Bedienungsanleitung Corel AfterShot Pro 2 (Seite 35 von 100) (Englisch)

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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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Corel AfterShot Pro 2 Seite 35

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