Editing Raster graphics (section)

==Resolution==
{{further|Image resolution}}
{{more citations needed section|date=November 2016|talk=}}
Raster graphics are resolution dependent, meaning they cannot scale up to an arbitrary resolution without [[pixellation|loss of apparent quality]]. This property contrasts with the capabilities of [[vector graphics]], which easily scale up to the quality of the device [[Rendering (computer graphics)|rendering]] them. Raster graphics deal more practically than vector graphics with photographs and photo-realistic images, while vector graphics often serve better for [[typesetting]] or for [[graphic design]]. Modern computer-monitors typically display about 72 to 130 [[pixels per inch]] (PPI), and some modern consumer printers can resolve 2400 [[dots per inch]] (DPI) or more; determining the most appropriate image resolution for a given printer-resolution can pose difficulties, since printed output may have a greater level of detail than a viewer can discern on a monitor. Typically, a resolution of 150 to 300 PPI works well for 4-color process ([[CMYK]]) printing.

However, for printing technologies that perform color mixing through [[dither]]ing ([[halftone]]) rather than through [[overprinting]] (virtually all home/office inkjet and laser printers), printer DPI and image PPI have a very different meaning, and this can be misleading. Because, through the dithering process, the printer builds a single image pixel out of several printer dots to increase [[color depth]], the printer's DPI setting must be set far higher than the desired PPI to ensure sufficient color depth without sacrificing image resolution. Thus, for instance, printing an image at 250 PPI may actually require a printer setting of 1200 DPI.<ref>{{Cite web
  | last = Fulton
  | first = Wayne
  | title = Color Printer Resolution
  | work = A few scanning tips
  | date = April 10, 2010
  | url = http://www.scantips.com/basics3b.html
  | access-date = August 21, 2011
  | archive-date = August 5, 2011
  | archive-url = https://web.archive.org/web/20110805001736/http://www.scantips.com/basics3b.html
  | url-status = live
  }}</ref>