Does Python PIL resize maintain the aspect ratio?

Question

Does PIL resize to the exact dimensions I give it no matter what? Or will it try to keep the aspect ratio if I give it something like the Image.ANTIALIAS argume

Answer 1

Yes. the thumbnail() method is what is needed here... One thing that hasn't been mentioned in this or other posts on the topic is that 'size' must be either a list or tuple. So, to resize to a maximum dimension of 500 pixels, you would call: image.thumbnail((500,500), Image.ANTIALIAS)

See also this post on the subject: How do I resize an image using PIL and maintain its aspect ratio?

Answer 2

Yes it will keep aspect ratio using thumbnail method:

image = Image.open(source_path)
image.thumbnail(size, Image.ANTIALIAS)
image.save(dest_path, "JPEG")

Answer 3

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

Image.resize from PIL will do exactly as told. No behind scenes aspect ratio stuff.

Answer 4

No, it does not. But you can do something like the following:

im = PIL.Image.open("email.jpg"))
width, height = im.size
im = im.resize((width//2, height//2))

Here the height and width are divided by the same number, keeping the same aspect ratio.