It seems you cannot get per file blobs without messing with c_types. So this is my solution
from path import path # wrapper for os.path
import re
import tempfile
image_pdf = Image(blob=pdf_blob)
image_jpeg = image_pdf.convert('jpeg')
temp_dir = path(tempfile.mkdtemp())
# set base file name (join)
image_jpeg.save(temp_dir / 'pdf_title.jpeg')
images = temp_dir.files()
sorted_images = sorted(
images,
key=lambda img_path: int(re.search(r'\d+', img_path.name).group())
)
for img in sorted_images:
with open(img, 'rb') as img_fd:
memory_file = SimpleUploadedFile(
img.name,
img_fd.read()
)
spam = Spam.objects.create(
page_image=memory_file,
caption="Spam Spam",
)
tempfile.rmtree(tempdir)
Not as clean as doing it all in memory, but it gets it done.