Sorry, I dont understand...

The images posted gave me the idea that this was something that would fit into the color picker tool slot bottom right hand corner - into which we can drop a .col file. But the link delivered a PNG file and then also a rar file - none of which seem executable...

I had imagined that this might be a way to derive colors from an image file that are then loaded into this as a color chart.

But how is this different from loading colors in the color samples floating panel - other than in its half circular shape?

Sorry if I have misunderstood