When you create a new preset for a custom document size in the File ^ New dialog box, Photoshop uses the resolution values set in the Units & Rulers screen in the Preferences dialog box. The default resolution is 300 ppi for print and 72 ppi for screen. These settings affect all presets that you select from the Preset pop-up menu in the New dialog box. If you find yourself constantly changing the resolution, you can customize the settings. To take advantage of this opportunity, open the Preference dialog box to the Units & Rulers screen and then in the New Document Preset Resolutions section, specify a resolution for Print and/or Screen. For example, if the current setting of 300 ppi is too high or too low for your desktop printer, change it to 240 or 360 ppi, or whatever. This will change the resolution of all your presets for documents destined for print, such as Letter, A4, and so forth. It won't affect the document presets destined for the screen, such as 640 x 480, NTSC DV 720 x 480, HDV 1280 x 720, or D4, unless, of course, you change the default 72 ppi.
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