You can change the printer resolution in a photo by changing the DPI (Dots Per Inch) in Photoshop. If you plan on printing your image or incorporating the image into a document that will be printed, you will need to consider using 300 DPI. the industry standard for any image you plan on printing is 300 DPI.
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Step
Open Adobe Photoshop by clicking on the program icon. If you do not see the icon on your desktop click, Start > All Programs > Adobe Photoshop.
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Click File > Open and a dialog box will appear. Click "My Documents" on the left-side. Now click "My Pictures" on the right-side, and you will see all of the pictures you have available.
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Click on the picture you want to convert to 300 DPI. Click "Open," and the picture will be displayed in Adobe Photoshop.
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Click Image > Image Size and the "Image Size" dialog box will appear with pixel and document information. In the "Document Size" section change the number in "Resolution" to 300 and choose pixel/inch from the "Resolution" drop-down menu.
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Verify that "Resample Image" is not selected and click OK. You have changed the resolution to 300 DPI without changing other picture attributes, such as the size.
