python使用PIL縮放網絡圖片並保存的方法
本文實例講述了python使用PIL縮放網絡圖片並保存的方法。分享給大家供大家參考。具體實現方法如下：
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 ''' tk_image_view_url_io_resize.py display an image from a URL using Tkinter, PIL and data_stream also resize the web image to fit a certain size display widget retaining its aspect ratio Pil facilitates resizing and allows file formats other then gif tested with Python27 and Python33 by vegaseat 18mar2013 ''' import io from PIL import Image, ImageTk try: # Python2 import Tkinter as tk from urllib2 import urlopen except ImportError: # Python3 import tkinter as tk from urllib.request import urlopen def resize(w, h, w_box, h_box, pil_image): ''' resize a pil_image object so it will fit into a box of size w_box times h_box, but retain aspect ratio ''' f1 = 1.0*w_box/w # 1.0 forces float division in Python2 f2 = 1.0*h_box/h factor = min([f1, f2]) #print(f1, f2, factor) # test # use best down-sizing filter width = int(w*factor) height = int(h*factor) return pil_image.resize((width, height), Image.ANTIALIAS) root = tk.Tk() # size of image display box you want w_box = 400 h_box = 350 # find yourself a picture on an internet web page you like # (right click on the picture, under properties copy the address) # a larger (1600 x 1200) picture from the internet # url name is long, so split it url1 = "http://freeflowerpictures.net/image/flowers/petunia/" url2 = "petunia-flower.jpg" url = url1 + url2 image_bytes = urlopen(url).read() # internal data file data_stream = io.BytesIO(image_bytes) # open as a PIL image object pil_image = Image.open(data_stream) # get the size of the image w, h = pil_image.size # resize the image so it retains its aspect ration # but fits into the specified display box pil_image_resized = resize(w, h, w_box, h_box, pil_image) # optionally show resized image info ... # get the size of the resized image wr, hr = pil_image_resized.size # split off image file name fname = url.split('/')[-1] sf = "resized {} ({}x{})".format(fname, wr, hr) root.title(sf) # convert PIL image object to Tkinter PhotoImage object tk_image = ImageTk.PhotoImage(pil_image_resized) # put the image on a widget the size of the specified display box label = tk.Label(root, image=tk_image, width=w_box, height=h_box) label.pack(padx=5, pady=5) root.mainloop()希望本文所述對大家的Python程序設計有所幫助。
