This problem can arise when 12-bit, 14-bit or 16-bit images are loaded into ImageJ without autoscaling. Common issues The image I loaded is displayed all black! But it is not black! If you are technically savvy, check out the Debugging page for additional-but more complicated-debugging techniques. After doing that, you will probably see some information printed to the console, which you can paste online to somewhere like, and write to the Community to ask for help deciphering it. If you are feeling investigative, you can try launching ImageJ from the console to get more information about why it is failing to start up. The easiest workaround is to download a fresh copy of the software. While the developers of ImageJ make a serious effort to prevent this problem from happening, it is still possible after running the Help › Update… command, due to bugs in the Updater. If the ImageJ window never appears after launching the program, the installation may be corrupted. You can replace the 512m with however many megabytes of memory you wish to give to ImageJ. Note that by default, Windows hides file extensions you may need to show file extensions before you can successfully name the file ImageJ.cfg as required.Save the file as ImageJ.cfg in your ImageJ2.app (or Fiji.app) installation.If you launch ImageJ in debug mode (see above), and receive a message like:Ĭould not reserve enough space for 1253376KB object heap On some 32-bit Windows systems, ImageJ may initially request more memory than Windows can handle. If ImageJ does not start up On a fresh installation Take note of any error messages in the console window, which you can copy and paste it into a bug report.Perform the same actions which previously resulted in the crash.Launch ImageJ from the console as described above.If ImageJ crashes-i.e., the program suddenly terminates, with or without an error message-it is very helpful to identify the steps which can reliably reproduce the crash: you can paste it into a bug report! If ImageJ crashes Press ↵ Enter to copy it to the clipboard.Click the Command Prompt icon in the upper left corner of the window, and choose Edit › Mark. ( Note: this shortcut actually uses the Break key) Press ⌃ Ctrl + Pause in the Command Prompt window to print the stack trace.Right click and select “Copy” to copy it to the clipboard.Select the stack trace by dragging with the left mouse button.Press ⌃ Ctrl + \ in the console window to print the stack trace.On Windows, you will need to download and run this batch file, which launches ImageJ with an attached Command Prompt window.Launch ImageJ again, this time from the console as described above.If the first method does not work, and you can reproduce the hang: Press ⌃ Ctrl + A to select it, then ⌃ Ctrl + C to copy it to the clipboard.If successful, it will open a new window with the stack trace. There are two ways to create such a snapshot, known as a “thread dump” or “stack trace”. This information can give the developers valuable hints about how to fix the problem. If ImageJ appears to hang-i.e., it stops responding to inputs-it is often helpful to take a “snapshot” of where the program is at after the hang occurs. For maximum debugitude, turn on both! If ImageJ freezes or hangs This might reveal different information than using the techniques described above. There is another debug mode, which can be enabled in the Edit › Options › Misc… menu, by checking Debug mode. See the Logging page for more about SciJava logging. Valid levels include: none, error, warn, info, debug and trace. You can control the log level more precisely by setting the system property.
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