ImageJ 1.48

This is the full release of ImageJ 1.48. Use the Help>Update ImageJ command to upgrade to the latest version (e.g., 1.49e). Documentation (including the 188 page User Guide), Java source code, plugins, macros and scripts are available on the ImageJ website at imagej.nih.gov/ij/.

Contents of ImageJ folder:

ij.jar
This JAR (Java Archive) file is the platform-independent core of ImageJ. It is the only file changed when you upgrade using the Help>Update ImageJ command.
ImageJ.app
This is a 32-bit ImageJ launcher for Mac OS X. It assumes that ij.jar is in the ImageJ folder.
ImageJ64.app
This is a 64-bit ImageJ launcher for Mac OS X. It assumes that ij.jar is in the ImageJ folder.
ImageJ.exe
This is the ImageJ launcher for Windows.
run
This is a shell script that runs ImageJ.
macros
This folder contains example macros. The StartupMacros.txt file in this folder contains macros and macro tools that are automatically installed when ImageJ launches. To run a macro, drag and drop it on the ImageJ window and run it by pressing ctrl-r (Macros>Run Macro).
plugins
This folder contains a small sample of the hundreds of plugins available for ImageJ. The plugins in this folder are installed in the Plugins menu when ImageJ starts.
luts
This folder contains LUTs (LookUp Tables) that are installed at startup in the Image>Lookup Tables menu. Use the Image>Color>Display LUTs command to view all the LUTs in this menu.