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Corel AfterShot Pro 2 Manual

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Barrel and Pin Cushion distortion is commonly referred to simply as lens distortion. This is caused from nonuniform
magnification of the image from the outside of the image (perimeter) to the center. Barrel distortion refers to a rounded
effect in an image caused by diminished lens magnification towards the edges. Pin cushion distortion refers to a pinched
or narrowed appearance at the sides of an image. Each lens has its own Barrel and Pin Cushion characteristics, and by
analyzing a set of images from a lens at all focal lengths, this distortion can be removed. Corel AfterShot Pro includes
profiles for several hundred lens and camera combinations.
Chromatic Aberration distortion (known as CA distortion) is a result of the nonuniform bending of light as it passes
through a lens. The result is a color fringe (often appears purple) and uneven colors around edge details in high contrast
scenes, such as branches of a tree silhouetted against a bright sky. Zoom lenses, particularly at their widest and longest
focal lengths, exhibit the most severe distortion. CA distortion can be removed by adjusting the data for the colors that
show the most distortion.
Vignetting is the darkening of corners of an image due to light fall-off, and can be caused by optics (the lens itself), the
sensor (many sensors are less sensitive to light that hits the sensor at an angle), or from other causes like a filter or lens
hood that shades the corners of an image. Vignetting can be corrected by brightening the corners of an image. In some
cases, photographers chose to add a vignette effect to their photos to draw focus to the central subject. You can use
Corel AfterShot Pro to remove an unwanted vignette or add a vignette. When you add a vignette, it is always performed
on the cropped portion of the image, while correcting vignette is applied to the entire original frame.
Add a vignette
The Lens Correction section contains the following controls:
The top section controls Barrel and Pin Cushion distortion, and contains two tabs: Database and Manual.
The Database tab is used when you want to correct your images based on camera and lens profiles built into Corel
AfterShot Pro.
 Enable correction — toggles Lens Correction on or off.
 Resize image — enable to automatically scale the image to fill the image frame. Do not enable if you want to fill the
empty sections of your image manually.
 Manufacturer, Model, Lens — these drop-down menus show what camera and lens Corel AfterShot Pro assumes your
image was taken with. Some cameras and lenses include data in the image file that allows the application to
determine exactly what camera and lens was used, but other times the application "guesses" the closest option based
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