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

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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.

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