För tryck rekommenderar man oftast 300 dpi, enligt formeln önskad upplösning (ppi) ska vara 2xlpi (rastertäthet) och färgerna i bilden separerade till CMYK; Laserskrivare brukar ha en upplösningstäthet på 600 dpi, tidigare 300 dpi, och 1200 dpi blir mer och mer vanligt. Typografer brukar använda en upplösningstäthet på 1200 dpi. Learn the differences between 150, 300, 600, and 1200 DPI settings for printers, scanners, and computer mice. DPI is a measurement of how many dots per inch are used to create images and control movements on a screen or a device. If I want an image that is 20×30 inches, and I want / need the resolution to be 300 ppi, then the basic math tells us that we’d need 20×300 = 6000 pixels along the one side to have an image that size. Basic math and basic geometry with the aspect ratio. In this instance, the ppi value makes sense … a certain ppi at a required size (in dots per inch (dpi): 1) In computers, dots per inch (dpi) is a measure of the sharpness (that is, the density of illuminated points) on a display screen . The dot pitch determines the absolute limit of the possible dots per inch. However, the displayed resolution of pixel s (picture elements) that is set up for the display is usually not as Below is a theoretical overview on how to calculate the file sizes. 1. Calculating the file size of a scanned image (uncompressed) Uncompressed file size = Resolution in dpi (horizontal ) x Resolution (vertical) x Height (inches) x width (inches) x color depth. Example 1 - scanning an A4 page in 200 dpi in B&W. = 200 x 200 x 8.27 x 11.69 x 1. Usually the best dpi for scanning documents – balancing readability and file size – is 300 dpi. It makes the document easy to read and share. Also, font size can affect the dpi you choose. Standard font sizes, 10-point and up, are fine at 300 dpi. However, smaller fonts might be harder to read at this resolution, so you might decide to bump XiGP4.

300 dpi vs 600 dpi