That is, the numerical values of physical quantities are represented by colors. Generally, the colors of cloud images are assigned according to rainbow colors, with warm colors representing larger values and cool colors representing smaller values. Of course, users can also customize these colors.

Usually, there is a table accompanying the cloud picture, indicating the numerical range represented by each color, which can be automatically determined by the computer or customized by advanced users. Just look at the photos on the table.

The reading of cloud pictures is quite simple, and you don't need to read the introduction. Moreover, many textbooks of numerical analysis software default that readers can read cloud images and will not be introduced in redundant articles.