recently i took come pictures with my (old) 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. I remember this happened few times also in 2012 or so.
You can find raw (with CHDK and converted with DCRAW) and jpeg file on this link on wetransfer:
It might be because there is a slight difference between alternating lines of green pixels on this camera. I think Raw Therapee has green equalisation to address that issue.
