如何在Django中调整图像大小并将其裁剪成正方形？

from PIL import Image
from django.core.files.base import ContentFile
from io import BytesIO

def resize_and_crop(image, size):
    # 打开图像并调整大小
    img = Image.open(image)
    img.thumbnail(size, Image.ANTIALIAS)

    # 创建一个正方形的画布
    new_image = Image.new('RGB', size, (255, 255, 255))
    new_image.paste(img, ((size[0] - img.size[0]) // 2, (size[1] - img.size[1]) // 2))

    # 将图像保存到内存中
    output = BytesIO()
    new_image.save(output, format='JPEG')
    output.seek(0)

    # 返回图像数据
    return ContentFile(output.getvalue())

from django.core.files.uploadedfile import InMemoryUploadedFile

def your_view(request):
    if request.method == 'POST':
        form = YourForm(request.POST, request.FILES)
        if form.is_valid():
            image = form.cleaned_data['image']
            resized_image = resize_and_crop(image, (300, 300))  # 调整大小为300x300

            # 创建一个新的InMemoryUploadedFile对象
            new_image = InMemoryUploadedFile(
                resized_image,
                None,
                image.name,
                image.content_type,
                resized_image.tell,
                None
            )

            # 保存新的图像到数据库或文件系统中
            # ...

            return HttpResponse('图像已调整大小并裁剪成正方形')
    else:
        form = YourForm()

    return render(request, 'your_template.html', {'form': form})