What does resolution dpi mean?

Resolution, also known as resolution and resolution, is used to determine the fineness of bitmap image details. And dpi (Dots Per Inch) is its unit of measurement, which means the number of dots per inch.

#The resolution determines the fineness of the details of the bitmap image. Typically, the higher the resolution of an image, the more pixels it contains, the clearer the image, and the better the quality of the print. At the same time, it will also increase the storage space occupied by the files.

Resolution can be classified from two directions: display resolution and image resolution.

1. Display resolution (screen resolution)

Display resolution is the precision of the screen image, which refers to the number of pixels that the monitor can display. Since the points, lines and surfaces on the screen are all composed of pixels, the more pixels the monitor can display, the more detailed the picture will be, and the more information can be displayed in the same screen area, so resolution is a very important performance One of the indicators.

We can imagine the entire image as a large chessboard, and the resolution is represented by the number of intersections of all longitudes and latitudes. When the display resolution is constant, the smaller the display screen, the clearer the image. On the contrary, when the display screen size is fixed, the higher the display resolution, the clearer the image.

2. Image resolution

Image resolution is the number of pixels contained in a unit inch, and its definition is closer to the definition of resolution itself.

Units of resolution

The units describing resolution are: dpi (dots per inch), lpi (line per inch) and ppi (pixels per inch) inch). But only lpi is a scale that describes optical resolution. Although dpi and ppi are also units within the resolution category, their meanings are different from lpi. Moreover, lpi and dpi cannot be converted and can only be estimated based on experience.

Note: ppi and dpi are often used interchangeably. But there are also differences in the fields they use. From a technical point of view, "pixels" only exist in the field of computer display, while "dots" only appear in the field of printing or printing.

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