http://resureksi.com Ressurrection Thu, 31 Jul 2008 23:54:29 +0000 en hourly 1 http://wordpress.org/?v=3.2 http://resureksi.com/online-tutorials/art-and-design-tutorials/picking-an-image-resolution/ http://resureksi.com/online-tutorials/art-and-design-tutorials/picking-an-image-resolution/#comments Tue, 08 Jul 2008 12:34:06 +0000 asu http://resureksi.com/?p=66 After you have the concept of resampling under your belt, how do you know what size you should be resampling to? How many pixels do you need? Here are your general guidelines:
Photos for your inkjet printer:
Inkjet printers are stochastic printing devices: That is, they use a series of droplets to replicate each pixel in your image, as shown in Figure 2-12. In theory, the optimal image resolution is ƒ1?3 of the printer’s rated resolution.
For example, a printer rated at 720 ppi works best with images at 240 ppi.
1,440 ppi printer, the formula calls for an image resolution of 480 ppi (and that goes for the 2,880 x 1,440 printers, too). However, most folks find that regardless of the printer’s rating, they never need an image resolution higher than 300 ppi.
Web images: Ignore resolution. Ignore the entire Document Size area of the Image Size dialog box. Consider only the image’s pixel dimensions. Determine what area of the Web page the image will occupy and then resize to exactly those pixel dimensions.
Page layout programs and commercial printing: If your image is to be placed into a page layout program’s document and sent to a commercial printing facility, you need to know the line screen frequency (the resolution, so to speak) of the printing press on which the job will be run. Ask the print shop or the person handling the page layout. Your image resolution should be either exactly 1.5 times or exactly twice the line screen frequency. (You shouldn’t notice any difference in the final printed product with either resolution.)
PowerPoint presentations and word processing documents: Generally speaking, 72 ppi is appropriate for images that you place into a presentation or Word document. You should resize to the exact dimensions of the area on the page or slide that the image fills.

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