Strange pattern

Started 6 months ago | Questions thread
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ggc New Member • Posts: 6
Strange pattern

Hello everyone,

recently i took come pictures with my Powershot A640.

Most of them were fine, but on a pair of them i have some strange pattern on the right side of the image.

These are 100% crops from unprocessed raw (with CHDK and converted with DCRAW).

What could it be? Better seen at 100%.

Next shots were ok.

Thank you in advance.

You can find the full image here: https://we.tl/QFfCLeqP1n

I posted some crops here on dpreview, but they were so compressed  that the problem was invisible.

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Canon PowerShot A640
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