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Individual coloured droplets of ink are visible; this sample is about 150 DPI. Dots per inch (DPI, or dpi [1]) is a measure of spatial printing, video or image scanner dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch (2.54 cm).
The ideal pixel density (PPI) depends on the output format, output device, the intended use and artistic choice. For inkjet printers measured in DPI it is generally good practice to use half or less than the DPI to determine the PPI. For example, an image intended for a printer capable of 600 dpi could be created at 300 ppi.
I suspect it was at least partly a guideline intended for graphic designers who were most familiar with the concept of output resolution as a DPI measurement; a designer working for print may have followed the notion "300 DPI looks good on paper," and carried that into the digital realm, where "72 DPI looks good on the computer screen" (again ...
Computer and handheld screens Designation Usage W (px) H Aspect ratio Total pixels Storage Display Pixel 0.26K1 Microvision: 16: ×: 16 1∶1: 1∶1: 1∶1: 256
The time resolution used for movies is usually 24 to 48 frames per second (frames/s), whereas high-speed cameras may resolve 50 to 300 frames/s, or even more. The Heisenberg uncertainty principle describes the fundamental limit on the maximum spatial resolution of information about a particle's coordinates imposed by the measurement or ...
Higher-quality paper, such as that used in commercial magazines, has less dot gain, and can range up to 300 LPI with quality glossy (coated) paper. In order to effectively utilize the entire range of available LPI in a halftone system, an image selected for printing generally must have 1.5 to 2 times as many samples per inch (SPI). For instance ...
The original ScanJet has a 8.5-by-13-inch platen and is capable of scanning at a maximum resolution of 300 dpi in 4-bit grayscale (16 shades of gray). [ 9 ] [ 10 ] The original ScanJet has an internal raster image processor (RIP), controlled by software, capable of outputting the scan to the computer in raw 4-bit grayscale, in halftone dither ...
Additionally, Windows 7 reads the monitor DPI from the EDID and automatically sets the DPI value to match the monitor's physical pixel density, unless the effective resolution is less than 1024 x 768. In Windows 8, only the DPI scaling percentage is shown in the DPI changing dialog and the display of the raw DPI value has been removed. [9]