Straighten a crooked photo

Step 1 - Open your crooked photo
Open your crooked photo. Take note of where the image's true "horizon" should be, or an area on the photo that you know should be aligned to the horizon. (Note that Paint Shop Pro 9's Sample Images folder contains a photo called Straighten.jpg that works well for this Quick Guide.)
Step 2 - Select the Straighten Tool
From the Tools toolbar, select the Straighten tool-- by default it's grouped with the Deform tool.
Select this tool for me.
Step 3 - Adjust the Guideline
Notice the guideline on the image. Adjust the guideline along the axis you wish to straighten. Drag the guideline to move it. Adjust the guideline angle by dragging its ends, or by entering a value in the Angle numeric edit control in the Tool Options palette.
Step 4 - Apply the Correction
Click Apply in the Tool Options palette, or double-click inside the image. The image will rotate so that the guideline becomes the new horizon.
Notes and Tips:
Although similar to the Rotate command, this is more powerful in that you graphically straighten the photo based on its contents.
Be aware of the Crop image and the Rotate all layers options in the Tool Options palette. Refer to the Help system or User Guide for more details on this feature.

Learn More:
Crop an image
Correct perspective distortion