What is ImageJ?
ImageJ is an open source image processing program for multidimensional image data with a focus on scientific imaging.
What is Fiji?
Fiji Is Just ImageJ—a "batteries-included" distribution of ImageJ which includes many useful plugins contributed by the community.
What does ImageJ provide?
|| A user interface with functions to load, display, and save images.
|| Image processing, colocalization, deconvolution, registration, segmentation, tracking, visualization and much more.
|| An extension mechanism including support for macros and scripts.
|| A vibrant, diverse, and helpful user community that gives rise to insightful scientific exchanges.
ImageJ's extensibility is the root of its effectiveness: many advanced image-processing methods are not provided by the core application, but rather are plugins written by specialists in specific fields, made available via update sites.
How do I get started?