Resizing an image is one of the best ways to maintain image quality, but make the file size small enough to be suitable for a Web Page.

Click on the Image Menu

Click on Resize

The current image size will be displayed. In  the example to the right the width is 639 pixels and the height is 919 pixels.

A pixel is a picture element and the average screen supports a pixel width of 640 and height of 480.

Note that  Maintain aspect ratio is selected. This is important so that when you change the height, the width will automatically adjust so that the picture resizes in proportion i.e. it does not distort and become too wide or too thin.

Then click on OK.

You will notice that the picture has changed its size on your screen.