Graphic design and desktop publishing share so many similarities that people often use the terms interchangeably. Measurements Systems > Measuring Resolution > DPI: Printer Resolution However, even if you call it DPI, remember that each dot or "unit of measure" behaves differently depending on whether it is a scanner (or scanned image), a monitor (or on-screen image), or a printer (or printed image). DPI is frequently used in place of one or both terms. In practice, SPI and PPI are often used interchangeably.
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See Part 5: LPI for more on printing images.ĭPI and the Web: On the Web, DPI is irrelevant because images display on-screen in pixels (PPI). If you will be printing to a 300 DPI printer, resolution in excess of 300 SPI is rarely necessary.ĭPI and Printing: In general, the higher the resolution of your printer or imagesetter, the greater detail you can print and the better appearance of your output. Because monitor resolution is so much lower than printers, low resolution images that look fine on-screen often print poorly.ĭPI, Scanning, & Digital Images: DPI is only relevant in that the combination of your printer's DPI and the required LPI determine how much resolution your image must have. The lower the DPI of a printer, the less fine detail it can print and the fewer shades of gray it can simulate. Basically, 600 dpi printers print 600 tiny little dots across one inch and 600 dots vertically for one inch. Most printers print the same number of dots horizontally and vertically, though some may have differing numbers.
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It is the measure of how many dots of ink or toner a printer can place within an inch (or centimeter). It is not the resolution of images on screen. It is not the resolution of scanned images. For desktop publishing, it is probably the least important measure as well. DPI (dots per inch) is probably the most familiar and most misused measure of resolution.