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I use 4 first, then I paste it into Mail, when I double click the image that I pasted, it is TIFF format.

I try to change the screenshot format to png, it works. But when I change back to jpg or bmp, both of them will be saved as TIFF format.

defaults write com.apple.screencapture type jpg

How can I save it as jpg format?

  • Why do you want jpg? To save space? Compatibility? – Harcker Jan 21 '18 at 9:24
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    Because some of my clients don't know to how to open TIFF format image. – Michael Jaq Jan 21 '18 at 15:32
  • Did you use killall SystemUIServer directly after the defaults command? What version of OS X/macOS are you using? – user3439894 Jan 21 '18 at 15:45
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    same issue as OP. All screenshots save as JPG, except when I prepend CTRL to save screenshot to clipboard. Seems like a bug. Windows people then can't easily open TIFF for some reason – Paul Jan 26 '19 at 19:27
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If you download TinkerTool you can change the default for screenshot to jpeg. When jpeg's are sent as attachments they remain jpegs. TinkerTool can be found here. It allows you to change many Apple defaults to other options. After opening TinkerTool click on the general tab to change default screen capture.

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  • Tinkertool just sets defaults - How does this differ from what the OP said in the question? – user151019 Jan 21 '18 at 19:05
  • Last statement read 'How can I save it as jpg format?' And it solves email issue. – jmh Jan 21 '18 at 19:07
  • TiinkerTool does not have any effect on the reported problem. CMD-SHIFT-4 produces the setting that's in com.apple.screencapture.plist file. Unfortunately, CNTRL-CMD-SHIFT-4 pasted into an email still produces a TIFF format. I agree with Paul … seems like it's a bug. – Carl Jan 30 at 22:58

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