Python中怎么像PS一样处理图像

$ sudo apt-get install python-imaging

$ sudo easy_install PIL

import Image

# 打开一个jpg图像文件，注意路径要改成你自己的:

im = Image.open('/Users/michael/test.jpg')

# 获得图像尺寸:

w, h = im.size

# 缩放到50%:

im.thumbnail((w//2, h//2))

# 把缩放后的图像用jpeg格式保存:

im.save('/Users/michael/thumbnail.jpg', 'jpeg')

import Image, ImageFilter

im = Image.open('/Users/michael/test.jpg')

im2 = im.filter(ImageFilter.BLUR)

im2.save('/Users/michael/blur.jpg', 'jpeg')

import Image, ImageDraw, ImageFont, ImageFilter

import random

# 随机字母:

def rndChar():

  return chr(random.randint(65, 90))

# 随机颜色1:

def rndColor():

  return (random.randint(64, 255), random.randint(64, 255), random.randint(64, 255))

# 随机颜色2:

def rndColor2():

  return (random.randint(32, 127), random.randint(32, 127), random.randint(32, 127))

# 240 x 60:

width = 60 * 4

height = 60

image = Image.new('RGB', (width, height), (255, 255, 255))

# 创建Font对象:

font = ImageFont.truetype('Arial.ttf', 36)

# 创建Draw对象:

draw = ImageDraw.Draw(image)

# 填充每个像素:

for x in range(width):

  for y in range(height):

    draw.point((x, y), fill=rndColor())

# 输出文字:

for t in range(4):

  draw.text((60 * t + 10, 10), rndChar(), font=font, fill=rndColor2())

# 模糊:

image = image.filter(ImageFilter.BLUR)

image.save('code.jpg', 'jpeg');

IOError: cannot open resource

'/Library/Fonts/Arial.ttf'