Preview.app is corrupting my images when I rotate them. Does anyone know why this might be? I've had issues with corrupt quicklook previews, but not this.

Before: picture before rotating

After opening in Preview.app and rotating counter-clockwise once, then saving:

corrupted picture after rotating in Preview.app

Simultaneously, I also suffered the issues described here, but I resolved that by clearing the caches as described.

Disk Utility reports my file system is healthy. I'm using a home-made fusion drive combining a 250 GB SSD and 750 GB HDD, not sure if that's relevant. Also, I don't think my memory is corrupt as I have no problems with system stability otherwise.

I tried some other pictures, some were garbled, some weren't:

This image rotated OK (only rotated shown): Rotated image remote control

This image got garbled and mixed in parts of the previous image:

Original: sample 2 original image

Rotated: Sample 2 rotated image

  • Please edit your question and/or add tags to specify the version of macOS on your machine. Is this happening with any file type you're working with (JPEG, GIF, PDF, PNG) or one specific file type? I don't think the HD format, (homegrown or otherwise,) has any bearing on this problem.
    – IconDaemon
    Oct 22, 2017 at 16:01
  • So it only happens after you save it?
    – Natsfan
    Oct 22, 2017 at 17:33
  • @IconDaemon 1) I have yosemite, so I tagged my question with 'yosemite'. Are there other applicable tags I missed? 2) Some JPEG files have this, others don't. I do think it's related to memory as images are mingled after rotating (see new examples)
    – Tim
    Oct 28, 2017 at 18:39
  • @jmh Yes, the image looks OK in Preview, then when I save it it appears garbled in Quicklook, and when I re-open with Preview it's still garbled.
    – Tim
    Oct 28, 2017 at 18:41
  • I just tried rotating a single page in a large PDF. I saved as a new file name. When I open the new file it looks fine. I'm baffled.
    – Natsfan
    Oct 28, 2017 at 18:50


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