API Frame SetBackdropColor

s provide two methods to apply tint to their : frame:SetBackdropColor(red, green, blue[, alpha]) frame:SetBackdropBorderColor(red, green, blue[, alpha])
 * SetBackdropColor tints the background component of a frame's backdrop
 * SetBackdropBorderColor tints the border component of a frame's backdrop

Arguments

 * red : Number - Proportion of the original red colour to remain, from 0 to 1
 * green : Number - Proportion of the original green colour to remain, from 0 to 1
 * blue : Number - Proportion of the original blue colour to remain, from 0 to 1
 * alpha : Number - Proportion of the original opaqueness to remain, from 0 to 1