Perspective Editing with Affinity Photo

How to Square Windows with this Simple Tutorial

By Martin KP in Articles and Tips on Nov 24, 2019

When taking pictures of buildings it is usually desired that all lines are nicely squared up. However, the standard lens can be quite unforgiving, especially when taking pictures of squared objects at heights, such as windows looking lop-sided and out of shape. Fortunately, modern post-processing software often has tools to correct perspective errors.  

In this mini-tutorial, we'll be taking a look at how to correct the perspective using Affinity Photo. It is simple to use and gives satisfying results.

Source Image

Something's off with this photograph. However, it's easy to make it better. Unfortunately, my 40mm DA Limited has put the lines out of shape. The windows should be square but in this photograph clearly they are not.

To correct this image I took the following steps in Affinity Photo:

  • From the Tools panel, select the Perspective tool.
  • In the Perspective menu select the mode to ‘source’.
  • Move the four corners of the grid to the four corners of the window, as shown below.
  • Change the mode to Destination and switch on the Snapping tool in the upper panel. This will snap the warped window to set it rectangular.

Select source menu

Once the window is warped you can double check if everything is square by drawing a box over the window. If everything is squared up properly, take a look at the rest of the image to make sure that there were no issues caused by using the tool.

Window Square

You will notice that there will be an alteration to the whole image. We do this to keep all proportions the same throughout the image or else certain components may look especially odd, such as the bikes wheels.

In the final step crop out or paint in the areas in the lower left corner.

Corrected image pre crop

And the final image is finished:

Final image

As you can see, the final image looks much better. Not only are both the windows perfectly square, but the wheels on the bike are much more circular as well. The tool is easy to use and it can be fun trying out different looks on a building. Many people find these sort of perpective errors distracting, which takes away from your main focus. Taking care to correct the distortion will greatly enhance your images.

Before and after images.

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