1

In macOS 10.15.7 Catalina, some images are displayed with green stripes in the thumbnail in Finder and Quick Preview (press Spacebar). However, the image displays correctly when opening in various photo apps like Preview app, Photoshop.

To solve the problem, I have to re-save the JPEG with max quality in the Preview app. Save in the default quality (70% I guess?) won't have any effects at all.

My question is: How to identify these JPEGs (either programmatically / using some software)? When I use jpeginfo (installed via Homebrew) to check the JPEG, it shows it's OKAY.

jpeginfo --info --check ./error.jpg 
./error.jpg 3841 x 2881 24bit Exif  Normal Huffman 1068217  [OK]

UPDATE According to the Internet, the tool jpeginfo is outdated, and cannot diagnose JPEG errors well, as it only checks some key points in the metadata. Now trying other tools...

The problematic image:

The original image

In Finder:

in Finder

Quick Preview:

Quick preview

Improve this question
4
  • See if rebuilding the thumbnails fixes it - try apple.stackexchange.com/questions/150799/…
    – Tetsujin
    Jun 15, 2021 at 8:21
  • Thanks, but this only appears in certain images, not all. Also, I tried the method in the quoted question, didn't help. Apparently, it's caused by the metadata of the JPEG.
    – Raptor
    Jun 16, 2021 at 1:51
  • Do you tried to render the files new? `sips --setProperty jpeg input.jpg --out output.jpg˚
    – womenlover
    Jun 16, 2021 at 6:27
  • Tried the command, no output file is generated. Tried the --debug and --verify flag, still the same. For the --repair flag, it generated: Error: Cannot do --repair on file and Error 13: an unknown error occurred
    – Raptor
    Jun 21, 2021 at 2:16

1 Answer 1

Reset to default
0

This is a bug that exists in macOS 10.15, and is now fixed in macOS 12 Monterey.

Improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .