filter uses neighboring pixels to create a stylized effect. The Local equalization filter lets you enhance the contrast near image edges and reveals details in both light and dark regions. The histogram can also be adjusted by sampling values from the image. An interactive histogram lets you shift or compress brightness values to printable limits. The Contrast enhancement filter lets you adjust the tone, color, and contrast of an image while preserving shadow and highlight detail that is lost when you adjust the brightness, contrast, and intensity of an image. This adjustment is performed on each color channel of the image, resulting in changes to the color and tone of the image. The Auto adjust filter equalizes the shadows, midtones, and highlights in an image by automatically redistributing the significant pixel values throughout the tonal range. For more information about using lenses, see Working with lenses. Many of these filters are also preset lens types. However, most of these filters are advanced tools that give you greater control over the image correction process or let you change colors for specific effects. Some of these filters offer the same controls that can be found in the Image Adjustment Lab.
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