how could I use acrobat SDK plug-ins add image，thanks
Understand image file format and PDF internal file format. Read and convert image file. Create PDEImage. Use PDFEdit API to add image.
do you have any code example? thanks very much
Download and install the SDK. There are lots of examples.
If you are new to the PDF format then you have a lot to learn. Start by reading through the PDF specification.
There will be a lot of study.