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Missing QuickLook thumbnail for supported (Canon R Series) camera RAW file type (Sequoia)

Is anyone else experiencing this issue ...

Canon's RAW file formats have been supported by macOS for a number of releases (see Digital camera RAW formats supported by iOS 18, iPadOS 18, macOS Sequoia, and visionOS 2 - Apple Support (CA)). After upgrading directly to Sequoia 15.1, I noticed that the QuickLook thumbnail was missing for such files:

It should look somewhat like the following example (which uses a custom Finder icon for the thumbnail in place of the QuickLook thumbnail).

Is this a likely oversight in Sequoia or could it be the result of Canon not providing a timely update that conforms to Sequoia's QuickLook app extension API for thumbnail generation?

- Pie Lover

Mac mini (M2, 2023)

Posted on Nov 4, 2024 7:19 AM

Top-ranking reply

BlueberryLover Author

Level 4

1,247 points

Posted on Nov 24, 2024 2:48 AM

You can simply logout and back in or use the Activity Monitor to force quit the ImageThumbnailExtension process. For the time being, try zipping your CR3 (and possibly other types of RAW images) to prevent thumbnail generation for those images formats.

The problem with moving and deleting files is caused by the excessive CPU used when the ImageThumbnailExtension presumably executes in a tight, endless loop. The root cause may be that CR3 image shot with the HDR PQ option have embedded HEVC encoded previews (rather than JPEG). Turning off the HDR PQ option should allow the thumbnail generation to work normally (since thumbnails are likely generated from the embedded preview).

I reported the issue to Apple Support so, with any luck, it should be fixed in a future maintenance update.

- Pie Lover

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24 replies

dialabrain

Level 10

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Nov 4, 2024 7:47 AM in response to VikingOSX

Hence, my posting the list. :)

BlueberryLover Author

Level 4

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Nov 4, 2024 7:55 AM in response to dialabrain

Thanks for the replies. I experienced the problem with the CR3 RAW file format used by the EOS RP and EOS R5. Both cameras have been supported by macOS for some time.

- Pie Lover

dialabrain

Level 10

135,635 points

Nov 4, 2024 8:01 AM in response to BlueberryLover

an R5 & RP file… works for me.

BlueberryLover Author

Level 4

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Nov 4, 2024 8:07 AM in response to dialabrain

Thanks that's very interesting. I wonder what's different in my environment. I'll try copying a test CR3 file to another user account on the same machine.

- Pie Lover

VikingOSX

Level 10

123,182 points

Nov 4, 2024 8:19 AM in response to dialabrain

dialabrain wrote:

Hence, my posting the list. :)

Which the OP had posted before you… 🤨

BlueberryLover Author

Level 4

1,247 points

Nov 4, 2024 8:23 AM in response to BlueberryLover

I copied a test CR3 (R5) file (via macOS Drop Box) to a different user account on the same machine. The thumbnail image is still not visible in Finder.

- Pie Lover

dialabrain

Level 10

135,635 points

Nov 4, 2024 8:41 AM in response to VikingOSX

However, the R5 mark II is not listed as supported.

VikingOSX

Level 10

123,182 points

Nov 4, 2024 11:16 AM in response to dialabrain

I posted this in case the OP mentioned R5 and had an R5 II… Sure, I knew it was not supported…

dialabrain

Level 10

135,635 points

Nov 7, 2024 6:13 AM in response to BlueberryLover

BlueberryLover wrote:

Thanks for that. Actually it was my post on the exiftool forum. :-)

I, for one, knew that. 😎

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Missing QuickLook thumbnail for supported (Canon R Series) camera RAW file type (Sequoia)