What does 300dpi mean?

300dpi refers to 300 pixel units in one inch. DPI refers to pixels per inch, which is the scanning accuracy. The current default unit is the unit for calculating the number of pixels in an area of ​​one inch; the lower the DPI, the lower the resolution of the scan.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

300dpi refers to 300 pixel units in one inch.

DPI (Dots Per Inch) is a unit of measurement for dot matrix digital images, which refers to the number of sampled, displayable or output dots per inch of length. The current default is the unit used to calculate the number of pixels in an area of ​​one inch.

DPI is a unit of measurement for the resolution of devices such as printers and mice. It is one of the main parameters to measure the printing accuracy of the printer. Generally speaking, the higher the DPI value, the higher the printing accuracy of the printer.

DPI refers to pixels per inch, which is the scanning accuracy. The lower the DPI, the lower the resolution of the scan. Due to the influence of network transmission speed, the pictures used on the web are all 72dpi. However, this parameter cannot be used for developing photos. It must be 300dpi or higher 350dpi. For example, if you want to develop a 4*6-inch photo, the scanning accuracy must be 300dpi, then the file size should be (4*300)*(6*300)=1200 pixels*1800 pixels.

Extended information:

DPI is originally a unit of measurement in printing, which means the number of dots that can be printed per inch (Dot Per Inch) ). However, with the rapid development of digital input and output devices, most people also express the resolution of digital images in DPI, but more rigorous people may notice that the dots (Dot) calculated during printing and the display pixels of the computer monitor ( Pixel) are not the same, so more professional people will use PPI (Pixel Per Inch) to express the resolution of digital images to distinguish the two.

We usually talk about the DPI of the printer resolution, which refers to the "theoretical number of ink dots" that can be printed per inch under the highest resolution mode of the printer.

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