DPI

  • When we see printed image closely we observe dots because printer prints the image by using dots.
  • Resolution of the image based on this dots.
  • If there are more dots in less are then the image is more detailed and clear.
  • DPI means Dots Per Inch.
  • The printer resolution is based on DPI. If printer has more DPI then it has high resolution.
  • It prints clear and detailed images.
  • A normal inkjet printer sprays ink through tiny nozzles and typically capable of 300-700 DPI.
  • It means 300 X 300 = 90,000 Dots Per Inch.
  • A laser printer applies toner through a controlled electrostatic charge and maybe in the range of 600 to 2400 DPI.
  • In monitors we have PPI ( Pixels Per Inch).
  • The resolution is based on number of pixels in square inch.
  • A digitally stored image has no physical dimensions measured in inches or centimeters.
  • Some digital file formats record a DPI value or PPI value which is used when printing the image.
  • This number lets the software of printer to know the intended sizes of the image.
  • For vector images there is no equivalent PPI because it is resolution independent.
  • The conversion of PPI to DPI is done by the software.
  • Normally one dot is equal to one pixel.
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