Here's some code that fixes the rendering of this file:
try (PDDocument doc = Loader.loadPDF(new File("20251103 mail test2.pdf")))
{
PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm(null);
// avoids any fixup
PDResources dr = acroForm.getDefaultResources();
PDFont font = PDType0Font.load(doc, new
FileInputStream("SimSun-UNSECURE.ttf"), false); // source
https://fontzone.net/font-details/simsun
dr.put(COSName.getPDFName("SimSun"), font);
acroForm.refreshAppearances();
PDFRenderer r = new PDFRenderer(doc);
ImageIO.write(r.renderImageWithDPI(0, 300), "png", new
File("page1.png"));
ImageIO.write(r.renderImageWithDPI(6, 300), "png", new
File("page7.png"));
}
The font I have on windows is a ttc file so I can't embed it. I
downloaded a simsun.ttf file from a dubious source and used that to
replace the file in the default resources.
However saving this file brings a file that is now incorrectly displayed
in Adobe Reader.
That is of course only for this file. Not embedding fonts is always a
risk 😬
Tilman
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