This function resizes a picture by cropping it or adding a colored border.
To reach this function, use Edit | Canvas Size [Ctrl+W].
If the Relative is not checked, then the Width and Height values determine the picture's size. To set the new size via the increase/decrease in size, rather than setting the new size directly, use the Relative option. (To set a decrease in size, use a negative value.) To set where to "anchor" the whole operation, use the Image alignment control. Increasing the canvas size adds a border around the picture. Click Color to set its color using the Windows color picking window. Click the eyedropper to set the color by clicking a color in the picture.