After scanning or importing an image, you may need to adjust its size. In Photoshop, you can use the "Image Size" dialog box to adjust the pixel dimensions, print size, and resolution of the image; whereas in ImageReady, you can only adjust the pixel dimensions of the image.
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To get help with resizing images and resampling in Photoshop, select "Help" > "Resize Image." This interactive guide will assist you in scaling the image for use in printing or online media.