Colour Picker - Colour Wheel Panel
The Colour Wheel picker panel lets you pick a colour from the colour wheel and adjust its brightness.
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You can click on the colour wheel to choose a colour. The little white square shows where the current colour is on the wheel. You can click and drag on the wheel.
The slider to the right allows you to change the brightness of the colour. You can click on the colour stripe to change the brightness as well.
You can get an overview of the colour picker here.
