1.Pillow

from PIL import Image
print(dir(pillow))

#打开一个 jpg 图像文件，注意当前路径
im = Image.open('cc.png')
#获得图像尺寸
w,h = im.size
print('Original image size: %sx%s' % (w, h))
#缩放50%
im.thumbnail((w//2,h//2))
print('Resize image to: %sx%s' % (w//2, h//2))
# 把缩放后的图像用jpeg格式保存:
im.save('aa.png', 'png')

2.滤镜

#比如，模糊效果也只需几行代码：
from PIL import Image,ImageFilter

### 1.打开一个 JPG 图像文件，注意是当前路径
im = Image.open('cc.png')
# 应用模糊滤镜
im2 = im.filter(ImageFilter.BLUR)
im2.save('blur.png','png')

from PIL import Image,ImageDraw,ImageFont,ImageFilter
import random

3.随机字母

def rndChar():
    return chr(random.randint(65,90))

# 随机颜色
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*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)
# 创建每个像素
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')

详细文件移步Python学习笔记