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adaptive wide angle correction

Photoshop's lens correction filter or the respective Bridge feature are often not good enough in correcting the geometrical distortions associated with using wide-angle or fisheye lenses. In Photoshop CS6, Adobe introduced the Adaptive Wide Angle filter which can prove very useful & intuitive. Let's check how it works.


Decompress the tutorial photo and load it in Photoshop CS6. 

Before editing the photo, do something simple yet fundamental to non-destructive editing: convert the background layer into a smart object: Go to the layers panel, right click the background layer and select "Convert to Smart Object". Photoshop will retain the original pixels into the smart object layer. All your edits with the Adaptive Wide Angle will be saved into a "smart filter" which you can double click any time and re-work your settings.

From the main menu select: Filter > Adaptive Wide Angle. The filter window shows up.
At the top left you can see the filter tools that let you apply the so-called "constraints", or zoom and pan. You can use the two constaint tools to draw a line or a polygon respectively, in order to selectively straighten the distorted areas of your photo:
contraints

On the upper right of the filter window there are a number of settings associated with the way Photoshop applies the geometrical corrections. Photoshop will analyze the photo file and automatically select the best type of correction. The Auto mode usually works very well. Below these settings you can see a preview window that lets you place the constraints more accurately.

Click on the Constraint tool (the first tool at the top left) and draw a line from point A to point B.
ab-1

This line is parallel to the the floor; in other words it is horizontal. Therefore we can assign the horizontal attribute to this constraint: right-click on the line and select "horizontal" from the menu:
horizontal

Now draw a horizontal line from A to B, as shown below:
ab-2

Repeat the above steps to straighten the roof.

The wooden columns look curved. Draw a line from A to B the way shown below, to straighten the left column:
ab-3

The column is vertical, therefore we can assign the vertical attribute to this constraint. Right click on the line and select "Vertical" from the menu:
vertical

TIP: Holding down the Shift key while dragging will automatically assign the horizontal (or vertical) attribute to your constraint.

Now extend the constraint by clicking and dragging from point A to point B, to straighten the walls:
ab-4

Repeat the same steps to straighten the other columns and the walls. 
If necessary click and rotate the marks on the circles to fine tune the constraints:
fine-tune

Click OK when finished.

Such distortion corrections create transparent areas along the edges of the photo. We can use the Content-Aware tools to fill these areas:

Select the Magic Wand Tool (press W). Hold down Shift and click inside each transparent area. 
Choose : Select > Modify > Expand from the main menu, enter 3 pixels and hit OK. 
Press Shift and F5, to invoke the Fill menu. Click on "Use" and select "Content-Aware". Hit OK
Press Ctrl-D (PC) or cmd-D (Mac) to deselect.

Compare the photo before and after applying the Adaptive Wide Angle filter:
wide-angle-correction-before
wide-angle-correction-after

With regards to the "Lens Corrections" available in Adobe Camera Raw (or in Lightroom):

You can use the "Lens Corrections" panels to remove the Chromatic Aberration or Lens Vignetting, prior to using this filter in PS. Do not apply any kind of geometric distortion corrections in ACR. This is the ideal workflow, if you wish to process the photo with the Adaptive Wide Angle filter.

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