Your screen resolution determines how large the image appears to be. Images are of a fixed pixel size when they appear on your monitor. To find out what your screen resolution is, choose Start > Control Panel > Display > Settings and look at the screen resolution (Windows) or System Preferences > Displays and look in the resolution section (Mac OS). For example, large monitors typically display higher resolutions than small monitors because they have more pixels. There are several different screen resolutions you can use, and the physical size of the monitor screen usually determines the resolutions available. For example, a monitor with a screen resolution of 640x480 pixels will display 640 pixels for the width and 480 pixels for the height. The screen resolution of your monitor is the number of pixels that your monitor can display.

If you understand these differences, then you can develop a better understanding of which settings to change when you resize an image. The size of an image when you view it on the screen is different from the size of an image when you print it. If you resize and crop images without being aware of the concepts involved, then you may see unexpected results. These concepts affect how the crop tool options operate as well. To get the best result when you resize images, you should understand the concepts behind and the results of each method of resizing. Each way to resize an image has advantages and drawbacks. You can resize your images in several ways using Adobe Photoshop and Adobe Photoshop Elements. Support Knowledgebase Resize and Crop images in Photoshop and Photoshop Elements

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