Python 带有 Django .thumbnail() 的枕头不符合我声明的尺寸

Question

我正在尝试使用 Pillow 调整图像大小，但它无法正常工作，我总是得到一个非常小的图像。我需要三种不同的尺寸，这就是我这样做的原因：

# Save Base64 Images
cover = Image.open(StringIO.StringIO((base64.b64decode(cover_image_64))))

cover_original = cover
cover_small = cover
cover_medium = cover

small_size = ProductCover.IMAGE_SIZES["small"]
medium_size = ProductCover.IMAGE_SIZES["medium"]

print(small_size)
print(medium_size)

# HERE-> 
cover_small.thumbnail(small_size, Image.ANTIALIAS)
cover_medium.thumbnail(medium_size, Image.ANTIALIAS)

original_image_file = StringIO.StringIO()
small_image_file = StringIO.StringIO()
medium_image_file = StringIO.StringIO()

cover_small.save(small_image_file, format="JPEG")
cover_medium.save(medium_image_file, format="JPEG")
cover_original.save(original_image_file, format="JPEG")

ProductCover.objects.create(product=product,
        original=InMemoryUploadedFile(original_image_file, None, "cover_original.jpg", 
        "image/jpeg", original_image_file.len, None),
        medium=InMemoryUploadedFile(medium_image_file, None, "cover_medium.jpg",
                                           "image/jpeg", medium_image_file.len, None),
        small=InMemoryUploadedFile(small_image_file, None, "small_small.jpg",
                                   "image/jpeg", small_image_file.len, None))

打印语句将此打印到控制台：

(60, 60)
(512, 512)

为什么我得到三张60*60的图片？

代码看起来如此直接和简单，以至于我完全迷失了。也许是 Django。我不知道。

Answer 1

您在此处将同一个对象引用分配给三个变量名称：

cover_original = cover
cover_small = cover
cover_medium = cover

因为所有三个都指向同一个对象，所以对其中任何一个调用 .thumbnail() 都会修改其他对象。尝试使用 Image.copy() 克隆图像：

cover_original = cover.copy()
cover_small = cover.copy()
cover_medium = cover.copy()

Python 带有 Django .thumbnail() 的枕头不符合我声明的尺寸

Python Pillow with Django .thumbnail() not respecting the sizes I declare

django

python-imaging-library

python-3.x