[PDFBOX-5097] Rendered pdf image lacks all the text in this particular case

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Bug
• Affects Version/s: 2.0.22
• Component/s: Rendering
• Labels: jbig2
• Environment: Linux DamianPad 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
• Assignee: Unassigned
• Reporter: Robert-Andrei Damian
• Created: 04/Feb/21 09:49
• Updated: 04/Feb/21 18:25
• Resolved: 04/Feb/21 18:25

Description

Hello,

I am working with pdfbox to transform input pdf files to images, which are later fed to an OCR library. It works perfectly in most of the cases but I stumbled upon this particular case in which all text disappeared from the rendered image.

My source code for the method which converts the pdf into images:

 

public List<BufferedImage> splitPdf(File pdfFile) throws IOException {
    List<BufferedImage> result = new ArrayList<>();

    PDDocument document = PDDocument.load(pdfFile);
    PDFRenderer pdfRenderer = new PDFRenderer(document);
    for (int pageIndex = 0; pageIndex < document.getNumberOfPages(); pageIndex++) {
        result.add(pdfRenderer.renderImage(pageIndex));
        debugPageImageInfo(result.get(result.size() - 1));
    }
    document.close();

    return result;
}

 

I attached to this issue the pdf file for which I identified the problem and the resulting images.

 

I hope this is helpful for anyone else encountering the same problem!