本文实例为大家分享了python放大图片和画方格的具体代码，供大家参考，具体内容如下

1、Python 放大图片和画方格算法

#!C:/Python27 # -*- coding: utf-8 -*- import os import sys from PIL import Image,ImageDraw def make_doc_data(lf): #li, ri = make_regalur_image(Image.open(lf)), make_regalur_image(Image.open(rf))#两张图片方法 li = Image.open(lf) size = (256, 256) #几何转变，全部转化为256*256像素大小 li =li.resize(size).convert('RGB') li.save(lf + '_regalur.png')#转换图片格式:img.save('file.jpg'),保存临时的 #ri.save(rf + '_regalur.png')#img对象到硬盘 fd = open('stat.csv', 'w')#stat模块是做随机变量统计的，stat用来计算随机变量的期望值和方差 #这句是关键啊，把histogram的结果进行map处理 #fd.write('\n'.join(l + ',' + r for l, r in zip(map(str, li.histogram()), map(str, ri.histogram())))) fd.write(','.join(map(str, li.histogram()))) fd.close() li = li.convert('RGB') #与save对象，这是转换格式 draw = ImageDraw.Draw(li) for i in xrange(0, 256, 64): draw.line((0, i, 256, i), fill = '#ff0000') draw.line((i, 0, i, 256), fill = '#ff0000') #从始至终划线!通过把每一列刷成红色，来进行颜色的随机分布划分 #用法：pygame.draw.line(Surface, color, start_pos, end_pos, width=1) li.save(lf + '_lines.png') make_doc_data('testpic/1370.bmp')

2、放大缩小图片的几种方法

#!C:/Python27 #coding=utf-8 import pytesseract from pytesser import * from PIL import Image,ImageEnhance,ImageFilter import os import fnmatch import re,time import urllib, random #修改文件名 #os.rename("E:/pythonScript/Model/font/2.bmp","E:/pythonScript/Model/font/dock2.bmp") def CutImg(): img = Image.open('.//6907.jpg').convert('L') print img.size w, h = img.size #rowheight = h // rownum #colwidth = w // colnum #imgry.show() j = 10 for i in range(4): x = 10 + i*24 #验证码的x,y坐标 y = 6 img.crop((x-4, y,x+6, y+14)).save("pic/%d.bmp" % j) print "j=",j j += 1 img.close() infile = ('.//testpic//001n.bmp') outfile = ('.//testpic//001n.png') def fixed_size(infile): """按照固定尺寸处理图片""" im = Image.open(infile) size = (256, 256) im2 =im.resize(size).convert('RGB') out = im2.resize(size,Image.ANTIALIAS) out.save(outfile) print u"\n按固定尺寸放大图片,处理已完成" def resize_by_width(w_divide_h): """按照宽度进行所需比例缩小""" im = Image.open(infile) print im.size (x, y) = im.size x_s = x print x_s y_s = x/w_divide_h #w_divide_h > x print y_s out = im.resize((x_s, y_s), Image.ANTIALIAS) out.save(outfile) def resize_by_height(w_divide_h): """按照高度进行所需比例缩放""" im = Image.open(infile) (x, y) = im.size print im.size x_s = y*w_divide_h y_s = y out = im.resize((x_s, y_s), Image.ANTIALIAS) out.save(outfile,quality = 95,dpi=(72, 72)) def cut_by_ratio(width, height): """按照图片长宽比进行分割""" im = Image.open(infile) width = float(width) height = float(height) (x, y) = im.size if width > height: region = (0, int((y-(y * (height / width)))/2), x, int((y+(y * (height / width)))/2)) elif width < height: region = (int((x-(x * (width / height)))/2), 0, int((x+(x * (width / height)))/2), y) else: region = (0, 0, x, y) #裁切图片 crop_img = im.crop(region) #保存裁切后的图片 crop_img.save(outfile) def Lager(size): im = Image.open(infile) im_resized=im.resize(size, Image.ANTIALIAS) im_resized.save(outfile,quality = 95,dpi=(72, 72)) def mohuimg(): """ 模糊图片 """ im = Image.open(infile) im2 = im.filter(ImageFilter.BLUR) im2.save(outfile) """ 多种尺寸icon的存储 """ image_size = [512,250,144,140,128,120,108,100,88,72,48,32,28] def create_icon(): for size in image_size: '''''pri_image = Image.open("icon.png") pri_image.thumbnail((size,size)) image_name = "icon_%d.png"%(size) pri_image.save(image_name)''' pri_image = Image.open(infile) pri_image.resize((size,size),Image.ANTIALIAS ).save("testpic/icom_%d.png"%(size)) fixed_size(infile) #resize_by_width(10) #resize_by_height(1) #cut_by_ratio(50,20) #Lager(256) #mohuimg() #create_icon() #CutImg()

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。