pdf source code：
src.zip (4.4 KB)
origin pdf:
盐田区发展和改革局关于支持加快推进盐田区综合能源补给设施建设工作的函.pdf.zip (84.3 KB)
converted problem:
before converted:
image.png (320.4 KB)
after converted:
image.jpg (204.9 KB)
It disappeared，please have a check.
I just tested a simple conversion from your PDF to PNG and the image is lost. I will create a ticket for the dev team.
@hucq_landray_com_cn
We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.
Issue ID(s): PDFNET-53784
You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.