I recently reinstalled macOS Sierra, due to my annoying Bluetooth issues. I hadn't noticed any side effects of the reinstall until I went to save a JPEG image from Acorn.
On save, I noticed that the image's extension was .jpeg rather than what I thought was the usual .jpg. As both of my other Macs save with the .jpg extension, I figured something was messed up on the iMac. So I (of course) tweeted about the issue. A while later, Shawn King replied with this seemingly odd suggestion:
Get an answer? Does this work? “defaults write https://t.co/jKWyyz4boo.screencapture type jpg;killall SystemUIServer” (it did for me)
— Shawn King (@ShawnKing) March 19, 2017
So I tried it, and sure enough, changing the screen capture file format via defaults write com.apple.screencapture type jpg and then restarting the SystemUIServer with killall SystemUIServer changed my default JPEG extension in every app to .jpg.
What's really strange is that I then switched the screenshot format back to png, and the .jpg extension remained. I even went so far as to delete the pref (defaults delete com.apple.screencapture), and still, the extension remains .jpg. So whatever change occurred when switching the default screenshot format, it appears to be permanent.
I tried the same trick for the .tiff extension (which I rarely use, so it doesn't bother me as much), and it sort of worked: Captured screenshots got a .tif extension, but images saved from apps still got the four-letter .tiff extension. Weird.
If anyone knows exactly what's going on with the .jpeg vs. .jpg extension, I'd love to hear the explanation.
The bug is also apparent when emailing or air dropping one image and has been around for some time. If you send more than one image the extensions are all .jpg
any way to convert that to English for us non= tech folks having trouble with computer turning edited pics into fullsizeoutput jpegs
This technique does not seem to work under Catalina version 10.15.3.
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