All Classes

Class	Description
AboutBox	This plugin implements the Help/About ImageJ command by opening about.jpg in ij.jar, scaling it 600% and adding text to an overlay.
Analyzer	This plugin implements ImageJ's Analyze/Measure and Analyze/Set Measurements commands.
Animator	This plugin animates stacks.
AppearanceOptions	This plugin implements the Edit/Options/Appearance command.
ArrayUtil
Arrow	This is an Roi subclass for creating and displaying arrows.
ArrowTool
ArrowToolOptions	This plugin implements the Edit/Options/Arrow Tool command.
AutoThresholder	Autothresholding methods (limited to 256 bin histograms) from the Auto_Threshold plugin (http://fiji.sc/Auto_Threshold) by G.Landini at bham dot ac dot uk).
AutoThresholder.Method
AVI_Reader	ImageJ Plugin for reading an AVI file into an image stack (one slice per video frame) Restrictions and Notes: - Only few formats supported: - uncompressed 8 bit with palette (=LUT) - uncompressed 8 & 16 bit grayscale - uncompressed 24 & 32 bit RGB (alpha channel ignored) - uncompressed 32 bit AYUV (alpha channel ignored) - various YUV 4:2:2 and 4:2:0 compressed formats (i.e., formats with full luminance resolution, but reduced chroma resolution - png or jpeg-encoded individual frames.
AVI_Writer	This plugin implements the File/Save As/AVI command.
BackgroundSubtracter	Implements ImageJ's Subtract Background command.
BatchConverter	This plugin implements the File/ /Convert command, which converts the images in a folder to a specified format.
BatchMeasure	This plugin implements the File/Batch/Measure command, which measures all the images in a user-specified folder.
BatchProcessor	This plugin implements the File/Batch/Macro and File/Batch/Virtual Stack commands.
Benchmark	Implements the Plugins/Utilities/Run Benchmark command.
Binary	Implements the Erode, Dilate, Open, Close, Outline, Skeletonize and Fill Holes commands in the Process/Binary submenu.
BinaryInterpolator
BinaryProcessor	This class processes binary images.
Binner	This plugin implements the Image/Transform/Bin command.
BitBuffer	A class for reading arbitrary numbers of bits from a byte array.
Blitter	ImageJ bit blitting classes must implement this interface.
BMP_Reader	This plugin reads BMP files.
BMP_Writer	Implements the File/Save As/BMP command.
BrowserLauncher	This plugin implements the File/Import/URL command and the commands in the Help menu that open web pages.
BrushTool	This class implements the Paintbrush Tool, which allows the user to draw on an image, or on an Overlay if "Paint on overlay" is enabled.
ByteBlitter	This class does bit blitting of byte images.
ByteProcessor	This is an 8-bit image and methods that operate on that image.
ByteStatistics	8-bit image statistics, including histogram.
Calibration	Calibration objects contain an image's spatial and density calibration data.
CalibrationBar	This plugin implements the Analyze/Tools/Calibration Bar command.
Calibrator	Implements the Analyze/Calibrate command.
CanvasResizer	This plugin implements the Image/Adjust/Canvas Size command.
ChannelArranger	This plugin implements the Image/Colors/Arrange Channels command, which allows the user to change the order of channels.
Channels	Displays the ImageJ Channels window.
ChannelSplitter	This plugin implements the Image/Color/Split Channels command.
CircularRoiMaker	This class implements the Process/FFT/Make Circular Selection command.
ClassChecker	Checks for duplicate class and JAR files in the plugins folders and deletes older duplicates.
Clipboard	Copies/pastes images to/from the system clipboard.
ColorBlitter	This class does bit blitting of RGB images.
ColorChooser	Displays a dialog that allows the user to select a color using three sliders.
ColorPicker	Implements the Image/Color/Color Picker command.
ColorProcessor	This is an 32-bit RGB image and methods that operate on that image..
Colors	This plugin implements most of the Edit/Options/Colors command.
ColorSpaceConverter	ColorSpaceConverter
ColorStatistics	RGB image statistics, including histogram.
ColorThresholder	Selects pixels according to hsb or rgb components.
CommandFinder
CommandListener	Plugins that implement this interface are notified when ImageJ is about to run a menu command.
CommandLister	This class is used by the Plugins/Shortcuts/List Shortcuts command to display a list keyboard shortcuts.
Commands	Runs miscellaneous File and Window menu commands.
Commands	This plugin implements the Plugins>Utiltiees>Recent Commands command.
Compiler	Compiles and runs plugins using the javac compiler.
CompositeConverter	This plugin implements the Image/Color/Make Composite command.
CompositeImage
Concatenator	This plugin, which concatenates two or more images or stacks, implements the Image/Stacks/Tools/Concatenate command.
ContrastAdjuster	This plugin implements the Brightness/Contrast, Window/level and Color Balance commands, all in the Image/Adjust sub-menu.
ContrastEnhancer	Implements ImageJ's Process/Enhance Contrast command.
ControlPanel	ControlPanel.
Converter	Implements the conversion commands in the Image/Type submenu.
Convolver	This plugin convolves images using user user defined kernels.
Coordinates	The plugin implements the Image/Adjust/Coordinates command.
CurveFitter	Curve fitting class based on the Simplex method in the Minimizer class Notes on fitting polynomial functions: (i) The range of x values should not be too far from 0, especially for higher-order polynomials.
Debugger
DialogListener	PlugIns or PlugInFilters that want to listen to changes in a GenericDialog without adding listeners for each dialog field should implementthis method.
DICOM	This plugin decodes DICOM files.
DicomTools	DICOM utilities
DirectoryChooser	This class displays a dialog box that allows the user can select a directory.
Distribution	This plugin implements the Analyze/Distribution command.
DownsizeTable	A table for easier downsizing by convolution with a kernel.
DragAndDrop	This class opens images, roi's, luts and text files dragged and dropped on the "ImageJ" window.
Duplicater	Deprecated. replaced by Duplicator class
Duplicator	This plugin implements the Image/Duplicate command.
Editor	This is a simple TextArea based editor for editing and compiling plugins.
EDM	This plugin implements the Euclidean Distance Map (EDM), Watershed, Ultimate Eroded Points and Voronoi commands in the Process/Binary submenu.
EllipseFitter	This class fits an ellipse to an ROI.
EllipseRoi	This class implements the ellipse selection tool.
EventListener	This plugin implements the Plugins/Utilities/Monitor Events command.
Executer	Runs ImageJ menu commands in a separate thread.
ExtendedPlugInFilter	ImageJ plugins that process an image may implement this interface.
ExtensionDescriptor
FFT	This class implements the FFT, Inverse FFT and Redisplay Power Spectrum commands in the Process/FFT submenu.
FFTCustomFilter	This class implements the Process/FFT/Custom Filter command.
FFTFilter	This class implements the Process/FFT/Bandpass Filter command.
FFTMath	The class implements the Process/FFT/Math command.
FHT	This class contains a Java implementation of the Fast Hartley Transform.
FileInfo	This class consists of public fields that describe an image file.
FileInfoVirtualStack	This plugin opens a multi-page TIFF file, or a set of raw images, as a virtual stack.
FileOpener	Opens or reverts an image specified by a FileInfo object.
FileSaver	Saves images in tiff, gif, jpeg, raw, zip and text format.
Filler	This plugin implements ImageJ's Fill, Clear, Clear Outside and Draw commands.
Filters	This plugin implements the Invert, Smooth, Sharpen, Find Edges, and Add Noise commands.
Filters3D
FITS_Reader	Opens and displays FITS images.
FITS_Writer	This plugin saves a 16 or 32 bit image in FITS format.
Fitter	ImageJ plugin that does curve fitting using the modified CurveFitter class.
FloatArray	This class implements an expandable float array similar to an ArrayList or Vector but more efficient.
FloatBlitter	This class does bit blitting of 32-bit floating-point images.
FloatPolygon	Used by the Roi classes to return float coordinate arrays and to determine if a point is inside or outside of spline fitted selections.
FloatProcessor	This is an 32-bit floating-point image and methods that operate on that image.
FloatStatistics	32-bit (float) image statistics, including histogram.
FloodFiller	This class, which does flood filling, is used by the floodFill() macro function and by the particle analyzer The Wikipedia at "http://en.wikipedia.org/wiki/Flood_fill" has a good description of the algorithm used here as well as examples in C and Java.
FolderOpener	Implements the File/Import/Image Sequence command, which opens a folder of images as a stack.
FontUtil	This class contains static utility methods for replacing fonts that are not available on the current system.
FractalBoxCounter	Calculate the so-called "capacity" fractal dimension.
FreehandRoi	Freehand region of interest or freehand line of interest
FunctionFinder	This class implements the text editor's Macros/Find Functions command.
Functions	This class implements the built-in macro functions.
GaussianBlur	This plug-in filter uses convolution with a Gaussian function for smoothing.
GaussianBlur3D
GelAnalyzer	This plugin generates gel profile plots that can be analyzed using the wand tool.
GenericDialog	This class is a customizable modal dialog box.
GIF_Reader	This plugin opens GIFs and Animated GIFs.
GifWriter	Saves the active image in GIF format, or as an animated GIF if the image is a stack.
Grid	This class implements the Analyze/Tools/Grid command.
GroupedZProjector	This plugin implements the Image/Stacks/Tools/Grouped Z Project command.
GUI	This class consists of static GUI utility methods.
Histogram	This plugin implements the Analyze/Histogram command.
HistogramWindow	This class is an extended ImageWindow that displays histograms.
Hotkeys	Implements the Plugins/Hotkeys/Create Shortcut and Remove commands.
HTMLDialog	This is modal or non-modal dialog box that displays HTML formated text.
HyperStackConverter	Implements the "Stack to HyperStack", "RGB to HyperStack" and "HyperStack to Stack" commands.
HyperStackMaker	This plugin implements the File/New/Hyperstack command.
HyperStackReducer	Implements the Image/HyperStacks/Reduce Dimensionality command.
IJ	This class consists of static utility methods.
IJ.ExceptionHandler
IJEventListener	Plugins that implement this interface are notified when the user changes the foreground color, changes the background color, closes the color picker, closes the Log window or switches to another tool.
IJMath
ImageCalculator	This plugin implements the Process/Image Calculator command.
ImageCanvas	This is a Canvas used to display images in a Window.
ImageConverter	This class converts an ImagePlus object to a different type.
ImageInfo	This plugin implements the Image/Show Info command.
ImageJ	This frame is the main ImageJ class.
ImageJ_Updater	This plugin implements the Help/Update ImageJ command.
ImageJApplet	Runs ImageJ as an applet and optionally opens up to nine images using URLs passed as a parameters.
ImageLayout	This is a custom layout manager that supports resizing of zoomed images.
ImageListener	Plugins that implement this interface are notified when an image is opened, closed or updated.
ImageMath	This plugin implements ImageJ's Process/Math submenu.
ImagePanel	This class is used by GenericDialog to add images to dialogs.
ImagePlus	An ImagePlus contain an ImageProcessor (2D image) or an ImageStack (3D, 4D or 5D image).
ImageProcessor	This abstract class is the superclass for classes that process the four data types (byte, short, float and RGB) supported by ImageJ.
ImageProperties
ImageReader	Reads raw 8-bit, 16-bit or 32-bit (float or RGB) images from a stream or URL.
ImageRoi	An ImageRoi is an Roi that overlays an image.
ImageStack	This class represents an expandable array of images.
ImageStatistics	Statistics, including the histogram, of an image or selection.
ImagesToStack	Implements the Image/Stacks/Images to Stack" command.
ImageWindow	A frame for displaying images.
ImageWriter	Writes a raw image described by a FileInfo object to an OutputStream.
ImportDialog	This is a dialog box used to imports raw 8, 16, 24 and 32-bit images.
Info	Deprecated. replaced by ij.plugin.ImageInfo
Interpreter	This is the recursive descent parser/interpreter for the ImageJ macro language.
Java2	This class contains static methods that use the Java 2 API.
JavaProperties	Displays the Java system properties in a text window.
JavaScriptEvaluator	Implements the text editor's Macros/Run command, and the IJ.runMacroFile() method, when the file name ends with ".js".
JpegWriter	The File/Save As/Jpeg command (FileSaver.saveAsJpeg() method) uses this plugin to save images in JPEG format.
Line	This class represents a straight line selection.
Line.PointIterator	Dedicated point iterator for thin lines.
LineGraphAnalyzer	Implements ImageJ's Analyze/Tools/Analyze Line Graph command.
LineWidthAdjuster	Adjusts the width of line selections.
ListVirtualStack	This plugin opens images specified by list of file paths as a virtual stack.
LogStream	This class provides the functionality to divert output sent to the System.out and System.err streams to ImageJ's log console.
LookUpTable	This class represents a color look-up table.
LUT	This is an indexed color model that allows an lower and upper bound to be specified.
LUT_Editor
LutApplier	This plugin implements the Image/Lookup Tables/Apply LUT command.
LutLoader	Opens NIH Image look-up tables (LUTs), 768 byte binary LUTs (256 reds, 256 greens and 256 blues), LUTs in text format, or generates the LUT specified by the string argument passed to the run() method.
LutViewer	Displays the active image's look-up table.
Macro	The class contains static methods that perform macro operations.
Macro_Runner	This class runs macros and scripts installed in the Plugins menu as well as macros and scripts opened using the Plugins/Macros/Run command.
MacroConstants
MacroExtension
MacroInstaller	This plugin implements the Plugins/Macros/Install Macros command.
MacroRunner	This class runs macros in a separate thread.
MacroToolRunner
MaximumFinder	This ImageJ plug-in filter finds the maxima (or minima) of an image.
Measurements
MeasurementsWriter	Saves a table as a csv or tab-delimited text file.
MedianCut	Converts an RGB image to 8-bit index color using Heckbert's median-cut color quantization algorithm.
Memory	This plugin implements the Edit/Options/Memory command.
MemoryMonitor	This plugin continuously plots ImageJ's memory utilization.
Menus	This class installs and updates ImageJ's menus.
MessageDialog	A modal dialog box that displays information.
Minimizer	Minimizer based on Nelder-Mead simplex method (also known as polytope method), including the 'outside contraction' as described in: J.C.
MontageMaker	Implements the Image/Stacks/Make Montage command.
MultiLineLabel	Custom component for displaying multiple lines.
NewImage	New image dialog box plus several static utility methods for creating images.
NewPlugin	This class creates a new macro or the Java source for a new plugin.
NextImageOpener
NonBlockingGenericDialog	This is an extension of GenericDialog that is non-modal.
OpenDialog	This class displays a dialog window from which the user can select an input file.
Opener	Opens tiff (and tiff stacks), dicom, fits, pgm, jpeg, bmp or gif images, and look-up tables, using a file open dialog or a path.
Options	This plugin implements most of the commands in the Edit/Options sub-menu.
Orthogonal_Views	This plugin projects dynamically orthogonal XZ and YZ views of a stack.
OtherInstance
OvalRoi	Oval region of interest
Overlay	An Overlay is a list of ROIs that can be drawn non-destructively on an Image.
OverlayBrushTool
OverlayCommands	This plugin implements the commands in the Image/Overlay menu.
OverlayLabels	This plugin implements the Image/Overlay/Labels command.
ParticleAnalyzer	Implements ImageJ's Analyze Particles command.
PasteController	Implements ImageJ's Paste Control window.
PGM_Reader	This plugin opens PxM format images.
PixelInspectionTool	This plugin continuously displays the pixel values of the cursor and its surroundings.
Plot	This class creates an image that line graphs, scatter plots and plots of vector fields (arrows) can be drawn on and displayed.
PlotCanvas	This subclass of ImageCanvas has special provisions for plots: - Zooming: sets the plot range - Scrolling: moves data area This behavior is suppressed if the plot is frozen
PlotContentsDialog	This class implements the Plot Window's Data>"Add from Plot", "Add form Table", "Add Fit" and "More>Contents Style" dialogs
PlotDialog
PlotMaker	Plugins that generate "Live" profile plots (Profiler and ZAxisProfiler) displayed in PlotWindows implement this interface.
PlotVirtualStack	This is a virtual stack of frozen plots.
PlotWindow	This class implements the Analyze/Plot Profile command.
PlugIn	Plugins that acquire images or display windows should implement this interface.
PluginClassLoader	ImageJ uses this class loader to load plugins and resources from the plugins directory and immediate subdirectories.
PlugInDialog	This is a non-modal dialog that plugins can extend.
PlugInFilter	ImageJ plugins that process an image should implement this interface.
PlugInFilterRunner
PlugInFrame	This is a closeable window that plugins can extend.
PluginInstaller	Installs plugins dragged and dropped on the "ImageJ" window, or plugins, macros or scripts opened using the Plugins/Install command.
PlugInInterpreter	Plugins that run scripts (e.g., BeanShell, Jython) extend this class.
PlugInTool
PNG_Writer	Saves in PNG format using the ImageIO classes.
PNM_Writer
PointRoi	This class represents a collection of points that can be associated with counters.
PointToolOptions	This plugin implements the Edit/Options/Point Tool command.
PolygonFiller	This class fills polygons using the scan-line filling algorithm described at "http://www.cs.rit.edu/~icss571/filling/".
PolygonRoi	This class represents a polygon region of interest or polyline of interest.
Prefs	This class contains the ImageJ preferences, which are loaded from the "IJ_Props.txt" and "IJ_Prefs.txt" files.
Printer	This plugin implements the File/Page Setup and File/Print commands.
ProfilePlot	Creates a density profile plot of a rectangular selection or line selection.
Profiler	Implements the Analyze/Plot Profile and Edit/Options/Profile Plot Options commands.
Program	An object of this type is a tokenized macro file and the associated symbol table.
ProgressBar	This is the progress bar that is displayed in the lower right hand corner of the ImageJ window.
Projector	This plugin creates a sequence of projections of a rotating volume (stack of slices) onto a plane using nearest-point (surface), brightest-point, or mean-value projection or a weighted combination of nearest- point projection with either of the other two methods (partial opacity).
ProxySettings	This plugin implements the Plugins/Utilities/Proxy Settings command.
RandomAccessStream	This class uses a memory cache to allow seeking within an InputStream.
RankFilters	This plugin implements the Mean, Minimum, Maximum, Variance, Median, Remove Outliers, Remove NaNs and Despeckle commands.
Raw	This plugin implements the File/Import/Raw command.
RecentOpener	Opens, in a separate thread, files selected from the File/Open Recent submenu.
Recorder	This is ImageJ's macro recorder.
RectToolOptions	This plugin implements the rounded rectangle tool dialog box.
Resizer	This plugin implements the Edit/Crop and Image/Adjust/Size commands.
ResultsTable	This is a table for storing measurement results and strings as columns of values.
ResultsTableMacros	This class implements the Apply Macro command in tables.
RGBStackConverter	Converts a 2 or 3 slice stack, or a hyperstack, to RGB.
RGBStackMerge	This plugin implements the Image/Color/Merge Channels command.
RGBStackSplitter	Deprecated; replaced by ij.plugin.ChannelSplitter.
Roi	A rectangular region of interest and superclass for the other ROI classes.
RoiDecoder	This class decodes an ImageJ .roi file.
RoiDefaultsDialog	This plugin implements the Edit/Options/Roi Defaults command.
RoiEncoder	Saves an ROI to a file or stream.
RoiEnlarger	This plugin, which enlarges or shrinks selections, implements the Edit/Selection/Enlarge command.
RoiInterpolator	This class interpolates between ROIs in the ROI Manager.
RoiListener	Plugins that implement this interface are notified when an ROI is created, modified or deleted.
RoiManager	This plugin implements the Analyze/Tools/ROI Manager command.
RoiProperties	Displays a dialog that allows the user to specify ROI properties such as color and line width.
RoiReader	Opens ImageJ, NIH Image and Scion Image for windows ROI outlines.
RoiRotationTool
RoiRotator	This plugin implements the Edit/Selection/Rotate command.
RoiScaler	This plugin implements the Edit/Selection/Scale command.
RoiWriter	Saves the current ROI outline to a file.
RotatedRectRoi	This class implements the rotated rectangle selection tool.
Rotator	This plugin implements the Image/Rotate/Arbitrarily command.
SaltAndPepper	Implements ImageJ's Process/Noise/Salt and Pepper command.
SaveChangesDialog	A modal dialog box with a one line message and "Don't Save", "Cancel" and "Save" buttons.
SaveDialog	This class displays a dialog window from which the user can save a file.
ScaleBar	This plugin implements the Analyze/Tools/Draw Scale Bar command.
ScaleDialog	Implements the Analyze/Set Scale command.
Scaler	This plugin implements the Image/Scale command.
ScreenGrabber	This plugin implements the Plugins/Utilities/Capture Screen and Plugins/Utilities/Capture Image commands.
ScrollbarWithLabel	This class, based on Joachim Walter's Image5D package, adds "c", "z" labels and play-pause icons (T) to the stack and hyperstacks dimension sliders.
Selection	This plugin implements the commands in the Edit/Selection submenu.
Shadows	Implements the commands in the Process/Shadows submenu.
ShapeRoi	A subclass of ij.gui.Roi (2D Regions Of Interest) implemented in terms of java.awt.Shape.
ShortBlitter	This class does bit blitting of 16-bit images.
ShortProcessor	ShortProcessors contain a 16-bit unsigned image and methods that operate on that image.
ShortStatistics	16-bit image statistics, including histogram.
SimpleCommands	This plugin implements the Plugins/Utilities/Unlock, Image/Rename and Plugins/Utilities/Search commands.
Slicer	Implements the Image/Stacks/Reslice command.
SpecifyROI	This plugin implements the Edit/Selection/Specify command.
SplineFitter	This class fits a spline function to a set of points.
Stack_Statistics	This plugin implements the Image/Stacks/Statistics command.
StackCombiner	This plugin implements the Image/Stacks/Combine command.
StackConverter	This class does stack type conversions.
StackEditor	Implements the AddSlice, DeleteSlice and "Stack to Images" commands.
StackInserter	This plugin, which implements the Image/Stacks/Tools/Insert command, inserts an image or stack into another image or stack.
StackLabeler	This plugin implements the Image/Stacks/Label command.
StackMaker	The plugin implements the Image/Stacks/Tools/Montage to Stack command.
StackPlotter
StackProcessor	This class processes stacks.
StackReducer	This plugin implements the Image/Stacks/Tools/Reduce command.
StackReverser	This plugin implements the Image/Transform/Flip Z and Image/Stacks/Tools/Reverse commands.
StackStatistics	Statistics, including the histogram, of a stack.
StackWindow	This class is an extended ImageWindow that displays stacks and hyperstacks.
StackWriter	This plugin, which saves the images in a stack as separate files, implements the File/Save As/Image Sequence command.
Startup	This plugin implements the Edit/Options/Startup command.
StartupRunner	Runs the RunAtStartup (created by Edit/Options/Startup) and AutoRun (in StartupMacros) macros.
Straightener	This plugin implements the Edit/Selection/Straighten command.
StringSorter	A simple QuickSort for String arrays.
SubHyperstackMaker	This plugin is used by the Image/Stacks/Tools/Make Substack command to create substacks of hyperstacks.
SubstackMaker	This plugin implements the Image/Stacks/Tools/Make Substack command.
SurfacePlotter
Symbol	Objects of this class are used as entries in the macro language symbol table.
SyncWindows	This class "synchronizes" mouse input in multiple windows.
Text	This plugin implements the Edit/Options/Fonts command and the dialog displayed when you double click on the text tool.
TextEncoder	Saves an image described by an ImageProcessor object as a tab-delimited text file.
TextFileReader	This plugin displays the contents of a text file in a window.
TextPanel	This is an unlimited size text panel with tab-delimited, labeled and resizable columns.
TextReader	This plugin opens a tab or comma delimeted text file as an image.
TextRoi	This class is a rectangular ROI containing text.
TextWindow	Uses a TextPanel to displays text in a window.
TextWriter	This plugin implements the File/Save As/Text command, which saves the contents of Editor windows and TextWindows (e.g., "Log" and "Results").
ThreadLister	Displays thread information in a text window.
ThreadUtil
ThresholdAdjuster	Adjusts the lower and upper threshold levels of the active image.
Thresholder	This plugin implements the Process/Binary/Make Binary and Convert to Mask commands.
ThresholdToSelection
TiffDecoder	Decodes single and multi-image TIFF files.
TiffEncoder	Saves an image described by a FileInfo object as an uncompressed TIFF file.
Tokenizer	This class converts an imageJ macro file file into a token stream.
Toolbar	The ImageJ toolbar.
Tools	This class contains static utility methods.
Transformer	Implements the Flip and Rotate commands in the Image/Transform submenu.
Translator	This plugin implements the Image/Translate command.
TrimmedButton	This is an extended Button class used to reduce the width of the HUGE buttons on Mac OS X.
TypeConverter	This class converts an ImageProcessor to another data type.
Undo	This class consists of static methods and fields that implement ImageJ's Undo command.
UnsharpMask	This plugin-filter implements ImageJ's Unsharp Mask command.
URLOpener	Opens TIFFs, ZIP compressed TIFFs, DICOMs, GIFs and JPEGs using a URL.
UserFunction	A plugin should implement this interface for minimizing a single-valued function or fitting a curve with a custom fit function.
Variable
VirtualStack	This class represents an array of disk-resident images.
WaitForUserDialog	This is a non-modal dialog box used to ask the user to perform some task while a macro or plugin is running.
Wand	This class implements ImageJ's wand (tracing) tool.
WandToolOptions	This plugin implements the Edit/Options/Wand Tool command.
WildcardMatch	This class allows for simple wildcard pattern matching.
WindowManager	This class consists of static methods used to manage ImageJ's windows.
WindowOrganizer	This class implements the Window menu's "Show All", "Main Window", "Cascade" and "Tile" commands.
Writer	Deprecated.
XY_Reader	This plugin implements the File/Import/XY Coordinates command.
XYCoordinates	Writes the XY coordinates and pixel values of all non-background pixels to a tab-delimited text file.
XYWriter	Saves the XY coordinates of the current ROI boundary.
YesNoCancelDialog	A modal dialog box with a one line message and "Yes", "No" and "Cancel" buttons.
ZAxisProfiler	Implements the Image/Stacks/Plot Z-axis Profile command, which plots the selection mean gray value versus slice number.
Zoom	This plugin implements the commands in the Image/Zoom submenu.
ZProjector	This plugin performs a z-projection of the input stack.