Lens Correction Tool – RAW only Pro

Lens Correction / LCC / Generic Lens Profile / Vignetting

Use the Lens Correction tool to address a number of unwanted issues commonly associated with lens distortion.

The Lens Correction tool is designed to address a number of unwanted issues that are commonly associated with lens distortion. Capture One incorporates a number of preset profiles that are available for medium format lenses and will greatly improve image results when used appropriately.

Introduction to Lens Correction

Correct almost any lens using the Generic or Generic Pincushion Distortion profiles available in the Lens Correction tool. These profiles address most detrimental issues related to any simple spherical lens. Complex distortion however, can only be fully corrected with specific preset profiles.

Some effects, such as Chromatic Aberration and Purple Fringing may depend on Aperture Value and Focal Length. To overcome any unwanted variances, try creating and saving a preset for lenses that you most frequently use.

Geometric Distortion, often referred to simply as Distortion, causes straight lines to appear curved. This distortion is especially pronounced with images that are captured with a wide-angle lens.

Find all lenses recognized by Capture One Pro in the Lens drop down menu in the Lens Correction tool. If a lens is not recognized by Capture One Pro, it may be listed in the Preset Menu. These settings are produced by the Phase One Developers team and will perform standard corrections for each selected image.

Check mark the Hide Distorted Areas box within in the Lens Tool tab to hide distorted areas of an image after Lens Correction or Keystone Correction have been applied. In special cases you might, after Lens correction or Keystone correction is applied, need to crop outside the actual captured pixel material.

See Crop and Keystone Correction.

Digital Back – To Apply a Specialized Lens Profile

  1. Go to the Lens tool and select the Lens Correction tool tab.
  2. Select an image and choose a specific lens profile from the Lens drop-down menu.
    (Chromatic aberration is enabled, Light Falloff is set to 10% and the distortion is set to 100% once a profile is selected).
  3. Fine-tune by adjusting the Light Falloff and Distortion sliders.
  4. Zoom to 400% to inspect any details close-up.
    Check mark the Purple Fringing box if necessary to reduce or eliminate any purple or blue fringes that can be often seen on the edge of objects.

See Chromatic aberration and Sharpness falloff

Lens Cast Calibration

If your specific lens model is not supported in the Lens Correction tool, then a LCC profile is the approach for lens correction.

Photograph a LCC (Lens Cast Calibration plate) to create a test shot for an up-to-date LCC profile of a particular lens. To get an exact profile and optimal correction, the LCC test shot should be created with the same lens and shutter setting as the intended corrected images.

Alternatively, use a similar LCC test shot if you keep a library of previously captured LCC images. (Phase One does not recommend selecting the Dust Removal check box with this generic approach to lens correction).

Create and Apply an LCC Profile

  1. Select the LCC image.
    (I.e. the image captured with the white plate).
  2. Select Analyze from the LCC drop down menu.
  3. Give the LCC profile a name and press Save.
  4. Capture One will now analyze the image and create the LCC profile.
    When completed, the check box Color Cast is selected.
    The color differences across the image should now be even.You can now apply the LCC to other images that were captured with the same camera.
  5. Select the image to be corrected and apply the newly created LCC profile from the LCC drop down menu.

Note: You get the best result if you use a specialized Lens Profile and an LCC together.

Important: For best results, the LCC should be created under the same conditions as any images that you intend to correct. This includes focal length, aperture and (when practical) ISO. Tilt and Shift adjustments on a camera must match for best results. ISO and exposure settings can be changed to improve exposure if necessary.

If Light Falloff is check marked from the LCC options, the Lens Cast Calibration will replace the falloff specified by the lens profile. The LCC will provide the most accurate correction if it accurately reflects the conditions of an image.

Note: You will get a flat image if you set the correction to 100% (selected by default when the LCC Light Falloff is check marked).

DSLR – To Apply a Generic Lens Profile

  1. Go to the Lens tool and select the Lens Correct tool tab.
  2. Select an image and choose a generic lens profile from the Lens drop down menu.
    All sliders in the tool are reset (no default setting for a generic lens).
  3. Set the desired adjustments with the sliders.
    For better correction use an LCC profile.

See To Create and Apply an LCC Prolife. 

Generic Lens Profile – To Correct for Chromatic Aberration

  1. Go to the Lens tool and select the Lens Correct tool tab.
  2. Select an image and the Generic profile from the Lens drop down menu.
  3. Select Analyze in the Chromatic Aberration drop down menu.
    The image is analyzed and the correction is enabled.
  4. Inspect the image.

Note: Chromatic Aberration is enabled by default if a specialized lens profile is selected. You can still choose to analyze an image to get a custom correction.

Tip: Inspect an image for chromatic aberrations by looking at high-contrast edges that run perpendicular to the center of an image. Examine the image at 400% and set saturation to a high level during the inspection.

Soft Corners
Soft corners can occur for many reasons and commonly transpire when a wide-angle lens is used. Soft corners are often seen as a desired retro-focus effect.

However, Capture One can help correct this effect if it is unwanted with the Sharpness Falloff tool. Set your lens profile to 100% to fully correct this issue (if you have one). Otherwise, experiment to get an appropriate setting.

Correct for Sharpness Falloff for Generic Lens

  1. Go to the Lens tool and select the Lens Correct tool tab.
  2. Select an image and check mark Sharpness Falloff.
  3. Zoom to 400% to inspect a close-up section of the image.
  4. Adjust the Sharpness Falloff slider while inspecting the areas towards the corners for sharpness falloff.

Using Vignetting

Vignetting is a controlled exposure adjustment that will either darken or brighten the edges and corners of an image. The edges and corners will be appear brighter when the EV value is added and darker when it is reduced.

Note: Vignetting will be effected by any color tone that is applied to an image including the styles Sepia and Blue tone.

Learn More

Light Falloff
Light falloff arises because an image is exposed more at the center of the frame than at the corners. The distance from the lens to the backplane is longer at the edges than it is at the center and, therefore, less light can get through the lens at oblique angles. This means corners are exposed less than the center, resulting in darker corners than the center.

This effect is most common with wide-angle lenses that are used with a wide-open aperture. If you have a profile for your lens, set the amount to 100% to get a completely flat and even looking image. Otherwise, use a generic profile and manually set the desired amount with care.

Chromatic Aberration
Chromatic Aberration (CA) occurs because light of different wavelengths takes different paths through the lens that may not be in focus on the backplane. As most light is a mix of several wavelengths, the lens will focus the colors differently and create color fringes on edges of high contrast areas.

Since CA results from colors that have shifted, a white or light color on a dark background will have colors on either side. The most common manifestations of the error are seen as red/cyan and blue/yellow but others are possible. One of the more unsightly is green/purple but this should not to be confused with Purple Fringing.

Brass, chrome and other metallic products often give rise to extreme contrast that can generate Purple Fringing. Purple Fringing (PF) is, like Chromatic Aberration, an artifact that occurs because a lens interacts differently with light of varying wavelengths. Unlike Chromatic Aberration, Purple Fringing will not usually show fringes of different colors. PF is mostly visible on the edges of very high contrast image areas, such as metallic products or branches on a tree against a bright sky.

Purple Fringing is often seen on images that also show Chromatic Aberration. Wide-angle lenses are more likely to show this artifact.