[PDFBOX-4201] Certain scanned pdfs do not render

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 2.0.8
• Component/s: Parsing
• Assignee: Unassigned
• Reporter: Antonio Contreras
• Created: 19/Apr/18 20:44
• Updated: 18/May/18 13:06
• Resolved: 18/May/18 13:06

Description

I am using PDFBox version 2.0.8. I am trying to render scanned pdfs but there are a some that do not render and result in an error.  Native pdfs do not have any trouble rendering. The majority of the scanned pdfs that I have also do not have any trouble rendering but there are a couple that result in an error (one is attached).

This is the code I used to render the pdf.

try (PDDocument document = load(file)) {
    logger.debug("start generate image file " + pageNumber + " for " + name);
    PDFRenderer pdfRenderer = new PDFRenderer(document);
    return getPageImage(pdfRenderer, pageNumber, name, storageId);
}

The above call to getPageImage calls the following code 

File imageFile = File.createTempFile(StringUtils.toFilename(storageId) + "_" + pageNumber, ".png");
imageFile.deleteOnExit();

final BufferedImage image = pdfRenderer.renderImageWithDPI(pageNumber - 1, dpi, ImageType.RGB);
ImageIO.write(image, "png", imageFile);

logger.debug("completed generate image file " + pageNumber + " for " + name);
return imageFile;

The issue occurs in the second code snippet in the line

final BufferedImage image = pdfRenderer.renderImageWithDPI(pageNumber - 1, dpi, ImageType.RGB);

 

The stack trace is the following

Caused by: java.io.IOException: Error: Expected operator 'ID' actual='In'

at org.apache.pdfbox.pdfparser.PDFStreamParser.parseNextToken(PDFStreamParser.java:305) ~[pdfbox-2.0.8.jar:2.0.8]

at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:502) ~[pdfbox-2.0.8.jar:2.0.8]

at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:469) ~[pdfbox-2.0.8.jar:2.0.8]

at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:150) ~[pdfbox-2.0.8.jar:2.0.8]

at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:203) ~[pdfbox-2.0.8.jar:2.0.8]

at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:145) ~[pdfbox-2.0.8.jar:2.0.8]

at org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI(PDFRenderer.java:94) ~[pdfbox-2.0.8.jar:2.0.8]

at com.sustain.document.PdfPageGenerator.getPageImage(PdfPageGenerator.java:70) ~[classes/:?]

at com.sustain.document.PdfPageGenerator.getPageImage(PdfPageGenerator.java:59) ~[classes/:?]

Since rendering was not an issue with native pdfs I initially thought that only scanned pdfs were an issue. But after other scanned pdfs rendered, I am uncertain as to what could be causing some to render and some to error out.