使用 python-pptx 提取自选图形的背景图像

Question

I am trying to extract all images from a PPTX file using python-pptx. I succeeded in doing this for images in shapes that have the picture style:

shape.shape_type == MSO_SHAPE_TYPE.PICTURE

but am struggling to extract images that have been added into the slide by setting them as the background image in an autoshape

shape.shape_type == MSO_SHAPE_TYPE.AUTO_SHAPE

Is there some way to extract the background image from an autoshape, or is this simply not possible through the API?

Answer 1

Unfortunately that's not currently possible via the API. You'd have to go to the underlying XML to get the element that looked like blipFill or similar and use the rId it has to get to the related image.

You can inspect the XML of the shape using:

print(shape._sp.xml)

Then you can use XPath to aquire the rId value:

rId = shape._sp.xpath({xpath expr to rId attr})[0]

Once you have the rId value you can acquire a reference to the ImagePart using:

image_part = slide.part.related_part(rId)

Once you have the image part I expect you know what to do, getting things like image_part.image : https://github.com/scanny/python-pptx/blob/master/pptx/parts/image.py#L21