The default VM is -client, unless you’re on 64-bit (it only has -server). Generally you get the best performance out of this setting. -server turns on the optimizing JIT along with a few other “server-class” settings.Most runs will want to tweak a few simple flags: These examples are gleaned from Headius’ blog: The basics In the last example, Ant gets to see the option -help, which ImageJ would have interpreted itself if it were passed before the double dash. In the presence of a double-dash, ImageJ options have to go before the - (this is to allow passing options to the Java program that would be mistaken for ImageJ options otherwise).If you have a - in your command line, the arguments for ImageJ go after the double-dash.If you do not specify any Java options, you do not need a - at all.It can be confusing to pass ImageJ and Java options at the same time as command line options to ImageJ (or other programs). (or: how to separate Java options and ImageJ options from command line options) Note that this differs from an older legacy format and that the first “# ImageJ startup properties” comment line is required. In recent versions of the launcher, this is ignored. legacy.mode Deprecated option to disable use of the legacy ImageJ.cfg.jvmargs Arguments passed to the Java Virtual machine.maxheap.mb The integer value is passed as a -Xmx option to the JVM set the maximum heap size.Jvmargs = -XX:+HeapDumpOnOutOfMemoryError -Xincgc By passing the parameters to the ImageJ launcher, separated by - from the ImageJ options.Sometimes, you have to help it, by providing some Java options to ImageJ. Therefore, we rely on the Java virtual machine to do a good job for us. Then replace the launcher with the new one, keeping a backup of the previous launcher in case the new one does not work. For macOS and Linux binaries, set the executable bit using chmod +x. If you want to test the latest UNSTABLE version, it can downloaded here:Īfter download, rename to match the filename given above. The launcher comes with ImageJ, ImageJ2 and Fiji. ImageJ-run System_Clipboard (the underscore was used in place of a space to avoid having to quote the argument) Start ImageJ and run a menu entry directly.Link ImageJ into the PATH: ln -s $(pwd)/ImageJ- $HOME/bin/fiji & fiji.to the classpath and execute the given class’ main() method. ImageJ-server - (everything that comes before a - is interpreted as Java option) Show the java command line instead of running ImageJ.But beware: this might fail since some plugins need at least Java 1.5, and the 3D viewer needs Java3D. Run ImageJ with the system Java instead of its own one.ImageJ-jython (the classpath will be the same as when calling ImageJ), and likewise -jruby, -bsh and -js for the respective language’s command-line interpreters rb extension, for Beanshell scripts with. ImageJ- example.py (also works for JRuby scripts when they have an. Control the Updater from the command line.Run macros and scripts in headless mode.Launch ImageJ with a different amount of memory ( -mem option).The launcher can do all kinds of things, like:
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