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  1. PDFBox
  2. PDFBOX-3175

PDFTextStreamEngine probably miscalculates text height

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 2.0.0
    • 2.0.0
    • Text extraction
    • None
    • Patch

    Description

      When parsing a PDF document, TextPosition is created with constant text height, about 2 time smaller than character width, regardless of font size.
      The following workaround to calculate dyDisplay fixes the issue:

      float verticalScaling = 1/1000f;
      if (font instanceof PDType3Font)

      { Matrix fontMatrix = font.getFontMatrix(); verticalScaling = fontMatrix.getValue(1, 1); }

      float dyDisplay = bbox.getHeight() * fontSize * verticalScaling;

      Attachments

        1. MarketT_140815-1-marked-1.png
          509 kB
          Tilman Hausherr
        2. MarketT_140815-1-marked-1-18.png
          88 kB
          Tilman Hausherr
        3. PDFBOX-3175-reduced.pdf
          14 kB
          Tilman Hausherr
        4. snapshot.png
          100 kB
          Leo

        Issue Links

          relates to

          Sub-task - The sub-task of the issue PDFBOX-3062 Text extraction and height different in 2.0

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. PDFBOX-2508 Text extraction getting zero font height, bad widths, and ? for text in this PDF with Type 3 Fonts

          • Major - Major loss of function.
          • Closed

          Activity

            People

              tilman Tilman Hausherr
              ElEl Leo
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              Dates

                Created:
                Updated:
                Resolved: