Photoshop histogram picture of the compass handles the biased photo

How to deal with the color of the photo, from there, why start from here. I don't know what other people are based on, but I am based on the histogram, (I said the histogram is the picture of the compass is my own argument)

Let's introduce the histogram first, and then give a few examples

1. What is a histogram?

Histogram is a graphical parameter to show the accuracy of the image exposure means, which describes the image display range of images in the gray distribution curve. It can help to analyze the exposure level of the picture and some other information. The left side of the histogram shows the shadow information of the image, the middle of the histogram shows the middle tone information of the image, and the right side of the histogram displays the highlighted information of the image.

2. What is the meaning of the histogram information?

Average: Displays the average of the histogram tones.

Standard deviation: Displays the amplitude of the transformation of a hierarchical value, the smaller the value, the closer the hue distribution of all pixels to the average.

Intermediate value: Displays the middle value of the hierarchy value.

Pixels: Displays the total number of pixels.

Level (Hierarchy): Displays the tonal value at the current cursor.

Quantity: Displays the number of pixels corresponding to the current cursor level.

Percent: Displays the cumulative number of pixels below the current cursor or selection hue, expressed as a percentage of the total pixel of the entire image.

Cache level: Displays the settings for the image cache, which is related to the memory and image cache setting in the Presets dialog box.

3. What is the correct histogram distribution?

A better picture should have light and dark details, in the histogram is from left to right are distributed, while the two sides of the histogram will not have a pixel overflow. And the histogram of the vertical axis of the corresponding part of the image of the area, the higher the peak indicates that the number of pixels of the light and dark value more.

If the histogram display only on the left side, indicating that there is no bright part of the picture, the overall dark, there may be insufficient exposure.

If the histogram appears only on the right side, the picture lacks the dark detail and is likely to be overexposed.

If the entire histogram runs across the horizontal axis, there is no peak, and both ends of the darkness overflow. This picture is likely to be too high, which will result in irreversible light and dark detail loss for both the screen and the Poles.