How to work with Histogram
To work with Histogram
Select the Choose Color tab from the Menu Bar and choose Histogram.
Use the Histogram Adjustment feature to adjust the contrast of your image by adjusting the histogram. This brings out details in the image without losing important information.
The histogram appears in the center. It displays the graph for the component selected in the Edit box. The horizontal axis represents values from 0 to 255. The vertical axis represents values from 0 to X.