The Hue Game
This game is based on an online demonstration of xrite.com and is included in Fiji to demonstrate a couple of things:
- Humans’ color perception is a tricky thing (take home lesson: use color maps to analyze images visually)
- how to override ImageJ 1.x’s mouse listeners from a script
- that you can have fun in Fiji
It is also educating to play with the hues that are displayed. The script represents colors in the CIELab space. The L axis represents the luminance. The a and b axes represent the hue (a is often referred to as the green/red axis and b as yellow/blue one, but this is not quite an accurate notion).
The four grid lines of the game display evenly spaced color samples along the sides of a quadrilateral in the plane defined by L = 72.
To play with the script, hold down the ⇧ Shift key and then open the Plugins › Examples menu and click on The Hue Game (hold the ⇧ Shift key pressed down all while doing that). This will open the script in the Script Editor. Just change the numbers in the second-to-last line of the script (the 72 is the luminance, the next parameter is a list of the a coordinates of the quadrilateral, followed by the b coordinates). Then call the script with Run>Run.