double CBCGPColorPickerCtrl::GetLuminance

(

int

nIndex = -1

)

const

Retrieves the luminance component of the selected color

Returns

The luminance component of the color selected in the CBCGPColorPickerCtrl.

Call this function to retrieve the luminance component of the selected color.

Parameters

nIndex

Specifies a color index. If this parametr is -1, the currently selected color is used.