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Image and color basics
Last updated 11/30/2015
More Help topics
About masks and alpha channels
About spot colors
About high dynamic range images
Image size and resolution
For detailed instructions, click the links below. To ask questions, request features, or report problems, visit
feedback.photoshop.com.
Note: Photoshop CC has an updated Image Size dialog box. See Resizing images for more information.
About pixel dimensions and printed image resolution
Pixel dimensions measure the total number of pixels along an images width and height. Resolution is the fineness of
detail in a bitmap image and is measured in pixels per inch (ppi). The more pixels per inch, the greater the resolution.
Generally, an image with a higher resolution produces a better printed image quality.
Unless an image is resampled (see Resampling), the amount of image data remains constant as you change either the
print dimensions or resolution. For example, if you change the resolution of a file, its width and height change
accordingly to maintain the same amount of image data.
In Photoshop, you can see the relationship between image size and resolution in the Image Size dialog box (choose
Image > Image Size). Deselect Resample Image, because you don’t want to change the amount of image data in your
photo. Then change width, height, or resolution. As you change one value, the other two values change accordingly.
With the Resample Image option selected, you can change the resolution, width, and height of the image to suit your
printing or onscreen needs.
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