arcgis desktop - Adding ECW file to MXD with ArcPy?

I'm using Desktop 10.2 and I tried ,with this script, to add ecw file to mxd's but the result is a black & white raster(stretched symbology) instead of colored raster(RGB composite symbology) :

import arcpy
import arcpy.mapping
import os

import sys
from arcpy import env
import string


env.workspace = r"C:\project"
for mxd in arcpy.ListFiles("*.mxd"):
  print mxd
  mapdoc = arcpy.mapping.MapDocument(r"C:\project\\" + mxd)
  df = arcpy.mapping.ListDataFrames(mapdoc, "Layers")[0]

  Layer1 = arcpy.mapping.Layer(r"C:\project\layers\F1292_KVISH6_25CM_.ecw")
  arcpy.mapping.AddLayer(df ,Layer1 )
  mapdoc.save()
del mxd # i added

this is the image i get:

i don't know how to changed the python script so i will get RGB colored image ?

Answer

Manually save a layer file of the raster in the r g b format. Then, use the same code as you did, but reference the saved .lyr file instead.