This is due to the limited range of colours for each dot typically available on a printer. The DPI measurement of a printer often needs to be considerably higher than the pixels per inch (PPI) measurement of a video display in order to produce similar-quality output. A laser printer applies toner through a controlled electrostatic charge, and may be in the range of 600 to 2,400 DPI. An inkjet printer sprays ink through tiny nozzles, and is typically capable of 300–720 DPI.
A dot matrix printer, for example, applies ink via tiny rods striking an ink ribbon, and has a relatively low resolution, typically in the range of 60 to 90 DPI (420 to 280 μm). The range of DPI supported by a printer is most dependent on the print head technology it uses. A printer does not necessarily have a single DPI measurement it is dependent on print mode, which is usually influenced by driver settings. Up to a point, printers with higher DPI produce clearer and more detailed output. This is caused by the spreading of ink on the surface of the media. The HTML creates the boxes containing the instructions and the pixel-ratioīox that will display the current pixel ratio information.DPI is used to describe the resolution number of dots per inch in a digital print and the printing resolution of a hard copy print dot gain, which is the increase in the size of the halftone dots during printing. UpdatePixelRatio() as a handler for the change event. Starting value, after which the media query is created using Then the updatePixelRatio() function is called once to display the Ratio both as a percentage and as a raw decimal value with up to two decimal places. The updatePixelRatio() function fetches the current value ofĭevicePixelRatio, then sets the innerText of the element pixelRatioBox to a string which displays the (resolution: 2dppx) (for Retina/HiDPI displays), checks to see if theĬurrent display resolution matches a specific number of device dots per Query, which begins as (resolution: 1dppx) (for standard displays) or The string mqString is set up to be the media query itself. querySelector ( ".pixel-ratio" ) const updatePixelRatio = ( ) => updatePixelRatio ( )
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