DPI (including mouse) ppi cpi meaning

Pixel per inch is the unit used by the image resolution. It indicates the number of pixels expressed per inch in the image. From the perspective of an output device (such as a printer), the higher the resolution of the image, the more detailed and precise the printed image.
DPI (DOT per inch) is the unit used for printing resolution, meaning the number of print points expressed per inch.

Printer resolution (DPI)

The resolution of a printer is the dot per inch printing precision (DPI) that the printer can print per inch. This is an important criterion for measuring the quality of printing, it is also a basic indicator for determining the resolution of a printer. Generally, the resolution of printers used by domestic and small office users should be at least between 300dpi--720dpi, but the larger the DPI indicator, the better.

The Print size of the printer is closely related to the image resolution. As long as the image resolution changes, the print size will change. In other words, the printed size cannot objectively describe the image size. The best way to describe the image size is to use the "width x height" pixel value of the image, for example, 360x720 pixels. The final result of multiplication is the number of pixels of the image. The relationship between print size, image size, and resolution can be expressed using the following formula: image size = image resolution × print size, image Size/Resolution = printed size. For a specific image, the image size is fixed. Therefore, the resolution is inversely proportional to the print size.

Digital Camera Resolution (PPI)

The resolution of a digital camera usually refers to the acquisition of pixel values for an effective image by a photosensitive device (usually CCD, a charge-coupled device). As long as there is enough pixel value, with the help of image resolution adjustment, we can get a product with good imaging quality. Therefore, the resolution of digital cameras is usually represented by the number of pixels. Similarly, the resolution of a digital camera cannot guarantee the quality of the image. For the current 3 million pixel-level digital camera, size, resolution, lens quality, and focus of CCD between different brands ...... Therefore, even if they are all 3 million pixel digital cameras, the image is different. On the whole, the current design of the camera has superior performance, good image resolution, and good imaging effect. The remaining quality often depends on the technical problems of users. Similar to scanners, a digital camera also has a so-called "Software Interpolation resolution". Therefore, to distinguish the real resolution of a digital camera, you must first look at the resolution of the CCD, let's take a look at the resolution of the finished camera. If the resolution of CCD is different from that of the camera, it must be achieved through software interpolation. In addition, for a digital camera, the resolution capability of its optical lens must be better than that of the photosensitive CCD, and the acquisition of the pixel value of the CCD must be greater than the final effective image resolution.

Mouse (dpi cpi)

For the photoelectric mouse resolution, some use the DPIUnitAnd some are represented by "CPI. Specifically, both referencesPrintingThe dedicated unit "Pi" (number of points that can be printed per inch ). DPI (dots per inch), that is, "pixels per inch", indicates the number of Coordinates received by its optical sensor per 1 inch (about 2.54 cm) movement on the physical surface. For example, our common resolution is 800 DPI mouse, which means moving the Mouse 1 inch. Its optical sensor can receive 800 different coordinate points, this means that the mouse pointer can move 800 pixels on the screen. It should be pointed out that this unit is not a proprietary unit of the photoelectric mouse resolution, but a "borrowed" unit. The unit used to indicate the resolution of the Optical Mouse is "CPI (count per inch)", that is, "measurement times Per Inch", which was proposed by the famous photoelectric mouse engine manufacturer anjet. The resolution is actually dynamic.Process, Using "count" (measurement) is more vivid than "dots" (pixels.