So an lpi of 150 and a quality factor of 2 will yield a final scanned image resolution of 150 lpi × 2 = 300 ppi ( Hinderliter, 2003). The guide uses printing lines per inch (lpi) and a quality factor to determine the final input resolution. For example, the SilverFast user guide uses dpi to refer to pixels per inch, so a 300 dpi scan will result in the creation of a digital image with 300 pixels per inch. Printing or viewing an image would involve output resolution.ĭocumentation for different scanner programs may use different terminologies to describe input resolutions. Capturing an image using a scanner or a digital camera would represent input resolution. An easy way to clarify the confusion is to make the distinction between input resolution and output resolution. When viewing a digital image from a computer, the quality of viewing is affected by the screen resolution. Although ppi and dpi are sometimes used interchangeably, dpi has a distinct meaning when used to measure a printer’s resolution. There is more than one kind of resolution and people tend to misuse terminology. Same image scanned at different resolutionįor many people, the term ‘resolution’ has been one of the most confusing areas of digital imaging.
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