antoine_hlmn's profile

1K Messages

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16.9K Points

Tue, Jan 1, 2019 12:32 PM

Lightroom CC: Circular banding in shadows with lens correction

The lens corrections tools adds some kind of circular banding in the shadows.Here are two pictures to illustrate the issue:Without lens corrections:With lens corrrection:Those pictures are, of course, for illustration of the issue but IT IS visible in real world images.

Responses

148 Messages

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2.4K Points

3 y ago

could it be that you chose  a fish-eye lens correction which wold explain why? anyhow, it looks rather odd

Champion

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3.7K Messages

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61K Points

3 y ago

This looks like moire. It could occur because the image is so noisy. When you apply the profile, you slightly distort the image and that means the noisy pixels are remapped, resulting in moire patterns.

110 Messages

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1.7K Points

3 y ago

1) this is expected, typically lens correction (like shading) info written by manufacturers is very crude in the first place - they supply info for 3-4-5 regions for EV correction instead of 30-40-50 to make it very smooth and Adobe probably does not interpolate nicely

AND also somewhat related (not about shading but about geometry)

2) geometry (barrel/pincussion/moustache/etc and LaCA /lateral/ - which is actually a geometry correction for 3 separate color planes) optics correction always bands the noise - see comments from Eric Chan back in 2011 - https://forums.adobe.com/thread/798576

Champion

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2.4K Messages

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39K Points

3 y ago

Most of the moire pattern you are seeing is due to the display resizing interpolation used for <1:1 Zoom views (i.e. Fit), which appears to be "nearest neighbor." The LR Classic Develop module also uses nearest neighbor, but the Library module uses the more accurate bicubic interpolation when creating preview files. It appears LR CC 2.1.1 uses nearest neighbor interpolation for all of it's previews, so the only way to see the "actual" image rendering is to use 'Save To' JPEG.

Here's what a similar "noisy" image file looks like inside LR Classic 8.1 Develop and Library modules with Lens Profile applied. The Library preview shows very little moire' and an image file with proper noise reduction applied will exhibit even less moire' pattern.

Canon 5D MKII CR2 file, ISO 3200, 1 sec., with lens cap on, +5.0 LR Exposure setting and no Noise Reduction applied.