Images with transparency mask are not correctly extracted

[pubpub-zz]

When an image is extracted

from pypdf import PdfReader, PdfWriter
from pypdf.generic import NameObject, NullObject
from PIL import Image
from io import BytesIO

w = PdfWriter()
w.append("resources/labeled-edges-center-image.pdf")

for p in w.pages:
    for image_file_object in p.images:
        print(image_file_object.name)
        ii = Image.open(BytesIO(image_file_object.data))
        b = BytesIO()
        ii.save(b, "pdf", quality=60, resolution=19.0, optimize=True)
        rrr = PdfReader(b)
        n = NameObject("/" + "".join(image_file_object.name.split(".")[:-1]))
        ind = p["/Resources"]["/XObject"].raw_get(n)
        w._objects[ind.idnum] = NullObject()  # to cleanup file
        p["/Resources"]["/XObject"][n] = (
            rrr.pages[0]["/Resources"]["/XObject"]["/image"].clone(w).indirect_reference
        )
w.write("tt.pdf")

edit : code updated

Originally posted by @pubpub-zz in #1546 (comment)

[pubpub-zz]

this issue will require update of PIL

[pubpub-zz]

PIL 2.5.0 is planned for beginning of april:
python-pillow/Pillow#6989
😀

[radarhere]

For clarity - it is Pillow 9.5.0 that will be released at the beginning of April. Pillow 2.5.0 was released a long time ago.