Learning IJ scripting language: Part II

IJ Scripting Language - Part II: Table of Contents

In this series of posts, more programming techniques of the ImageJ scripting macro language are detailed...

Drawing a chessboard using Stack Tools

A really non optimized way for Drawing a Chessboard but a good opportunity to explore the functions available in Image > Stacks, specially those located in the submenu Stacks > Tools.

Test image: bump and hill

A simple test image useful to try various algorithms of gradient, edge detection,...

Drawing arrows in IJ script

Drawing arrows in a ImageJ macro/script is sometimes useful to display direction of a feature (oriented lines of interest, gradient,etc.)  but this simple drawing isn't so straightforward...

Using images as arrays in script

In my previous posts Using arrays in script... [TOC],  we have seen in Part 1 how to store data in arrays using the built-in function newArray(...)  and in Part 2, the use of Table windows (Results [Link] or any Table window [Link]). Here I'll describe how data storage can be done via images and how this technique is powerful for large arrays.

Fade-in, Fade-out, Dissolve video effects

When working on videos (stacks in ImageJ), it is always interesting to make transitions between video clips to finalize a small movie .... and that's possible with ImageJ.

The sieve of Eratosthenes

Finding prime numbers is a good exercise to improve your skills in the programming scripting language of ImageJ. Moreover, that's a good opportunity to use a 2D image as a temporary array.

Drawing a chessboard from a 2x2 unit cell

In my series Drawing a chessboard, a simple way to build the chessboard from a 2x2 unit cell. 

Drawing a chessboard using boolean operators

A small use of boolean operators to draw my favorite chessboard and also a good example to use other functions like geometrical transforms.

Drawing a chessboard: Table of Contents

Through several examples, this series Drawing a chessboard - a simple and graphical object - is a very good opportunity to explore the built-in functions of the scripting language and the various operations and tools available in the ImageJ menus.

Drawing a chessboard using ImageJ array

My chessboard series continues with a new script based on arrays and how we can use them in ImageJ.

Test image: sawtooth wave

After the square wave [see post], another test image whose plot profile corresponds to a sawtooth wave [Wikipedia].

Test image: square wave

To try new features of ImageJ or debug a macro/script, there is always a need of test images. Here is a simple script to create one of them...

Using arrays (part 2.1): Table window

The Results window [see post] is a 'must' in ImageJ for storing numbers like a spreadsheet and also contains tools to explore the data. A more generalized multicolumn window exists in ImageJ termed the Table window which is very useful specially if you need to play with strings and numbers.

Using arrays in script (part 2.0): Results window

If the Array and List data structures are too limited in one of your IJ script, there is an interesting alternative for storing a data collection: The Results which is a specific window (tool?) working like a very basic spreadsheet...

Learning ImageJ scripting language

T a b l e   o f   c o n t e n t s

Once you are familiar with the various tools and menus of ImageJ, it's time to move to the dark side of the force and to start using the programming features of IJ via its macro/script. That's really useful specially if you have repetitive tasks and/or if you need precise data exploration.
Don't worry, learning a programming language is not so complicated and ...May the Force be with you...

Drawing a chessboard v2.1

This version of my series Drawing a chessboard is a minor update of the version 2.0 and is only different because it contains one loop to scan the image.

Drawing a chessboard v2.0

Another version in my series Drawing a chessboard. This is a little bit simpler than the previous one...

My first ImageJ macro/script

Once you are familiar with the various tools and menus of ImageJ, it's time to move to the dark side of the force and to start using the programming features of IJ via its macro/script. That's really useful specially if you have repetitive tasks and/or if you need precise data exploration.
Don't worry, learning a programming language is not so complicated and ...May the Force be with you...

ImageJ script: the loop

One of the main purposes of a ImageJ macro/script is to perform repetitive tasks. In programming languages (and in IJ script), this can be done by using a specific iterative mechanism: the loop.