Alternatively, you can have a volume left / volume right arrangement. You can compare this to the two controls on you HiFi: typically, you have one control for volume, another for balance.

When you switch to the HSL colour space, the sliders take on different roles. You can turn this into a competition: the similarity goal can be changed (preset to 10%), and Reset starts a seconds timer next to it. The bar below the slider indicates similarity on a %-scale. You will need to use all three sliders with normal colour vision: human colour vision is trichromatic or three-dimensional. Try to match the colour at the left bottom with the left top colour. If you find all of this bewildering and difficult, welcome to the club! I’ve spent decades on it… What to doĮffectively, you can see this as a game: can I match the colour, and if so, how fast? With the pop-up at the very top you can alternatively select the HSL colour space, where the letters stand for H=hue, S for saturation (=“strength” of the colour), and L=lightness (similar to brightness). Initially the mixing sliders control an RGB space: left for red, middle for green, right for blue. The upper colour square (preset to blue) is the one you can change with the three mixing sliders. It is randomly selected each time you press Reset. The lower one is the target colour, the one you’ll want to match.

In the adjoining demo you see in the left part two coloured squares atop each other.

Color match game