Comment 3 for bug 518732

I linked a branch (lp:~osomon/pyexiv2/from_buffer) that implements instantiating an ImageMetadata from a buffer, and exposing the image data as a buffer. This also allows to easily instantiate an ImageMetadata from a file-like object, using the following syntax:

    m = ImageMetadata.from_buffer(f.read())

@Mark and others, your feedback and comments on this approach are welcome, if it suits your needs I'll merge it.