public GColor withAlpha(int newAlpha) {
		return new GColor(id, newAlpha);
	}
Creates a transparent version of this GColor. If the underlying value of this GColor changes,
the transparent version will also change.
@param newAlpha the transparency level for the new color
@return a transparent version of this GColor
Ghidra/Framework/Gui/src/main/java/generic/theme/GColor.java