python通过PIL缩放互联网上的图片并保存
- ''' 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()
来源: http://www.phpxs.com/code/1004877/