Mark Today’s Question
I’m revisiting an older file I captured years ago. I really like the image, but the unprocessed RAW file has some red artefacts that I can’t seem to correct. Is it normal to see artefacts in an unprocessed RAW file?
Mark’s Answer
The colour fringing you’re seeing is chromatic aberration, which can be corrected using the Lens Corrections panel in Lightroom Classic or the Optics adjustments in Camera Raw or Lightroom.
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Chromatic aberrations are a type of visible artefact caused by certain lenses, particularly wide-angle or lower-quality lenses. Fortunately, they can usually be corrected with relative ease.
Start by enabling the “Remove Chromatic Aberration” checkbox in the Profile tab under Lens Corrections in Lightroom Classic or Optics in Camera Raw/Lightroom. This works well in about half of cases. If the issue persists, switch to the Manual tab for finer adjustments.
In the Manual section, adjust the Amount sliders for Purple and Green, depending on which colour fringing is present. These sliders control the strength of the correction applied.
Additionally, use the Purple Hue and Green Hue sliders to refine the range of colours being corrected. Expand the range enough to cover the chromatic aberration but not so much that it affects surrounding colours. For example, extending the Green Hue range too far into blue might unintentionally alter areas of sky.
By carefully adjusting the correction strength and colour range, you can significantly reduce chromatic aberrations – often achieving complete correction without any remaining colour artefacts.
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