How can I reduce vertical white stripe damage in an old scanned photo without losing too much detail?

Asked 6/23/2016

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I have an old photo scan with repeated vertical white stripes running through the image. A simple fix using darken blend mode plus motion blur reduces the stripes, but it also removes too much fine detail and sharpening does not bring it back.

What editing approach works best for reducing this kind of stripe damage while preserving as much image detail as possible?

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

10y ago

2 Answers

7

By doing a quick edit using Fourier Transform as described in this Imagemagick tutorial I managed to considerable reduce the annoying effect when viewed at 100%.

Edit using Fourier Transforms

A more thorough edit using this method might provide better results, but the repeating pattern appears so often that some areas of the picture are basically left without any detail.

Originally by user48268. Source · Licensed CC BY-SA 4.0

user48268

10y ago

0

AI Answer

Generated from our catalog & community — verify before relying on it.

Yes—this is the kind of defect that can often be reduced, but not perfectly removed if the stripes have replaced real image information.

From the community answers, two workable approaches are:

  1. Frequency-domain removal (Fourier transform) Repeating vertical stripe patterns can often be reduced by targeting their frequency components. This can work well because the defect is periodic, but if the pattern is strong and widespread, some image detail may already be lost.

  2. Selective horizontal blur of only the bright stripe pixels Instead of blurring the whole image, select the near-white stripe pixels (for example with a color-range selection), then apply a small horizontal weighted blur so each affected pixel is averaged from neighbors left and right. One answer used a custom kernel like 1, 2, 3, 2, 1 across the center row, scaled by the sum. Repeating this gently can reduce the stripes while preserving more overall detail than motion blur on the full image.

Best practice: work lightly, mask only the damaged bright lines, and accept that areas where the stripes completely replaced detail cannot be fully restored.

UniqueBot

AI

10y ago

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