Posts Tagged ‘scripting’

Because sometimes, you need some thumbnails

Sunday, March 20th, 2011

So let’s say you’ve got a folder with a load of images, and you want to display them as thumbnails.
One thing you certainly DON’T want to do is just load up the images and shrink them in the HTML – assuming that the images are large, this is a bandwidth hog, and an annoying experience for the user. Ideally, you’d want to use actual thumbnails – they’re smaller in terms of both filesize and dimensions.

I hacked together a little script to do this for me:

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#!/usr/local/bin/python2.6
 
import Image
import os
 
PICDIR = './pics'
THUMBDIR = '%s/thumbs' % PICDIR
ratio = 0.8
THUMB_W = 125
THUMB_H = int(ratio * THUMB_W)
THUMBSIZE = (THUMB_W, THUMB_H)
 
#1 - delete everything under /thumbs
all_thumbs = os.listdir(THUMBDIR)
remove_count = 0
for thumb in all_thumbs:
    thumbpath = '%s/%s' % (THUMBDIR, thumb)
    os.remove(thumbpath)
    print 'removed %s' % thumbpath
    remove_count += 1
print 'Removed %d thumbnails' % remove_count
 
#2 - for each image in the pic directory, generate a new thumbnail
all_files = os.listdir(PICDIR)
jpgs = [file for file in all_files if file.endswith('.jpg')]
 
for jpg in jpgs:
    original = Image.open('%s/%s' % (PICDIR, jpg))
    thumb = original.resize(THUMBSIZE, Image.ANTIALIAS)
    thumbpath = "%s/%s" % (THUMBDIR, jpg)
    thumb.save(thumbpath)
    print "wrote %s" % thumbpath

now whenever I rsync image files from my local machine to my webserver, I can just run the script, et voila!: thumbnails ahoy!

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Posted in programming | No Comments »

More Command line adventures

Friday, December 31st, 2010

Spent a little while over the last few days moving stuff between webservers, and I noticed that a few of my image files end in .jpg, and some end in .JPG.

This is unacceptable.

The following did the trick though.

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for fname in *.JPG
    do mv $fname `basename $fname .JPG`.jpg
done

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Posted in linux | No Comments »