How to adjust the quality of a resized image in Python Imaging Library?

python python-imaging-library
bigmac picture bigmac · Sep 10, 2009 · Viewed 70k times · Source

I am working on PIL and need to know if the image quality can be adjusted while resizing or thumbnailing an image. From what I have known is the default quality is set to 85. Can this parameter be tweaked during resizing?

I am currently using the following code:

image = Image.open(filename)
image.thumbnail((x, y), img.ANTIALIAS)

The ANTIALIAS parameter presumably gives the best quality. I need to know if we can get more granularity on the quality option.

Answer

Dominic Rodger picture Dominic Rodger · Sep 10, 2009

Use PIL's resize method manually:

image = image.resize((x, y), Image.ANTIALIAS)  # LANCZOS as of Pillow 2.7

Followed by the save method

quality_val = 90
image.save(filename, 'JPEG', quality=quality_val)

Take a look at the source for models.py from Photologue to see how they do it.

Related questions

Installing PIL with pip

I am trying to install PIL (the Python Imaging Library) using the command: sudo pip install pil but I get the following message: Downloading/unpacking PIL You are installing a potentially insecure and unverifiable file. Future versions of pip will …

Read More
How do I resize an image using PIL and maintain its aspect ratio?

Is there an obvious way to do this that I'm missing? I'm just trying to make thumbnails.

Read More
ImportError: No module named PIL

I use this command in the shell to install PIL: easy_install PIL then I run python and type this: import PIL. But I get this error: Traceback (most recent call last): File "<console>", line 1, in <module&…

Read More