Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The figure indicates the histogram on the Photoshop. As the mean value approaches to 0, it indicates the picture was dark, whereas it indicates light when the mean value closes to 255. We assumed that medium value and proper exposure is 127.5.
