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How to Convert to High Resolution in Photoshop
by Elizabeth Mott
Extreme increases in image resolution produce equivalently extreme pixelation.
Creating high-resolution files for use in print production may form one of the mainstays of your professional workflow, especially if you're a graphic artist or print production specialist. If you're presented with low-resolution files and asked to make high-resolution versions of them, you'll achieve better results if you can obtain natively high-resolution files to begin with. Some low-resolution files actually can become high resolution without a loss of image quality, depending on the size at which you need to reproduce them. At the same time, however, some files require upsizing to make them meet your resolution needs.
Reinterpret Resolution
1. Open your file in Adobe Photoshop. Press "Shift-Ctrl-I" to open the Image Size dialog box.
2. Examine the Document Size statistics in the Image Size dialog box. If you see large width and height measurements with a resolution of 72 pixels per inch, your image probably originated from a digital camera. Turn off the "Resample Image" check box and set the resolution to 300 ppi. At the top of the dialog box, notice that the Pixel Dimensions -- width, height and file size -- remain unchanged, whereas the width and height in the Document Size section drop. For example, an 8-bit RGB image that measures 25 inches by 16.667 inches at 72 ppi measures 6 inches by 4 inches at 300 ppi, but remains 6.18MB in file size. Click on the "OK" button to apply your settings.
