Information about Scanning Resolution

Article ID: ART137544 | Date published: 05/13/2015 | Date last updated: 08/15/2015


The data in the image you have scanned is a collection of dots carrying information about brightness and color. The density of these dots is called "resolution", and resolution will determine the amount of detail your image contains. The unit of resolution is dots per inch (dpi). Dpi is the number of dots per inch (2.5 cm).

The higher the resolution (value), the more detail in your image; the lower the resolution (value), the less detail.

How to Set the Resolution

You can set the resolution in the following screens.

  • IJ Scan Utility

    Resolution on the (Scanning from a computer) tab of the Settings (Photo Scan, Document Scan, Custom Scan or Scan and Stitch) dialog  box

  • ScanGear (Scanner Driver)

    Output Resolution in Output Settings on the Advanced Mode tab

Appropriate Resolution Settings

Set the resolution according to the use of the scanned image.

Item TypeUseColor ModeAppropriate Resolution
Color photoCopying
Color300 dpi
Creating a postcardColor300 dpi
Saving to a computerColor300 dpi
Using on a website or attaching to e-mailColor150 dpi
Black and white photoSaving to a computerGrayscale300 dpi
Using on a website or attaching to e-mailGrayscale150 dpi
Text document (document or magazine)CopyingColor, Grayscale, or Black and White300 dpi
Attaching to e-mailColor, Grayscale, or Black and White150 dpi
Scanning text using OCRColor or Grayscale300 dpi


  • If you double the resolution, the data size of the scanned image quadruples. If the file is too large, the processing speed will slow down significantly, and you will experience inconvenience such as lack of memory. Set the minimum required resolution according to the use of the image.


  • When you will be printing the scanned image by enlarging it, scan by setting a higher resolution than the recommended one above.

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