How to resize an image using PIL and maintain its aspect ratio with Python?

Sometimes, we want to resize an image using PIL and maintain its aspect ratio with Python.

In this article, we’ll look at how to resize an image using PIL and maintain its aspect ratio with Python.

How to resize an image using PIL and maintain its aspect ratio with Python?

To resize an image using PIL and maintain its aspect ratio with Python, we can open the image with Image.open.

Then we calculate the new width and height to scale the image to according to the new width.

And then we resize the image with the resize method and save the new image with the save method.

For instance, we write:

from PIL import Image

basewidth = 300
img = Image.open('test1.png')
wpercent = (basewidth / float(img.size[0]))
hsize = int((float(img.size[1]) * float(wpercent)))
img = img.resize((basewidth, hsize), Image.ANTIALIAS)
img.save('somepic.png')

We set the new width with:

basewidth = 300

Then we open the image with:

img = Image.open('test1.png')

Next, we compute the scale factor with:

wpercent = (basewidth / float(img.size[0]))

Then we get the height of the image with:

hsize = int((float(img.size[1]) * float(wpercent)))

Next, we write:

img = img.resize((basewidth, hsize), Image.ANTIALIAS)

to resize the image.

We use Image.ANTIALIAS to apply image anti-aliasing while resizing.

And finally, we call image.save with the file path to save to to save the resized image.

Conclusion

To resize an image using PIL and maintain its aspect ratio with Python, we can open the image with Image.open.

Then we calculate the new width and height to scale the image to according to the new width.

And then we resize the image with the resize method and save the new image with the save method.