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Chapter 2. Creating and Managing Images > Changing Image Size and Resolution

Changing Image Size and Resolution

Pixel dimensions, image dimensions, and resolution are all adjusted using the Image Size dialog box. You will often capture one image and then use it for different purposes, so it’s important to understand how these adjustments affect your image file.

For the Web and other onscreen viewing, it’s common to adjust the pixel dimensions, or number of pixels, to control the resolution and/or file size of the image. This is known as resampling. The Resample Image check box is probably the most important feature to understand. When this box is checked, the pixel dimensions change—that is, the pixels will increase or decrease in number as the image is resampled (Figure 2.25). When the box is not checked, the pixel dimensions are locked in, and no resampling can occur—you can change the document size (the size the image will print) but the size the image displays onscreen will stay the same.


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