在django模型中保存来自单个ImageField的不同尺寸的多个图像

pip install pillow

from django.db import models

class MyModel(models.Model):
    image = models.ImageField(upload_to='images/')

from django.db.models.signals import post_save
from django.dispatch import receiver
from PIL import Image

@receiver(post_save, sender=MyModel)
def generate_thumbnail(sender, instance, **kwargs):
    image = Image.open(instance.image.path)
    
    # 缩放图像
    thumbnail_size = (100, 100)
    thumbnail = image.resize(thumbnail_size)
    thumbnail_path = f'{instance.image.path}_thumbnail.jpg'
    thumbnail.save(thumbnail_path)
    
    # 裁剪图像
    crop_size = (200, 200)
    crop = image.crop((0, 0, crop_size[0], crop_size[1]))
    crop_path = f'{instance.image.path}_crop.jpg'
    crop.save(crop_path)

post_save.connect(generate_thumbnail, sender=MyModel)