Q: Lines on imported photos

I have one (last?) experience to add to this ongoing problem.  I've transferred a number of edited .jpgs to my iPad today.  Within my "transferring app" (a network file viewer) the images displayed correctly.

If I texted/iMessaged an image, or posted one to Facebook, without ever opening it up in the Photos app, it remained ok.  If I used an image after first viewing it in Photos, it became corrupted with the lines.  Images I successfully texted/iMessaged/posted immediately became corrupted the first time I viewed them in Photos.

I'm fairly convinced it's the Photos app that's at the root of the problem.

I think you are right - seems to do with Photos

Don't know for sure if Apple folks are reading this stuff but based on the details presented in this chain of comments, they should be able to zero in on the problem source.

One other factor I have noticed is that when you "enlarge" a photo with the lines (two-finger spread of the image) the lines disappear! but then reappear when you return the photo to normal display size.....but still no clue as to why some photos have this problem and others don't!

I have exactly the same problem. I am on holiday and having imported via the SD Card Camera Reader onto my iPad Air (1st generation of the Air) I was alarmed to observe these lines. I then tried importing onto my iPad Mini (1st generation of the Retina display MinI). Same problem. Thankfully I found your posting and read all the responders. Otherwise I might have reformatted my SD card thinking that was the problem. While if you double tap or enlarge the image in Photos the lines disappear, they reappear if you edit the image in any way. They also appear in other editing apps like Photogene and Lightroom. They do not appear in Snapseed as has been reported by a respondent already. I wonder if this is a problem on more recent iPads like the iPad Pro which I will have to wait and see when I return home. But as things stand this is a pitiful experience rendering the iPad an unsatisfactory mobile device for photography. There must be a lot of disappointed iPad users out there. If I were one of Apple's competitors I would watch for these shortcomings and capitalise on them. I could be tempted for something more reliable. I don't appreciate such negative surprises especially while I am on holiday. Wake up and smell the coffee, Apple!

Sorry you're having the problem, too!  Yes, enlarging the image in Photos makes the lines disappear temporarily.  The image is less compressed and the artifacts disappear, which seems to support the .jpg compression-issue theory.  The lines return when you exit the image and view it again.

[sarcasm alert]

For the record, I may have found a solution - I purchased a new iPad Air 2 a couple of weeks ago and haven't seen the problem at all on the new device.  It's running the latest iOS, 9.3.4.  This "fix" only costs $499...

[end sarcasm alert]