The Colour Balance adjustment provides a way to modify the contribution of particular colours to a set tonal range.
Settings
Apply this adjustment via the Adjustments panel using the following settings:
Range—determines the tones to be adjusted.
The sliders control the balance between the two named colours. Drag the slider toward the colour you wish to emphasise.
Opacity—sets the level of visibility of the adjustment.
Preserve Lum.—if this option is off (default), the adjustment ignores the original lightness value of pixels. When selected, the adjustment modifies pixel colours with respect to their original lightness value.
Merge—merges the current adjustment layer with the layer immediately below it in the layer order.
Delete—closes the settings and deletes the adjustment layer, removing the adjustment.