PIL: Thumbnail and end up with a square image

Question

Calling

image = Image.open(data)
image.thumbnail((36,36), Image.NEAREST)

will maintain the aspect ratio. But I need to end up displaying the image like this:

<img src="/media/image.png" style="height:36px; width:36px" />

Can I have a letterbox style with either transparent or white around the image?

Solution 1

Paste the image into a transparent image with the right size as a background

from PIL import Image
size = (36, 36)
image = Image.open(data)
image.thumbnail(size, Image.ANTIALIAS)
background = Image.new('RGBA', size, (255, 255, 255, 0))
background.paste(
    image, (int((size[0] - image.size[0]) / 2), int((size[1] - image.size[1]) / 2))
)
background.save("output.png")

EDIT: fixed syntax error

Solution 2

PIL already has a function to do exactly that:

from PIL import Image, ImageOps
thumb = ImageOps.fit(image, size, Image.ANTIALIAS)

Solution 3

from PIL import Image

import StringIO

def thumbnail_image():
    image = Image.open("image.png")
    image.thumbnail((300, 200))
    thumb_buffer = StringIO.StringIO()
    image.save(thumb_buffer, format=image.format)
    fp = open("thumbnail.png", "w")
    fp.write(thumb_buffer.getvalue())
    fp.close()

Solution 4

Update of Cesar Canassa's answer.

This will create a thumbnail of image.jpg as image_thumb.jpg:

from PIL import Image, ImageOps
fname = 'image.jpg'
size = (48,48)
thumb = ImageOps.fit(Image.open(fname), size, Image.ANTIALIAS)
thumb.save('{}_thumb.jpg'.format(fname[:fname.rfind('.')]), "JPEG")

Solution 5

Why not simply use the resize method ?

from PIL import Image
image = Image.open('/path/to/img.png')
image = image.resize((36,36), Image.ANTIALIAS)

See recommendations for image resizing in this release note: https://pillow.readthedocs.io/en/stable/releasenotes/5.3.0.html

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