Digital Outback Photo
- Photography using Digital SLRs


Perspective corrections using Photoshop

by Uwe Steinmueller

 
I learned the initial concept from Ian Lyons @ the ComputerDarkroom. Now it is just routine to perform these operations.
 
Part 1: Simple Perspective correction
 

    

On the left is the original and on the right the corrected version

 
This correction is very easy in Photoshop. First prepare your image as you would usually (I even sharpen before but this might be less than optimal). The next screen shot illustrates what to do in Photoshop
 
 

The steps:

  1. The Photo has to be in 8bit mode.
  2. Resize the photo that you have plenty of gray space surrounding it
  3. Select all (CTRL+'A')
  4. Menu: Edit->Transform->Perspective
  5. 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)
  6. Photoshop renders a preview pretty fast. Don't be afraid of the quality the final rendering will do much better
  7. Once the photo is ok hit "Enter" and Photoshop does the final rendering
  8. Deselect the image (CTRL + 'D')
  9. Ready!
 
Part 2: Refined Perspective correction
 

Before and after

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).
 

But this time it needs extra correction on the right side of the photo.

  1. Menu: Edit->Transform->Skew
  2. Drag the the upper right handle to the right to get the right part better in parallel
  3. Drag the upper right handle now up that you get the top better aligned
 
 

After step 9 we your screen looks like the above screen shot

  1. Hit "Enter" and Photoshop does the final rendering
  2. Deselect
  3. Crop the photo
 
This simple procedure helps you to enhance many of your architectural shots. Hope you found this basic introduction helpful.
 
Samples

 

  
 
The above photograph is taken from an outdoor poster at the Hundertwasser house in Vienna. The final result (on the right) was created using the technique described in this article (kew and crop).
 
 
 

 

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