code: public Pixel setARGB_fromDouble(double a, double r, double g, double b){
  		return setValue(Pixel.argb_fromNormalized(a, r, g, b));
  	}
docs: Sets an ARGB value at the position currently referenced by this Pixel. <br>
  Each channel value is assumed to be within [0.0 .. 1.0]. Channel values
  outside these bounds will be clamped to them.
  @param a normalized alpha
  @param r normalized red
  @param g normalized green
  @param b normalized blue
  @throws ArrayIndexOutOfBoundsException if this Pixel's index is not in
  range of the Img's data array.
  
  @see #setRGB_fromDouble(double, double, double)
  @see #setRGB_fromDouble_preserveAlpha(double, double, double)
  @see #setARGB(int, int, int, int)
  @see #a_asDouble()
  @see #r_asDouble()
  @see #g_asDouble()
  @see #b_asDouble()
  @since 1.2