What happens next?

How to use photofiltre
Resize an image in photofiltre.
Click the " image " tab on the menu bar and select " image resize " from the drop-down menu.
Adjust the entries in the width and height fields using the corresponding up and down arrows next to each field.
Adjust the entries in the resolution field to lower or increase the resolution of the image. Notice that the preserve aspect ratio field is selected, so that the original aspect ratio will be maintained.