Histograms are a very useful tool that can be found in Photoshop and other various editing applications. The Histogram is the opened, gray section located on the right of the screenshot. You can find the histogram under the Image section on the upper tab of the overall screen. It’s labeled as “Levels” under the Image section.
This tool allows you to change the exposure and lighting of the inserted photograph. Using this tool, you can change the different levels of lighting by using the arrows placed underneath the graph-like, black section. This way, your photo won’t be overexposed or underexposed. With the Histogram tool, your photo will have the perfect exposure.