In order to change the dimensions of your image, you can either resize the canvas or resize the image and the canvas together. However, using the latter resizing method is more advisable since it maintains the appearance of your image.
1. Select Canvas menu ▸ Resize and the Resize dialog box will appear.
2. In Resize dialog box, select the Constrain File Size check box to preserve width-to-height relationship and to avoid distorting the image.
3. Specify the desired size values in the Width and Height boxes. If the Constrain File Sizebox is 'checked', then enter a value in one of these boxes.
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