Create thumbnail by resizing image in Python

Sometimes we need to create thumbnails of certain size from image. In this post I show you how to create thumbnail by resizing image in Python.
Here is the Python code for creating thumbnail / resizing an image:

import Image

def generate_and_save_thumbnail(imageFile, h, w, ext):
    image = Image.open(imageFile)
    image = image.resize((w, h), Image.ANTIALIAS)
    outFileLocation = "./images/"
    outFileName = "thumb"
    image.save(outFileLocation + outFileName + ext)

# set the image file name here
myImageFile = "myfile.jpg"
# set the image file extension
extension = ".jpg"
# set height
h = 200
# set width
w = 200

generate_and_save_thumbnail(myImageFile, h, w, extension)
The second argument of image.resize() is the filter. You have several options there:
  • Image.ANTIALIAS
  • Image.BICUBIC
  • Image.BILINEAR
  • Image.NEAREST

Each uses different algorithm. For downsampling (reducing the size) you can use ANTIALIAS. Other filers may increase the size.

You can also look at the following Python modules:

Comments

Unknown said…
Accepting height before width is just plain evil :)

Cheers for the code snippit
October 26, 2008 at 4:36 AM
wingi said…
ANTIALIAS is for best quality and big cpu usage - saving image/file size can only triggerd by saving with lower quality setting.

Your example with ignore the aspect ratio of the source image ... look at united-coders.com for a more detailed example!
March 24, 2010 at 6:04 AM
Post a Comment

Popular posts from this blog

Strip HTML tags using Python

We often need to strip HTML tags from string (or HTML source). I usually do it using a simple regular expression in Python. Here is my function to strip HTML tags: def remove_html_tags(data): p = re.compile(r'<.*?>') return p.sub('', data) Here is another function to remove more than one consecutive white spaces: def remove_extra_spaces(data): p = re.compile(r'\s+') return p.sub(' ', data) Note that re module needs to be imported in order to use regular expression. Here you can find an updated code that gets the text from html: http://love-python.blogspot.com/2011/04/html-to-text-in-python.html
Read more

lambda magic to find prime numbers

Find prime number up to 100 with just 3 lines of code. The 4th line is for printing ;) nums = range(2, 100) for i in range(2, 10):     nums = filter(lambda x: x == i or x % i, nums) print nums Isn't it amazing? Check my new post about Prime number: http://love-python.blogspot.com/2010/11/prime-number-generator-in-python-using.html
Read more

Convert text to ASCII and ASCII to text - Python code

Python has a very simple way to convert text to ASCII and ASCII to text. To find the ASCII value of a character use the ord() function. Example: >>> ord('B') 66 To get a character from it's ASCII value use the chr() function. Example: >>> chr(65) 'A' Here is a program to get the list of all characters along with their values: # program to print the list of characters and their ASCII values for value in range(0, 255): print "ASCII Value:", value, "\t", "Character:", chr(value), "\n" Here is another simple ASCII encoding-decoding program: # Convertion from text to ASCII codes message = raw_input("Enter message to encode: ") print "Decoded string (in ASCII):" for ch in message: print ord(ch), print "\n\n" # Convertion from ASCII codes to text message = raw_input("Enter ASCII codes: ") decodedMessage = "" for item in message.split(): decodedMessage += chr...
Read more