Python: How to resize an image using PIL module

Question

I'm trying to resize an image to 500x500px but got this error:

File "C:\Python27\lib\site-packages\PIL\Image.py", line 1681, in save
     save_handler = SAVE[format.upper()] KeyError: 'JPG'

This is the code:

from PIL import Image
img = Image.open('car.jpg')
new_img = img.resize((500,500))
new_img.save('car_resized','jpg')

try "JPEG" instead of "jpg" in your save function – Philip Feldmann Jun 04 '16 at 15:03 — Philip Feldmann, Jun 04 '16 at 15:03

Alan Kavanagh · Accepted Answer · 2016-06-04T15:27:35.780

31

You need to set the format parameter in your call to the save function to 'JPEG':

from PIL import Image
img = Image.open('car.jpg')
new_img = img.resize((500,500))
new_img.save("car_resized.jpg", "JPEG", optimize=True)

edited Jun 04 '16 at 15:27

answered Jun 04 '16 at 15:15

Alan Kavanagh

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Does it still retain the entire image? or will it crop? – Sundeep Pidugu Nov 25 '19 at 12:20
It will retain the entire image. Use `img.crop()` to crop – Alan Kavanagh Nov 25 '19 at 13:09

score 7 · Answer 2 · answered Nov 15 '18 at 10:57

7

Here is the solution:

from PIL import Image
img = Image.open('car.jpg')
new_img = img.resize((500,500), Image.ANTIALIAS)
quality_val = 90 ##you can vary it considering the tradeoff for quality vs performance
new_img.save("car_resized.jpg", "JPEG", quality=quality_val)

There are list of resampling techniques in PIL like ANTIALIAS, BICUBIC, BILINEAR and CUBIC. ANTIALIAS is considered best for scaling down.

answered Nov 15 '18 at 10:57

Om Sao

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Please take into consideration that ANTIALIAS is deprecated and will be removed from PIL in 2023 in favor of LANCZOS. – Ezequiel Adrian Sep 27 '22 at 21:57

Python: How to resize an image using PIL module

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