今天我們要學習的內容是如何利用Python生成一個隨機的中文驗證碼,並將圖片保存為.jpeg格式,需要的朋友可以參考下
在這之前,你首先得了解Python中的PIL函式庫。 PIL是Python Imaging Library的簡稱,PIL是一個Python處理圖片的庫,提供了一系列模組和方法,例如:裁剪,平移,旋轉,改變尺寸等等。在PIL庫中,任何一個圖像都是用Image物件來表示的,所以要載入一張圖片,最簡單的形式如下:
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from PIL import Image image = Image.open("1.jpeg")
PIL的下載網址為:
http://www.pythonware.com/products/pil/
(1)改變圖片大小
from PIL import Image image = Image.open("1.jpeg") new_img = image.resize((256,256),Image.BILINEAR) new_img.save("2.jpeg")
from PIL import Image image = Image.open("1.jpeg") new_img = image.rotate(45) new_img.save("2.jpeg")
(3)直線繪製PIL庫中的ImageDraw模組提供了圖形繪製的基本功能,可以繪製直線,弧線,橢圓,矩形等等。
from PIL import Image,ImageDraw image = Image.open("2.jpeg") draw = ImageDraw.Draw(image) width,height = image.size draw.line(((0,0),(width-1,height-1)),fill=255) draw.line(((0,height-1),(width-1,0)),fill=255) image.save("2.jpeg")
from PIL import Image,ImageDraw image = Image.open("2.jpeg") draw = ImageDraw.Draw(image) width,height = image.size draw.arc((0,0,width-1,height-1),0,360,fill=255) image.save("2.jpeg")
# -*- coding: utf-8 -*- from PIL import Image,ImageDraw,ImageFont import random import math, string class RandomChar(): @staticmethod def Unicode(): val = random.randint(0x4E00, 0x9FBF) return unichr(val) @staticmethod def GB2312(): head = random.randint(0xB0, 0xCF) body = random.randint(0xA, 0xF) tail = random.randint(0, 0xF) val = ( head << 8 ) | (body << 4) | tail str = "%x" % val return str.decode('hex').decode('gb2312') class ImageChar: def __init__(self, fontColor = (0, 0, 0), size = (100, 40), fontPath = 'SIMSUN.TTC', bgColor = (255, 255, 255), fontSize = 20): self.size = size self.fontPath = fontPath self.bgColor = bgColor self.fontSize = fontSize self.fontColor = fontColor self.font = ImageFont.truetype(self.fontPath, self.fontSize) self.image = Image.new('RGB', size, bgColor) def rotate(self): self.image.rotate(random.randint(0, 30), expand=0) def drawText(self, pos, txt, fill): draw = ImageDraw.Draw(self.image) draw.text(pos, txt, font=self.font, fill=fill) def randRGB(self): return (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)) def randPoint(self): (width, height) = self.size return (random.randint(0, width), random.randint(0, height)) def randLine(self, num): draw = ImageDraw.Draw(self.image) for i in range(0, num): draw.line([self.randPoint(), self.randPoint()], self.randRGB()) def randChinese(self, num): gap = 5 start = 0 for i in range(0, num): char = RandomChar().GB2312() x = start + self.fontSize * i + random.randint(0, gap) + gap * i self.drawText((x, random.randint(-5, 5)), RandomChar().GB2312(), self.randRGB()) self.rotate() self.randLine(18) def save(self, path): self.image.save(path) ic = ImageChar(fontColor=(100,211, 90)) ic.randChinese(4) ic.save("1.jpeg")