Python：如何使用 PIL 模块调整图像大小
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Python: How to resize an image using PIL module
提问by Doromi
I'm trying to resize an image to 500x500px but got this error:
我正在尝试将图像大小调整为 500x500 像素，但出现此错误：
File "C:\Python27\lib\site-packages\PIL\Image.py", line 1681, in save
save_handler = SAVE[format.upper()] KeyError: 'JPG'
This is the code:
这是代码：
from PIL import Image
img = Image.open('car.jpg')
new_img = img.resize((500,500))
new_img.save('car_resized','jpg')
回答by AK47
You need to set the format parameter in your call to the save function to 'JPEG':
您需要在调用 save 函数时将格式参数设置为“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)
回答by Om Sao
Here is the solution:
这是解决方案：
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, BILINEARand CUBIC.
ANTIALIASis considered best for scaling down.
有PIL中重采样技术，如清单ANTIALIAS，BICUBIC，BILINEAR和CUBIC。
ANTIALIAS被认为是缩小规模的最佳选择。
