- 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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