The colour selection window, one of the most important operating windows, has hardly changed in the course of more than two decades. Yet it is by no means ingenious.
Ideas for improvement
For example, a larger, scalable, movable preview of the currently set colour would be desirable. The 100×100 pixel square displayed is too small and too inflexible to effectively assess the colour.
It is also a pity that you can only see the last previously selected colour. A timeline with several previously used colours would be more useful.
The input of colour values via sliders is more practical than a pure numerical input, but it could be even more practical, more direct, more intuitive: it would make sense to be able to vary the current colour via touch on the surface of the display.
In addition to Lab, the HLC model (CIELAB hue/brightness/saturation) should be suggested, because it contains all the CIELAB advantages, is easier to understand and more intuitive, and it would also be very easy to implement in terms of programming.
