python如何在终端里面显示一张图片

# coding:utf-8
import sys

reload(sys)
sys.setdefaultencoding('utf8')
#  __author__ = '郭 璞'
#  __date__ = '2016/8/4'
#  __Desc__ = 一个可以将图片转换成终端字符形式的小工具

from time import *
import Image
class ImageTool():

  def __init__(self):
    print 'Initialization Completed! @',ctime()

  def getChars(self,image_pixels,image_width,image_height):
    replace_chars = 'ABCDEFGHIJKLMNO '
    terminal_chars = ''
    for h in xrange(image_height):
      for w in xrange(image_width):
        point_pixel = image_pixels[w,h]
        terminal_chars +=replace_chars[int(sum(point_pixel)/3.0/256.0*16)]
      terminal_chars+='\n'
    return terminal_chars

  def formatImage(self,imagename,image_width,image_height):
    img = Image.open(imagename,'rb')
    if img.mode != 'RGB':
      img = img.convert('RGB')
    w,h = img.size
    rw = image_width*1.0/w
    rh = image_height*1.0/h
    r = rw if rw<rh else rh
    rw = int(r*w)
    rh = int(r*h)
    img = img.resize((rw,rh),Image.ANTIALIAS)
    return img

  def entrance(self,image_path,out_width,out_height):
    image = self.formatImage(imagename=image_path,image_width=out_width,image_height=out_height)
    image_pixels = image.load()
    out_width ,out_height = image.size
    terminal_chars = self.getChars(image_pixels=image_pixels,image_width=out_width,image_height=out_height)

if __name__ == "__main__":
  tool = ImageTool()
  imagename = sys.argv[1]
  w = int(sys.argv[2])
  h = int(sys.argv[3])
  tool.entrance(imagename,w,h)