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Python Code Snippet
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Create Image Thumbnails (Python)

by vegaseat on Feb 25th, 2005

One more application of the Python Image Library (PIL). This short code creates thumbnails from all JPEG files in the current folder. The thumbnail image file is prefixed with a T_ and saved to the same directory. The program checks for existing files with this prefix, so we don't create T_T_ prefix files and so on.

Last edited by vegaseat; Feb 10th, 2010 at 3:02 pm. Reason: nice suggestion by fernandooa

Python Code Snippet (Toggle Plain Text)

# experiments with the Python Image Library (PIL)
# free from:  http://www.pythonware.com/products/pil/index.htm
# create 128x128 (max size) thumbnails of all JPEG images in the working folder
# Python23 tested    vegaseat    25feb2005
# fernandooa modified
 
import glob
import Image
 
# get all the jpg files from the current folder
for infile in glob.glob("*.jpg"):
  im = Image.open(infile)
  # don't save if thumbnail already exists
  if infile[0:2] != "T_":
    # convert to thumbnail image
    im.thumbnail((128, 128), Image.ANTIALIAS)
    # prefix thumbnail file with T_
    im.save("T_" + infile, "JPEG")

Comments on this Code Snippet

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Mar 20th, 2005

Re: Create Image Thumbnails (Python)

At this point PIL is only available for Python v2.3, sorry! I hope this will change soon.

vegaseat

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since Oct 2004

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May 20th, 2005

Re: Create Image Thumbnails (Python)

The Python Image Library (PIL) is now available for Python24.
Download and instal
PIL-1.1.5.win32-py2.4.exe [533k]
from
http://effbot.org/downloads/#imaging

vegaseat

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Nov 21st, 2008

Re: Create Image Thumbnails (Python)

Hello.

Excuse me, I'm really new to python (currently learning the library), and I found your blog by looking for a way for creating thumbnails.

Thanks a million for your snippet, just a question (as I'm so new I might have missed something), wouldnt your snippet be more efficient if it were like this? (well, only in case the folder contained any thumnails)

python Syntax (Toggle Plain Text)
import glob
import Image
 
# get all the jpg files from the current folder
for infile in glob.glob("*.jpg"):
 
    if infile[0:2] == "T_":
        continue # Skipping a thumbnail
 
    im = Image.open(infile)
 
# convert to thumbnail image
    im.thumbnail((128, 128), Image.ANTIALIAS)
    im.save("T_" + infile, "JPEG")
import glob
import Image

# get all the jpg files from the current folder
for infile in glob.glob("*.jpg"):

    if infile[0:2] == "T_":
        continue # Skipping a thumbnail

    im = Image.open(infile)

# convert to thumbnail image
    im.thumbnail((128, 128), Image.ANTIALIAS)
    im.save("T_" + infile, "JPEG")

fernandooa

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since Nov 2008

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Feb 10th, 2010

Re: Create Image Thumbnails (Python)

Of course it would be more efficient. But on the internet you get what you pay for (i.e. a random blog with a random utility, that might not be written too well).

sillyman

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since Feb 2010

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Feb 10th, 2010

Re: Create Image Thumbnails (Python)

So, according to member sillyman, if you pay nothing you get nothing!

I have news for you, I have paid good money plenty of times and still got nothing!

vegaseat

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Jun 27th, 2011

Re: Create Image Thumbnails (Python)

Further tweakage:

python Syntax (Toggle Plain Text)
def ThumbnailDir(dir):
  import glob
  import Image
 
 
  if not isinstance(dir,type("")): dir="" #i.e. use current directory instead.
  #Optimally, this would raise a type error,
  #but I just ain't fighting with that today.
 
# get all the jpg files from the selected directory
  for infile in glob.glob(dir+"*.jpg"):
 
    filename=infile[(infile.rfind("\\")+1):] #Parse escaped string ala "C:\\directory\\subdirectory\\whatever\\"
    #Obviously, switching to "/" would confound this logic.
    if infile[0:2] == "T_":
        continue # Skipping a thumbnail
    try:
     im = Image.open(infile)
 
# convert to thumbnail image
     im.thumbnail((128, 128), Image.ANTIALIAS)
     im.save(dir + "T_" + filename, "JPEG")
    except IOError:
     #skip the file and continue
     im=None
def ThumbnailDir(dir):
  import glob
  import Image


  if not isinstance(dir,type("")): dir="" #i.e. use current directory instead.
  #Optimally, this would raise a type error,
  #but I just ain't fighting with that today.

# get all the jpg files from the selected directory
  for infile in glob.glob(dir+"*.jpg"):

    filename=infile[(infile.rfind("\\")+1):] #Parse escaped string ala "C:\\directory\\subdirectory\\whatever\\"
    #Obviously, switching to "/" would confound this logic.
    if infile[0:2] == "T_":
        continue # Skipping a thumbnail
    try:
     im = Image.open(infile)

# convert to thumbnail image
     im.thumbnail((128, 128), Image.ANTIALIAS)
     im.save(dir + "T_" + filename, "JPEG")
    except IOError:
     #skip the file and continue
     im=None

Still needs work, but this did the job I needed done.

thenate

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since Jun 2011

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