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Image and color basics
Last updated 11/30/2015
About monitor resolution
Your monitor’s resolution is described in pixel dimensions. For example, if your monitor resolution and your photos
pixel dimensions are the same size, the photo will fill the screen when viewed at 100%. How large an image appears
on-screen depends on a combination of factors—the pixel dimensions of the image, the monitor size, and the monitor
resolution setting. In Photoshop, you can change the image magnification on-screen, so you can easily work with
images of any pixel dimensions.
When preparing images for viewing on-screen, you should consider the lowest monitor resolution that your photo is
likely to be viewed on.
About printer resolution
Printer resolution is measured in ink dots per inch, also known as dpi. Generally, the more dots per inch, the finer the
printed output youll get. Most inkjet printers have a resolution of approximately 720 to 2880 dpi. (Technically, inkjet
printers produce a microscopic spray of ink, not actual dots like imagesetters or laser printers.)
Printer resolution is different from, but related to image resolution. To print a high quality photo on an inkjet printer,
an image resolution of at least 220 ppi should provide good results.
Screen frequency is the number of printer dots or halftone cells per inch used to print grayscale images or color
separations. Also known as screen ruling or line screen, screen frequency is measured in lines per inch (lpi)—or lines of
cells per inch in a halftone screen. The higher the resolution of the output device, the finer (higher) a screen ruling you
can use.
The relationship between image resolution and screen frequency determines the quality of detail in the printed image.
To produce a halftone image of the highest quality, you generally use an image resolution that is from 1.5 to at most 2
times the screen frequency. But with some images and output devices, a lower resolution can produce good results. To
determine your printers screen frequency, check your printer documentation or consult your service provider.
Note: Some imagesetters and 600-dpi laser printers use screening technologies other than halftoning. If you are printing an
image on a nonhalftone printer, consult your service provider or your printer documentation for the recommended image
resolutions.
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