These comments apply to upgrading from previous working installations of AstroImageJ to version 2.0. With this upgrade, all preference settings will be reset to the default values on all platforms, and memory settings will need to be reconfigured for Windows and Mac. This will not be required for future updates. This change was made to allow AstroImageJ to work independently of basic ImageJ for users with both versions installed. The old settings can be propagated forward by users that are comfortable with copying files from one location to another as noted below for each platform. Linux ===== Preferences can be propagated forward by copying the hidden file cp $HOME/.image/IJ_Prefs.txt $HOME/.astroimage/AIJ_Prefs.txt Windows ======= Preferences can be propagated forward by copying the hidden file HOME/.image/IJ_Prefs.txt to HOME/.astroimage/AIJ_Prefs.txt To propagate memory and java virtual machine settings forward, copy the ImageJ.cfg file from your old installation directory to AstroImageJ.cfg in your new installation directory. As with previous versions of AstroImageJ and ImageJ running under windows, if 64-bit operation is desired, the AstroImageJ.exe launcher will always configure AstroImageJ with 32-bit java rather than 64-bit, if 32-bit java is installed on the system. The first time it is started, AstroImageJ.exe creates a file named AstroImageJ.cfg in the installation directory that contains these settings. To enable 64-bit operation when both 32-bit and 64-bit Java are installed, edit the AstroImageJ.cfg file that has been created to point to the 64-bit java installation. As an example, if 32-bit java is installed at C:\Program Files (x86)\Java\jre7\bin\javaw.exe and 64-bit java is installed at C:\Program Files\Java\jre7\bin\javaw.exe, modify the AstroImageJ.cfg file as shown below (in this typical configuartion, the only change needed is to remove the characters " (x86)" from the second line): Example 32-bit AstroImageJ.cfg file: ------------------------------------ . C:\Program Files (x86)\Java\jre7\bin\javaw.exe -Xmx640m -cp ij.jar ij.ImageJ Example 64-bit AstroImageJ.cfg file: ------------------------------------ . C:\Program Files\Java\jre7\bin\javaw.exe -Xmx640m -cp ij.jar ij.ImageJ Mac === Preferences can be propagated forward by renaming the file $HOME/Library/Preferences/IJ_Prefs.txt to AIJ_Prefs.txt Memory settings on the Mac will need to be reconfigured.