Using Levels

I selected an image I wanted to adjust the levels on.
I used the magnet lasso tool to select the sky.
I then adjusted the levels so the sky was more blue.

A histogram is a graph that allows you to judge the brightness of an image. A correctly exposed photograph, the histogram will be mostly central.

This is an example of the histogram of a correctly exposed image.





This is an image that I have adjust the levels on. A high key image is where most of the pixels are white.













A high key image is where most of the pixels are white.
A low key image is where most of the pixels are black.