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]

Re: Scaling pictures

Kajsa Anka wrote:

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.pn g"
outputfile = "picture_resize d.png"
new_size = "100x100"
os.system("conv ert %s -resize %s %s" % (filename, new_size, outputfile))

[Ravi Teja]

Re: Scaling pictures


Kajsa Anka wrote:

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/pi...book/image.htm

from PIL import Image
import glob, os

size = 128, 128

for infile in glob.glob("*.jp g"):
file, ext = os.path.splitex t(infile)
im = Image.open(infi le)
im.thumbnail(si ze, Image.ANTIALIAS )
im.save(file + ".thumbnail ", "JPEG")

[bearophileHUGS@lycos.com]

Re: Scaling pictures

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]

Re: Scaling pictures

On Thu, 28 Dec 2006 11:53:41 +0100, Kajsa Anka wrote
(in article <0001HW.C1B960C 5006E7E2DF04886 48@News.Individ ual.DE>):

Thanks for the answers, I'll use PIL.

jem

[cyberco]

Re: Scaling pictures

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.

On Dec 28, 2:32 pm, "Ravi Teja" <webravit...@gm ail.comwrote:

Kajsa Anka wrote:

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/pi...book/image.htm
>
from PIL import Image
import glob, os
>
size = 128, 128
>
for infile in glob.glob("*.jp g"):
file, ext = os.path.splitex t(infile)
im = Image.open(infi le)
im.thumbnail(si ze, Image.ANTIALIAS )
im.save(file + ".thumbnail ", "JPEG")

[cyberco]

Re: Scaling pictures

cyberco wrote:

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.j pg', quality=95)
=============== =============== ======

Now PIL is definitely the way to go. :)