Correcting Image Distortions and Color Blur (Lens Aberration Correction Function of Digital Photo Professional)
01-Sep-2008
8200328600
Solution
Some lens characteristics could cause the periphery of images shot to become darker than the center, or cause the subject to be distorted. In such cases, you can use the lens aberration correction function of Digital Photo Professional. Using this function, you can improve the following phenomena, which cannot be completely eliminated in the lens structure, to make images that are closer to what you intended.
Phenomena that can be corrected:
- Diminished peripheral illumination (the amount of light at the periphery of an image)
- Distortions (distorted lines)
- Chromatic aberration (color fringing that occurs in the periphery of an image)
- Color blur (blue or red color blur that sometimes occurs at the edge of the highlighted area of an image)
About "Compatible Cameras" and "Compatible Lenses", please refer to the Related information.
NOTE
- You can also correct RAW images taken with the compatible lens even when the extender is attached.
- The aberration correction function is not available for images shot with combinations of camera/lens other than those given under "Compatible Cameras" and "Compatible Lenses". They are therefore not displayed and cannot be used.
Follow the procedure below to correct lens aberration.
1. Start Digital Photo Professional and display the main window.
2. In the main window displayed, if you double-click the RAW image to be corrected, the edit screen and tool palette appear.
REFERENCE
Select [View] menu and [Tool Pallete] when the tool palette does not display.
3. Select the <NR/Lens/ALO> tab and click [Tune].
4. When the [Lens aberration correction] window appears, select the items to be corrected. This section describes how to correct [Peripheral Illumination] and [Distortion].
5. The image is corrected and redisplayed.
To adjust the correction amount, drag the slider from side to side.
REFERENCE
You can correct red chromatic aberration with the [R] slider of the [Chromatic aberration] or blue chromatic aberration with the [B] slider.
When the corrections are complete, click [OK].
6. When closing the [Lens aberration correction] window, the result of the corrections is reflected in the image in the edit window, and the image is redisplayed.
In the main window, the [ 
] mark is displayed on the image to indicate the lens aberration corrections.
] mark is displayed on the image to indicate the lens aberration corrections.
Thumbnail Image Displayed in the Main Window
NOTE
About Shooting Distance Information Slider
- When correcting RAW images shot with EOS-1Ds Mark III, EOS-1D Mark III, EOS 50D, EOS 40D, EOS DIGITAL REBEL XSi/450D or EOS DIGITAL REBEL XS/1000D, if shooting distance information has been saved to the image, the slider is set automatically according to this shooting distance information. However, if no shooting distance information is saved to the image, the slider is set automatically to the right end at infinity position. If the image's shooting distance is not infinite, you can minutely adjust the distance by operating the slider while looking at the screen.
- When correcting RAW images shot with EOS-1D Mark II N, EOS-1Ds Mark II, EOS-1D Mark II, EOS-1Ds, EOS-1D, EOS 5D, EOS 30D or EOS DIGITAL REBEL XTi/400D DIGITAL, it is set automatically to the right end at infinity position. You can then minutely adjust the distance by operating the slider while looking at the screen if the shooting distance is not infinite.
- [Shooting distance information] slider is applied to all the correction items with check marks.
This completes the process of correcting lens aberration.