Black and White adjustment

This adjustment comes with a handy Picker setting which allows you to target a colour in the document and adjust the applicable slider.

The following settings can be adjusted in the dialog:

The sliders control the lightness value of the named colour areas of the image. Drag the slider to the left to darken areas of the named colour, drag the slider to the right to lighten them.
Picker—allows you to drag on the image to modify the adjustment. The initial click will identify the predominant colour, dragging left will darken areas of the identified colour while dragging right will lighten them. The corresponding slider will be updated.