Preview not saving edited photos (JPEGs) on MacBook running OSX 14.0 (Sonoma)

I upgraded to 14.3 2 days ago, and my problems (color only, I haven't really used greyscale - however the problems I was experiencing were the SAME) - 14.3 seems to have solved the problem and it's apparently an important security update.

For me, upgrading from 14.1 to 14.2.1 did not help. Same problem. But the other obscure workaround mentioned above does work for me. After making the edits to the JPG, I exported to PDF, which worked fine, and then exported the PDF back to JPG, which also worked fine.

Weird one. Seems like a bug in the latest release to me. Any chance that Apple might take a look at this one?

Having the same problem. Here is a workaround that solved it for me:

Open up the ColorSync Utility (/Applications/Utilities). Open the image file you want to edit. At bottom left, there'll be dropdowns for "Match to Profile" and "None." Click the "None" one and select Display —> Apple RGB (or some other RGB). Save the image file in ColorSync Utility.

Now open up the saved file with Preview. You should be be able to save it as normal.

hope this helps!

Best

I FOUND A WORK-AROUND!!

I'm having the same problem with greyscale images. I scanned three photos, two are greyscale and one was color. The color photo I was able to edit in Preview and save, with no problem. The two photos I scanned as greyscale would not "save" nor "autosave." I opened Security settings and gave Preview full access, but that didn't fix the problem. So I opened the greyscale jpeg, saved it as a PDF, and then saved the PDF as a jpeg. It fixed the problem with that image! Now all we need is a global fix.

Updating to 14.2.1 resolved the issue. Thanks!

Exporting saved photo as a PDF, then back as a jpeg, This option worked, but, it's not an ideal workaround. Apple could not help on this first attempt other than suggesting that I have the latest version, which I do, and then reloading operational software, they didn't even seem to know this was an issue, Not doing that just yet. Like everyone else replying, I noticed this started on recent software updates beginning with 14.2 I believe.

I upgraded to 14.3 2 days ago, and my problems (color only, I haven't really used greyscale - however the problems I was experiencing were the SAME) - 14.3 seems to have solved the problem and it's apparently an important security update.

This seems to be a similar problem I experienced with GraphicConverter a while ago:

GraphicConverter version 12.0.3 browser did not display a grayscale .jpg with ICC_Profile:ProfileDescription:Dot Gain 20%. The Browser's Exif information fields were also blank. The latest Photoshop inserts ICC Dot Gain 20% to its grayscale images. Deleting or changing such ICC corrected the issue. This was fixed in later GraphicConverter.

And sure enough: macOS 14.3.1 Preview.app can not edit and exported such grayscale image as .jpg ("could not be exported as a.jpg").

One workaround would be GraphicConverter > Picture > Colors > Change to TrueColor. Then also Preview.app and edit and export that as .jpg.

GraphicConverter 12.0.8 can edit and save such images so I'd recommend that as a better workaround.

I updated to 14.4.0 - and this seems to have solved the problem

An obtuse workaround is to make the edits to the jpg, export the file to a PDF, then open the PDF with Preview and export it back to a JPEG format file.

The current version is 14.2.1, you may try updating.

Does it work if you save in a different format like png?

Does it work if you try it in a new user account?

I updated to 14.4.1 and Preview now works as it should with B/W or greyscale images

Does it make any difference if the files are in another location, like your Desktop or Pictures folders?

Does it do the same thing:

a) while booted in Safe Mode?

b) while booted normally and logged in to a new user account?

How about shutting down your Mac and rebooting it?