600dpi means that one inch contains (printed out) 600 pixels. dpi is the number of pixels per inch of the image.
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.
DPI (Dots Per Inch, 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.
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