Adobe Photoshop gives you the power to create and alter graphics with a wide variety of features and options, which makes it a good fit no matter what you're attempting to do. One such option is the ability to resize images, letting you choose new dimensions for it. Using this effect, you can enlarge an image to whatever size you want.
Resizing Options
Photoshop lets you resize an image to whatever dimensions you want, which gives you a lot of freedom over what the final image will look like. While you can choose both width and height independently, you can also enable the "Constrain Proportions" option; with this, width will adjust in direct proportion to height, which means that there will be no unevenness or distortion in the image.
Use
Enlarging an image is useful for when you have an image that's too small to be seen properly, or if you need an image to be of specific width and height, which is more common when designing websites. If you're not making major adjustments, it can save you the trouble of cropping or creating a whole new image.
Process
Open your image in Photoshop. Click "Image" on the top menu, and then click "Image Size." If not already selected, change the drop-down selection from "Percent" to "Pixels." Enter in the new pixel size you want in the "Width" and "Height" boxes that display the image's current size. Optionally, click the "Constrain Proportions" box to get proportional resizing. Click "OK" when finished.
Considerations
If you're planning to drastically enlarge an image, be prepared for some significant loss of quality. Photoshop doesn't yet have the technology to enhance images modified by size, so the enlarged image will be comprised only of the data that's in the smaller version; in essence, everything will be expanded, so some blurring and noise may occur. However, if you're making only minor size adjustments, the differences shouldn't be too noticeable.
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