Autodesk 62205-051408-9001 User Guide - Page 669

Histogram Controls ❚❘❘ Histogram Controls Use the Histogram controls to help you visualize how the individual pixel RGB values are distributed across the image. Input sliders Histogram The histogram is a visual representation of all the color values contained in the image as they are distributed over the range of pixel values (0-255). The color values depend on the bit depth (255 is the highest value for 8-bit). You can view histograms for the red, green, or blue channels, or you can view the histogram for the entire image (RGB). Note: If the vertical lines on the histogram are too small to be viewed, use the Zoom field to increase the size of the entire chart. Input Sliders The sliders directly below the histogram contain the Input Levels controls. Use these controls to set the range of color values in the image. The white slider on the right sets the maximum value for the range. The black slider on the left sets the minimum value for the range. The gray slider in the middle changes gamma in the same way as gamma is changed in the Basics controls. You can use the Input Levels controls to increase the contrast in the image. For example, if you set the minimum value to 50, pixels with color values less than 50 are remapped to 0 (black). Pixels with color values greater than 50 are remapped to the appropriate color. If you set the maximum value for the range to 150, pixels with color values greater than 150 are remapped to 255 (white). This brightens the image and increases the contrast in the shadow areas. You can also set the maximum and minimum limits for the color range by entering the values directly in Histogram Controls Tonal ranges Histogram and Input sliders 653