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Read through almost all of the source code for repos that can parse images from .note files. For example: https://github.com/jya-dev/supernote-tool
My dad's project: https://github.com/nelinory/SupernoteSharp uses this approach to generate SGV files for each page or PDF files with vectorized content. Potrace is utilized for vectorization.
Do you want the point data of the handwriting or the whole picture?If you want to get point data, please see export.cpp void getPageData(...);If you want to get the image data of the layer, please see NoteView.cpp void NoteView::paint(QPainter *painter) unsigned char *data = load.loadImageData(...) Here is the link to the project (https://github.com/qiaodenghui/Supernote), if you want other version of the library I can compile it for you.