Stretch & Distort the Image
Select menu
Image|Stretch & Distort
.
Target
Decide which area to be stretched and distorted: selected area or the whole image.
Stretch
New Size of the area in pixels or in proportion.
Keep Proportion
Keep the width and height proportion.
Distort
Set the distortion angle in horizontal and vertical.
Preview Zoom
Select the preview proportion of the stretching and distorting effect.