Anyway, here is the guide.
Part 1: Simple Perspective correction
- The Photo has to be in 8bit mode.
- Resize the photo that you have plenty of gray space surrounding it
- Select all (CTRL+'A')
- Menu: Edit->Transform->Perspective
- Drag the upper left handle and move it to the left until the image looks good for you (this photo was intentionally a bit under corrected)
- Photoshop renders a preview pretty fast. Don't be afraid of the quality the final rendering will do much better
- Once the photo is ok hit "Enter" and Photoshop does the final rendering
- Deselect the image (CTRL + 'D')
- Ready!
Part 2: Refined Perspective Correction
- Again prepare your image as you would usually and perform steps 1-6 as above. You get the following result (don't hit "Enter" yet).
- Menu: Edit->Transform->Skew
- Drag the the upper right handle to the right to get the right part better in parallel
- Drag the upper right handle now up that you get the top better aligned
- Hit "Enter" and Photoshop does the final rendering
- Deselect
- Crop the photo
http://www.outbackphoto.com/workshop/PSPerspectiveCorrection/PhotoshopPerspectiveCorrection.html
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