python3 pillow模块实现简单验证码

更新时间：2020-08-05 14:24:01 作者：startmvc

本文实例为大家分享了python3pillow模块验证码的具体代码，供大家参考，具体内容如下直接

本文实例为大家分享了python3 pillow模块验证码的具体代码，供大家参考，具体内容如下

直接放代码吧，该写的注释基本都写了


# -*- coding: utf-8 -*-
# __author__: Pad0y

from PIL import Image, ImageDraw, ImageFont
from random import choice, randint, randrange
import string

# 候选字符集,大小写字母+数字
chrs = string.ascii_letters + string.digits


def selected_chrs(length):
 """
 返回length个随机字符串
 :param length:
 :return:
 """
 result = ''.join(choice(chrs) for _ in range(length))
 return result


def get_color():
 """
 设置随机颜色
 :return:
 """
 r = randint(0, 255)
 g = randint(0, 255)
 b = randint(0, 255)
 return (r, g, b)


def main(size=(200, 100), chrNumber=6, bgcolor=(255, 255, 255)):
 """
 定义图片大小，验证码长度，背景颜色
 :param size:
 :param chrNumber:
 :param bgcolor:
 :return:
 """
 # 创建空白图像和绘图对象
 image_tmp = Image.new('RGB', size, bgcolor)
 draw = ImageDraw.Draw(image_tmp)

 # 生成并计算随机字符的宽度和高度
 text = selected_chrs(chrNumber)
 font = ImageFont.truetype('c:\\windows\\fonts\\Roboto-Regular.ttf', 48) # 选定一款系统字体
 width, height = draw.textsize(text, font)
 if width + 2*chrNumber > size[0] or height > size[1]:
 print('Size Error!')
 return

 # 绘制字符串
 startX = 0
 width_eachchr = width // chrNumber # 计算每个字符宽度
 for i in range(chrNumber):
 startX += width_eachchr + 1
 position = (startX, (size[1]-height)//2+randint(-10, 10)) # 字符坐标, Y坐标上下浮动
 draw.text(xy=position, text=text[i], font=font, fill=get_color()) # 绘制函数

 # 对像素位置进行微调，实现验证码扭曲效果
 img_final = Image.new('RGB', size, bgcolor)
 pixels_final = img_final.load()
 pixels_tmp = image_tmp.load()
 for y in range(size[1]):
 offset = randint(-1, 0) # randint()相当于闭区间[x,y]
 for x in range(size[0]):
 newx = x + offset # 像素微调
 if newx >= size[0]:
 newx = size[0] - 1
 elif newx < 0:
 newx = 0
 pixels_final[newx, y] = pixels_tmp[x, y]

 # 绘制随机颜色随机位置的干扰像素
 draw = ImageDraw.Draw(img_final)
 for i in range(int(size[0]*size[1]*0.07)): # 7%密度的干扰像素
 draw.point((randrange(size[0]), randrange(size[1])), fill=get_color()) # randrange取值范围是左开右闭

 # 绘制随机干扰线，这里设置为8条
 for i in range(8):
 start = (0, randrange(size[1]))
 end = (size[0], randrange(size[1]))
 draw.line([start, end], fill=get_color(), width=1)

 # 绘制随机弧线
 for i in range(8):
 start = (-50, -50) # 起始位置在外边看起来才会像弧线
 end = (size[0]+10, randint(0, size[1]+10))
 draw.arc(start+end, 0, 360, fill=get_color())

 # 保存图片
 img_final.save('Veri_code.jpg')
 img_final.show()


if __name__ == '__main__':
 main((200, 100), 6, (255, 255, 255))

效果图如下