Difficulty with PIL - TypeError: expected str, bytes or os.PathLike object, not Image

Question

我需要将裁剪后的图像作为流或 URL 传递给 Azure Computer Vision API。到目前为止，为了测试，我裁剪图像并将其存储在文件夹中并读取它。现在我需要直接读取裁剪后的图像，而不是将其实际存储在我的内存中。这是我当前的代码。

img = Image.open(path)
img2 = img.crop((bbox[-1][0], bbox[-1][1], bbox[-1][4], bbox[-1][5]))
            try:
                img2.save("C:/Repos/Dataset/Image_1/temp.jpg")
            except SystemError:
                #other code
            else:
                width, height = img2.size
                if (width >= 50 and height >= 50):
                    with open(img2, 'rb') as bg_image:
                        colour_analysis = computervision_client.analyze_image_in_stream(bg_image, remote_image_features)
                        bg_color = format(colour_analysis.color.dominant_color_background)
                        bgcol.append(bg_color)

我需要把它改成这样：

img = Image.open(path)
img2 = img.crop((bbox[-1][0], bbox[-1][1], bbox[-1][4], bbox[-1][5]))
                try:
                    width, height = img2.size
                    if (width >= 50 and height >= 50):
                        with open(img2, 'rb') as bg_image:
                            colour_analysis = computervision_client.analyze_image_in_stream(bg_image, remote_image_features)
                            bg_color = format(colour_analysis.color.dominant_color_background)
                            bgcol.append(bg_color)
                except: 
                    #some code

我在上面的代码中遇到了这个错误： with open(img2, 'rb') as bg_image: TypeError：应为 str、bytes 或 os.PathLike 对象，而不是 Image

如何将 Image 对象转换为流？

Answer 1

Image.open() 为您提供 pillow.Image 未压缩数据 - 每个像素都是单独的项目。但是 open() 需要文件名或访问具有字节数据的类文件对象（压缩为 jpg、png 等）。

您可以使用 io.BytesIO 在内存中创建类似文件的对象，将 pillow.image 保存到此文件（它将压缩它，即 png 或 jpg ) 然后用它来阅读。

import io

buffer = io.BytesIO()     # create file in memory
img2.save(buffer, 'jpeg') # save in file in memory - it has to be `jpeg`, not `jpg`
buffer.seek(0)            # move to the beginning of file

bg_image = buffer         # use it without `open()`

Difficulty with PIL - TypeError: expected str, bytes or os.PathLike object, not Image

Difficulty with PIL - TypeError: expected str, bytes or os.PathLike object, not Image

python

file

azure

python-imaging-library