The use principle of PS color level explain the later introductory tutorials in detail

Nothing to do, so write a small tutorial for everyone to learn. I am not too proficient, if there are any omissions, mistakes, you will be trouble to correct the master. I'll use simple words to describe it, and that won't involve too many jargon.

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Sample diagram:

1. Color level is what: color level is the histogram described by the whole picture of the light and shade information. As shown in figure

From left to right is from dark to bright pixel distribution, the black triangle represents the darkest place (pure), the white triangle represents the brightest place (white). The gray triangle represents the middle tune.

As you can see, my photo is dark, with fewer pixels and less light pixels, so it's gray, which means a lower contrast picture. By the same token, we can speculate on other forms, and we will not repeat them here.

2. Modify the color level is: Modify the color scale is actually to expand the dynamic range of photos (dynamic range refers to the camera can record the brightness range), viewing and correcting exposure, color, improve contrast and so on.

Excessive exposure will overflow brightness, as shown in figure:

Exposure to the dark part of the overflow: classification:

• PS Getting Started Tutorial
• PS Post-processing tutorial