Scaling pictures

[Kajsa Anka]

I would like some advice, I'm going to build a small app that will, among
other things, scale images so that they can be published on a web site. I've
never done any image processing in python before so I would like to ask what
is the best way of doing this, I will not do anything else than scaling the
images.

I found the Python Imaging Library but before I dive into that I would like
to know if there is a better way of doing this.

 

[buffi]

I would like some advice, I'm going to build a small app that will, among
other things, scale images so that they can be published on a web site. I've
never done any image processing in python before so I would like to ask what
is the best way of doing this, I will not do anything else than scaling the
images.

I found the Python Imaging Library but before I dive into that I would like
to know if there is a better way of doing this.

I prefer using imagemagick whenever I have to do anything related to
images.
http://www.imagemagick.org/script/index.php

Resizing an image would be something like this

import os

filename = "picture.png"
outputfile = "picture_resized.png"
new_size = "100x100"
os.system("convert %s -resize %s %s" % (filename, new_size, outputfile))

 

[Ravi Teja]

I would like some advice, I'm going to build a small app that will, among
other things, scale images so that they can be published on a web site. I've
never done any image processing in python before so I would like to ask what
is the best way of doing this, I will not do anything else than scaling the
images.

I found the Python Imaging Library but before I dive into that I would like
to know if there is a better way of doing this.

Yes. Python Imaging Library (PIL) is the preferred Python way to do
this. The example is right in the documentation.
http://www.pythonware.com/library/pil/handbook/image.htm

from PIL import Image
import glob, os

size = 128, 128

for infile in glob.glob("*.jpg"):
file, ext = os.path.splitext(infile)
im = Image.open(infile)
im.thumbnail(size, Image.ANTIALIAS)
im.save(file + ".thumbnail", "JPEG")

 

[bearophileHUGS]

Kajsa Anka:

I found the Python Imaging Library but before I dive into that I would like
to know if there is a better way of doing this.

PIL is very fit for that. Note that it creates thumbnails already by
itself, you can use that for bigger images too.

Bye,
bearophile

 

[Kajsa Anka]

Thanks for the answers, I'll use PIL.

jem

 

[cyberco]

PIL is certainly a fine option, but I noticed that the scaled images
(scaled with the ANTIALIAS filter) are not as good as you can get with,
say, Photoshop. Maybe I'm just expecting too much, but I wish I could
choose a higher quality rescaling algorithm. PIL still rocks though.

 

[cyberco]

PIL is certainly a fine option, but I noticed that the scaled images
(scaled with the ANTIALIAS filter) are not as good as you can get with,
say, Photoshop. Maybe I'm just expecting too much, but I wish I could
choose a higher quality rescaling algorithm. PIL still rocks though.

Sorry, I should have checked the facts a little better: you can set the
quality of the compression when saving:

====================================
img = Image.open('old.jpg')
img.thumbnail((640,480), Image.ANTIALIAS)
img.save('new.jpg', quality=95)
====================================

Now PIL is definitely the way to go.