an be illustrated by using a range of examples
such as a map, heatmap, scatter plot, perspective 3D surface etc.
</p>
<p>To demonstrate different types of deficiencies, the active palette may be
desaturated (emulating printing on a grayscale printer) and collapsed to
emulate different types of color-blindness (without red-green or green-blue
contrasts) using the <code>simulate_cvd</code> functions.
</p>
<p><code>choose_palette</code> by default starts the Tcl/Tk version of the GUI while
<code>hclwizard</cod