What is ICO?

The so-called ico is actually an icon file format, which can store icon files of a single pattern, multiple sizes, and multiple color palettes, and an icon is actually a collection of multiple images in different formats, and also contains certain transparent areas. Icons have a standard set of size and attribute formats and are usually small in size. Each icon contains multiple images of the same display content, each with a different size and number of colors. An icon is a set of similar images, each in a different format, and in this sense an icon is three-dimensional. An icon has another characteristic: it contains a transparent area, in which the desktop background under the icon can be seen through. Structurally an icon is actually similar to a McDonald's Big Mac.

An icon is actually a collection of multiple images in different formats, and contains a certain amount of transparent area. Because of the diversity of computer operating systems and display devices, it is necessary for icons to be sized in multiple formats.

When an operating system displays an icon, it selects the image of the icon that best fits the current display environment and state according to certain criteria. If you are using the Windows 98 operating system, and the display environment is 800x600 resolution with 32-bit color depth, the image format you see on your desktop for each icon is 256-color 32x32 pixel size. If you are in the same display environment, Windows XP operating system, the image format of these icons is: true color (32-bit color depth), 32x32 pixel size.