ApexWorld.com
About ApexWorld.com
The histogram in the center of the Levels dialog box shows how pixels are distributed in an image by graphing the number of pixels at each intensity level. It displays the relative number of pixels in the shadows (left part of the histogram), midtones (middle), and highlights (right). You can see that this image is not using the entire tonal range. Pixels don’t extend across the entire length of the histogram.
