Step-by-step Guide To Correcting Lens Distortion In Photoshop – Image distortion is an inevitable feature of all modern images due to the limitations of lens technology and the nature of the laws of physics. Solving various image distortion problems in the digital world has become much easier with continued advances in mathematical modeling and measurements of different types of lenses in digital cameras. However, there are still situations where you cannot rely on automatic dewarping tools and must try to fix the problem manually. Remember that no image is 100% free of distortion.
For example, cell phone cameras may have completely unfamiliar lenses and characteristics (and you may not know how to test and measure correction factors). Furthermore, panoramic photos composed of multiple stitched photos create a new “virtual lens” with completely unknown and highly complex blur patterns that cannot be resolved by any automatic blur removal tool.
Step-by-step Guide To Correcting Lens Distortion In Photoshop
These are scientifically known as negative (convex outward) or positive (concave outward) curvilinear distortion, and the process of reversing or eliminating optical distortion is called rectilinear correction.
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For basic type distortion, Photoshop’s built-in tools are sufficient for corrections. Third-party plugins are recommended for complex distortion models.
Tip: All distortion tools can be used in two ways: destructive and constructive. Sometimes you can get fun and exciting results by introducing curve distortion into your images, emphasizing movement, dynamics, movement, etc.
There’s also a “Puppet Warp” morphing tool, but it’s limited to local and specific anomalies, which we definitely don’t recommend for general use unless you like to experiment. It is certainly more powerful for different types of distortion, but it requires careful preparation and patience.
Tip: To use all of Photoshop’s built-in transformation tools, the image layer must be unlocked. Open the Layers tab (or press F7 if you can’t find it) and double-click the “Background” image layer to unlock it. Another option is to select once with the mouse, right-click and select the first option “Background Layer…”. Change it to whatever name you want (default name is Layer 0) and press OK.
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When it comes to anti-distortion plugins, you can find a few titles; However, our reference selection is limited to just two names in the market:
PT Lens is highly praised for its large camera database and ability to automatically remove barrel/cushion distortions. There is a good chance that your model already matches the database. There’s also a manual blur removal section (if you can’t find the preset lens function and transfer settings), which is a bit better than Photoshop’s already built-in lens correction tool, we think the built-in tools are better for the job.
A PT lens cannot automatically resolve the types of perspective and tilt distortions, and the type of complex/mixed distortions you see in panoramic and fisheye images. Because of this, you need to edit all the images manually.
After opening a photo in Photoshop, simply launch the ePaperPress PT Lens plugin via the Filter menu. Your photo must contain EXIF ​​data and your camera/phone model must support it. EXIF data is automatically read and recognized by the PT lens, which automatically adjusts and applies barrel/cushion correction. You don’t have to do anything except hit the “OK” button to fix the barrel/cushion distortion!
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Other types of distortion (distortion/perspective shift/etc) must be corrected manually in the PT lens or using built-in Photoshop tools and other plug-ins.
Panorama Corrector is our highly recommended plugin for Photoshop because it allows you to correct highly distorted images with complex distortion patterns. It’s mainly used for panoramas, but we’ve found it useful for other easy and precise corrections, particularly perspective, barrel/pad and tilt type distortions.
Panorama Corrector isn’t perfect and can’t solve impossible distortion patterns, but it’s very close to the ideal distortion correction tool you should have in your arsenal.
For example, Panorama Corrector is not good for nature/wildlife macro photography and semi-manual corrections, almost useless, because you have no reference point to draw lines. If you do, great! – It gets better (as we demonstrate in our third video below). However, in reality, for example, if you are photographing real-life objects, you can only imagine. On the other hand, if you photograph geometric objects, it will shine to the maximum. However, practice and experience are of great help in these situations.
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Before applying a correction with the Panorama Corrector plugin, it is always a good practice to resize the image you want to correct (if it has multiple layers), increase the canvas size accordingly, and enlarge the image with a high-quality resizing algorithm.
1) Always enlarge the image before processing We skip this step in our video tutorials, obviously to save CPU/RAM. You can also use third-party zoom/resize tools like BenVista PhotoZoom Pro and S-Spline Maximum Precision Algorithm (our favorite). As machine learning/neural networks/artificial intelligence algorithms become popular, you can try them too (eg TensorZoom); It all depends on the source material and training models. 2) Increase the CANVAS size slightly to work. Space 3) Always start with simple 2 or 3 point lines, then you can switch to Bezier curves for more precise adjustments 4) Adjust (linear) coefficients to get aspect ratio [width/height] 5) Curved correction lines (horizontal and vertical) should not intersect. The program is not able to fix these images, so we need to go back to the previous step and fix it. Remember that horizontal lines should not touch the top and bottom sides and vertical lines should not touch the left and right sides. You must constrain them within the image or expand the canvas and draw them outside the virtual image area. Perspective correction in Photoshop
Perspective shift is probably the most common image distortion that occurs when shooting buildings, cityscapes, architecture, etc. This happens because you have limited space to move away from the object you want to capture, and partly due to lens distortion, with curved edges/lines you often get a “collapsing building” illusion.
How to fix “falling buildings” blur in Photoshop? How to straighten architectural images, distorted buildings and cityscapes in just a few steps? After opening the image in Photoshop, follow these steps to fix the image quickly:
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Increase the paddle size of your image (desktop) to get some editing space. It’s always a good idea to work with Photoshop’s perspective transformation tool.
Unlock your image layer (if you can’t see the Layers tab, press F7 on your keyboard or choose Window > Layer from the top menu)
Choose Edit > Transform > Perspective Tool and adjust the points/frame as best as possible to correct the angle of the image.
When you’re done and happy with the end result click the crossed circle at the top, or next to it to cancel all changes/edits.
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Tip: You can also press ESC (Escape) on your keyboard to cancel all edits and exit any transformation tools.
It looks great! All we need to do now is remove (CROP) the white space from the image and save it as a new file (watch our video tutorials for more details)
Watch the full series of video tutorials for more details on image blur and how to fix it properly in Photoshop. When you talk about perspective, you get to a deeper and somewhat more complex topic. It deals with geometry, art history, perspective etc. However, solving this big problem is not the purpose of this tutorial. Instead, he focuses on solving perspective problems in his photography using Photoshop. So read on to find out which Photoshop tools can help you.
Since perspective is a broad term, in this article I will restrict it to one point: Convergence is how straight lines diverge from each other. It can be used as a creative element of an image or to help convey a sense of depth and three-dimensionality, as in this example:
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As you walk down the street and tilt the camera upwards to photograph a building, you may be aware of this effect. Now, that may be your intention, but sometimes you don’t want or need that ambiguity. Of course, you can solve this problem by using a tilt and shift lens or a large format camera. However, many of us do not have access to this tool. Photoshop comes in handy for correcting perspective in post-production.
As always, Photoshop has different ways of dealing with the same problem. One may work better than others in different situations. However, I find that most of the time you need to combine them to get the job done. So here’s an introduction to some of the different methods:
One way to correct perspective distortion is to use a lens correction filter. You can find it in the filter menu. On selecting this option, a new window will appear. To get started, make sure you’re on the Custom tab to access the settings and configure your grid
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