The first and most practical use for this tool is to use it to resize a graphic. To resize your graphic proportionally, grab on to the lower right handle with the right mouse button depressed and press inward to scale the graphic down and pull outward to scale the graphic up. The advantage to this method of resizing a graphic (rather than using the Image>Resize feature) is that you can see your graphic resize interactively and can better judge when you have the image the correct size.

When you are working on an image you want to deform, always have that image on a separate layer. Once you have placed an image to deform, click on the deform tool, then on your image. Your image will now have handles in the corners and a bar in the middle as illustrated in the following example:

When you hover the cursor over the right handle on the middle bar, the cursor thurns into two curved arrows in opposite directions. When you are in this state of the Deform tool, you can rotate your graphic by moving your mouse up or down.

The handles on the Deform tool can be manipulated in three ways. The first is by clicking on any handle with the left mouse button. This will turn the cursor into a "cross hair" with a rectangle box (example on left below). This allows you to make an image wider, narrower, shorter or taller. Just grab a handle and push or pull.

The second option you invoke by holding down the Shift key while clicking on a handle. This will turn the box next to the cursor into an angled box (see example in the middle below). This option allows you to slant your graphic to the right or to the left. The last option you invoke by holding down the Ctrl key when you click on a handle. This will turn the box next to the cursor into a box with the top handles proportionally inward (see example on the right below). This option allows you to proportionally disort the sides of the graphic inward or outward.

The Deform tool for Perspective

1. Download the door graphic above to your hard drive.
2. Open the door graphic.
3. Use the selection tool to select the "door" part of the image.
   
   
4. Choose Selections>Promote to Layer.
5. With your selection still active, click back on the door layer and choose Edit>Clear. This will clear the "door" portion of the door graphic, leaving the outlying areas of the graphic intact.
6. Turn off all layers except for the promoted door layer.
7. Click on the promoted door layer and make a selection for the right half the door.
8. Choose Selections>Promote to layer.
9. Click back on the layer that has the whole door and choose Selections>Invert.
10. Choose Selections>Promote to layer. You should now have the two halves of the door on separate layers.
11. Delete the layer with the whole door and turn the remaining layers back on.
12. Click on the Deform tool then on your selection.
13. Click on the right half of the door layer. Select the door with the rectangle selection tool.
14. Click on the deform tool then on the layer with the right half of the door.
15. Hold down the Ctrl key and grab the top left corner handle. Pull the handles inward.
    
    
16. Repeat with the left side of the door.
17. Drag the sides of the door to the right and to the left a few pixels and shave off the outside edges to align with the inside door panel on the bottom graphic.
    
    
18. To have your doors open outward, rather than inward, repeat the above process except you will want to pull outward rather than inward in step 15.