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The Levels adjustment is in the form of something called a histogram. A histogram is a way of plotting the distribution of values within a dataset that is at least one hundred years old. Below is a histogram of the height distribution of fifty students:

Levels 01.png

Photoshop Levels histogram looks like this:

Levels 02.png

Heres how we read it. The Levels below is showing us the even distribution of values of a simple black to white gradient.

Levels 03.png

The Levels below is showing us the clumped distribution of the values of a simple dark gray to light gray gradient.

Levels 04.png

Here is a more realistic example. The histogram is showing us that the the brightest values in the image are only light grey.

Levels 05.png

As well as displaying data it Levels can also change the values.

Levels 06.png