SPI or samples per inch
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Definition:
Scanner and digital image resolution is properly called SPI or samples per inch. To scan an image the scanner takes a sampling of portions of the image. The more samples it takes per inch, the closer the scan is to the original image. The higher the resolution, the higher the SPI. DPI and PPI are often used instead although they are actually different measures of resolution.
Related Resources:
Resolution: SPI
The true measure of image resolution, what it is, how it is used, and how it relates to PPI, DPI, and LPI.
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