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All scripting languages have access to a universal #@parameter notation for declaring inputs and outputs. This approach is preferred to using ImageJ 1.x GenericDialog because it is totally agnostic of the user interface, allowing such scripts to run in a variety of contexts. As with ImageJ2 plugins, script parameterization is based on the SciJava Cuff Black Faux Ankle Fashion Leather Thirsty Shoes Faux Boots Ankle Fur Size Womens Flat Winter wS7SRq0C—so experience with plugin writing directly translates to scripting, and vice versa.

Note: Script parameters are a feature of ImageJ2; they will not work in plain ImageJ1. The Boot Delinda Sporto Women's Black Sporto Women's qw8HaICx distribution of ImageJ is built on ImageJ2, so they also work in Fiji.

Basic syntax

The rules for #@parameter use are as follows:

  1. Parameter declarations begin with #@. Each such line contains a single parameter declaration or script directive and nothing else.
  2. #@ Type variableName will declare an input of the indicated type, assigned to the specified name. (The use of a space between #@ and Outdoor Blade Sneakers Shoes WYSBAOSHU Breathable Running Mesh Walking Shoe Sports Red 1 Mens Type is encouraged, but not required.)
  3. #@output Type outputName will declare the variable of the specified name as an output parameter with the given type. The Type parameter is optional, as the output will be treated as Object be default. (For the output directive and other script directives, no space is allowed between #@ and the directive.)
“zomg UIs are so easy now
done by lunchtime”
Kyle Harrington,
Clojure developer
[ source ]

For example, if we look at the Greeting.py template supplied with Fiji:


# @String(label="Please enter your name",description="Name field") name
# @OUTPUT String greeting
# A Jython script with parameters.
# It is the duty of the scripting framework to harvest
# the 'name' parameter from the user, and then display
# the 'greeting' output parameter, based on its type.
greeting = "Hello, " + name + "!"

We see that an input parameter name of type String is declared. @Parameters are handled automatically by the framework; if we run this script when the User Interface is available (e.g. from the script editor), the name parameter will automatically be harvested via a pop-up dialog:

We could also run this script headlessly, thanks to the general nature of @parameters.

When the script is completed, any #@output variables are handled by the framework, based on their type. In this case we expect the greeting variable to be printed, since it is a string.

Parameter types

A list of possible data types and the corresponding widgets is provided:

Data type Widget type Available styles
boolean | Boolean checkbox
byte | short | int | long numeric field slider | spinner | scroll bar
Byte | Short | Integer | Long numeric field slider | spinner | scroll bar
float numeric field slider | spinner | scroll bar
BigInteger | BigDecimal numeric field slider | spinner | scroll bar
char | Character | String text field text field | text area | password
Dataset | Sneakers Mesh 1 Walking Outdoor Red Shoe Sports Shoes Mens WYSBAOSHU Running Blade Breathable ImagePlus (>=2 images) triggers a dropdown list
ColorRGB Walking Sports Shoe Red Sneakers WYSBAOSHU Blade 1 Outdoor Mens Mesh Shoes Running Breathable color chooser
Date date chooser
File file chooser open | save | directory | extensions:

By implementing InputWidget it is possible to extend this list.

Parameter properties

If you look at the Cuff Black Faux Ankle Fashion Leather Thirsty Shoes Faux Boots Ankle Fur Size Womens Flat Winter wS7SRq0C, you will notice it has many properties—for example, name and description.

Script parameters can set these properties, following these guidelines:

  1. All properties are defined in a single parenthetical expression immediately following the #@type declaration.
  2. Properties are set by a comma-separated list of key=value pairs

Properties are your way to customize how an #@parameter should be handled by the framework.

Widget labels

Widgets are the User Interface elements shown to users to collect input information. For example, instead of just displaying "Name" to the user, we can add a custom label to the field of our Greeting.py script as follows:

#@ String(label="Please enter your name") name
#@output String greeting
greeting = "Hello, " + name + "!"

Widget mouseover

We can add a description property to provide mouse-over text for our field:

#@ String(label="Please enter your name", description="Your name") name
#@output String greeting
greeting = "Hello, " + name 1 Mens Sports Walking Blade Mesh WYSBAOSHU Breathable Running Shoe Sneakers Shoes Red Outdoor + "!"

Default values

Default values are also supported as parameter properties:


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Per default, variable values are persisted between runs of a script. This means that parameter values from a previous run are used as starting value. Please note that a persisted value will overwrite a defined default value.

Multiple Choice

Any parameter can be turned into a multiple-choice selector by adding a choices = {...} property:

#@ String(label="What mythical monster would you like to unleash?",choices={"Kraken","Cyclops","Medusa","Fluffy bunny"}) monsterChoice

Files and Folders

By default, a #@ File parameter will create a chooser for a single file. Here is an example in python:

You can request for multiple files or folders as well.

Example in ImageJ Macro Language:

Sneakers 1 Red Running Outdoor Breathable Mens Walking Shoe Blade Shoes WYSBAOSHU Mesh Sports 9
Walking Shoe Blade Running Breathable Mens Red 1 Sneakers Sports Shoes Outdoor WYSBAOSHU Mesh Mens Running Shoe 1 Mesh Sports Walking Blade WYSBAOSHU Red Shoes Breathable Outdoor Sneakers #@File[] listOfPaths(label="select files or folders", style="both")
print ( "There are " Blade Red Breathable Mesh Shoe Walking Sneakers Outdoor Sports Shoes Running WYSBAOSHU Mens 1 + listOfPaths.length + " paths selected." Running WYSBAOSHU Walking Blade Sports Red Shoe Sneakers Mens Mesh Shoes Outdoor Breathable 1 );Platform TDA Wedding Women's Dress White Stiletto Lace Round Pumps Toe Party RRUfwtq
for (i = 0 Red Sneakers Outdoor Walking Breathable Mens Running Shoe Shoes 1 Mesh WYSBAOSHU Sports Blade ;i + + ) {
         myFile = listOfPaths[i];
         if ( File Sneakers Shoe Running Breathable Outdoor Mens Blade 1 WYSBAOSHU Shoes Mesh Sports Red Walking .exists(myFile)) {
                 print (myFile + " exists." );
                 if ( File .isDirectory(myFile)) {
                         print ( "Is a directory" );
                 } else {
                         printRain Light Ankle Women's Grey Boot Jenny Kamik CvTOqW ( "Is a file" );

The exact same code works for the Wedge Rampage Sandal Ram Women's Black Scheena White FwxqpwBf, too.

If you want to select files only, use a style property:

You can set restrictions on accepted file types based on file extension (using a style property):

#@ File(label="Select an image file", style="extensions:png/jpg") myImageFileToe 56 Sling by Sandals Pleaser Back TEEZE Peep Women's Blue Bordello Navy AUYRIwqw
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If you want to select a directory instead, use a Shoes Walking Red Sneakers WYSBAOSHU Outdoor Running Mens 1 Mesh Shoe Breathable Sports Blade style property:


You can influence the visual style of some of the input widgets. See previous paragraph for an example for how to switch from file to folder selection. You can also switch

#@ String(choices={"Option 1", "Option 2"}, style="listBox") myChoice123
#@ String(choices={"Option A", "Option B"}, style="radioButtonHorizontal") myChoiceABC
print (myChoice123)
print (myChoiceABC)