OK, I have often wanted to adjust the "Pick Colour from Screen" colour picker. I've tried the moving the "target" within the Colour schema, but found it far to clumsy. Enter the Slider!
Presently I have a view of a very dusting, hot, lots of white space and a subtle sepia to green colour way image. I have picked the colour-up for the Text, but it is just too similar to the image. Colour Slider did it.
Grazie