I wanted to start scanning my old albums of pictures I have from before the digital age and stumble upon a problem that appears in all my scan, and multiple times per scan at regular interval (see attachement).
I get this kind of misalignement of pixels which, depending on the texture, can be quite jarring. Those "lines", once you have spot one, you can see it running on all the vertical axis of the scan. Also, those are found at regular interval 1300 pixels or so (at 1200 dpi).
That hints at a resampling issue (downsampling).