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Automatically Correcting Lens Distortion

You can correct barrel and pincushion distortion in digital photographs. In barrel distortion the photo appears to bulge outwards from the center. In pincushion distortion the photo appears to shrink inwards toward the center. Barrel and pincushion distortion are common in photos that were taken with wide angle or zoom lenses.

In ACDSee Professional, you have the option of using manual correction via the Manual Correction slider, or you can enable lens correction via your lens profile. This can be done by selecting the make, model, and lens of the camera used to take your image. The Lens Correction tool can apply automatic adjustments based on the distortion inherent to the lens used, or you can enable lens correction for each image manually. The Lens Correction tool contains a database of camera makes, models, and their possible lenses. The possible lenses for the selected camera will be available for you to choose from the Lens drop-down menu, unless there is only one possible lens, in which case, that lens will be pre-selected.

You can find the name of the lens used in the Current Lens Information section. However, the lens value displayed in the EXIF may not be reliable in the case of third party lenses as the camera itself may only recognize the third party lens as an ID number. If possible, recover the correct lens value from the Info palette in Edit mode, (but outside of the Lens Correction tool), and select it from the Lens drop-down menu (inside the Lens Correction tool).

You can use the Manual Correction slider for further adjustments after using automatic correction, or on its own.

You can also use your lens profile to correct chromatic aberration, if it is available.

For quick viewing of the available lens profiles, go to Lensfun.

To Fix Lens Distortion Using Your Lens Profile:

In Edit mode, in the Geometry group, select Lens Correction.

You can also access the Lens Correction tool from the Filter drop-down menu or Filter toolbar.

Check the Enable Lens Profile checkbox.
If the displayed camera make and model are not correct, select the correct options from the Make and Model drop-down menus.
From the Lens drop-down menu, select the lens used to take the image. You can find this information displayed in the Current Lens Information section. The correction will occur automatically.
If you desire further adjustments, move the Strength slider in the Manual Correction section to the left for a bulge effect, or to the right to stretch the edges of the image.

You can right-click a slider to reset to the default value.

Check the Show Grid checkbox to display a grid over your image. This tool is useful when fixing alignment in your images.

To Fix Chromatic Aberration Using Your Lens Profile:

Chromatic aberration occurs due to the properties of a given lens. Therefore, you can use the lens profile to automatically correct it. The Chromatic Aberration checkbox will be checked if your selected lens has a corresponding chromatic aberration correction available.

In Edit mode, in the Geometry group, select Lens Correction.
Select the Enable Lens Profile checkbox.
Select the Chromatic Aberration checkbox.

To Fill in the Edges of a Manually Corrected Image:

Some manual adjustments may affect the edges of the image. You can choose what color will fill the discrepancies created by the lens correction.

Select a color from the Background Color drop-down menu.