1 Choose Image > Image Size.
2 Change the print dimensions, image resolution, or both:
• To change only the print dimensions or only the resolution and adjust the total number of pixels in the image proportionately, make sure that Resample Image is selected. Then choose an interpolation method. (See "Choosing an interpolation method" on page 66.)
• To change the print dimensions and resolution without changing the total number of pixels in the image, deselect Resample Image.
3 To maintain the current proportions of image width to image height, select Constrain Proportions. This option automatically updates the width as you change the height, and vice versa.
4 Under Document Size, enter new values for the height and width. If desired, choose a new unit of measurement. Note that for Width, the Columns option uses the width and gutter sizes specified in the Units & Rulers preferences. For more information, see "Using columns (Photoshop)" on page 44.
5 For Resolution, enter a new value. If desired, choose a new unit of measurement.
9 To return to the original values displayed in the Image Size dialog box, hold down Alt (Windows) or Option (Mac OS), and click Reset.
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