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Make ImageJ GUI work on macOS #23

ctrueden opened this issue Jan 7, 2019 · 2 comments

Make ImageJ GUI work on macOS #23

ctrueden opened this issue Jan 7, 2019 · 2 comments


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@ctrueden ctrueden commented Jan 7, 2019

When launching ImageJ with a display from Python on macOS, it hangs. See 68dad62 for the current workaround and links to more information. The pyimagej code should try to be clever and start the Cocoa event loop itself before spinning up Java.

See also


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@oeway oeway commented Oct 26, 2019

Same issue here, the script hangs when headless=False. I get the GUI by following the suggestions in #39, but without the FIJI menu (instead, it shows only a single menu item named python).

  1. run conda active pyimagej
  2. run pip install pyobjc
  3. download
  4. write a test script named with the following content:
import time
import imagej

ij = imagej.init('/Applications/', headless=False)

while True:
  1. run python and I got GUI work:

Screen Shot 2019-10-26 at 8 05 07 PM

However, the fiji menu didn't show as expected, any idea? @ctrueden


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@ctrueden ctrueden commented Oct 30, 2019

@oeway Hmm. I guess that since Java is started inside the Python process, the usual macOS menu bar logic does not work?

I don't immediately know how to fix it. But one quick workaround is to use:

ij = imagej.init('/Applications/', headless=False)

This will pop up the Swing UI instead of the legacy ImageJ1 UI. In my quick experimentation, major things including legacy IJ1 plugins do still work—although you may encounter rough edges in some cases.

Relatedly: I am exploring integrating the OSXAWTWrapper logic directly into pyimagej so that you don't have to do so many extra steps manually.

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