I have an iPhone 13 Pro and I take thousands of photos with it. Most of them are just fine, but I have a couple that are resampled beyond usability that I cannot understand.
For example the attached photo is one of a series of four photos all shot of the same subject. It is the same dimensions as the others and I didn't change any settings, but it is clearly resampled horribly.
What is the cause and how can I prevent it from happening in the future?
For comparison, here is one that was processed normally.
Blow-up screenshot of first image, to make it easier to see on a smaller device…