Method call

tools/src/main/java/org/apache/pdfbox/tools/PDFToImage.java:120–207

()

    }

    public Integer call()
    {
        if (outputPrefix == null)
        {
            outputPrefix = FilenameUtils.removeExtension(infile.getAbsolutePath());
        }

        List<String> writerFormatNames = Arrays.asList(ImageIO.getWriterFormatNames());
        if (!writerFormatNames.contains(imageFormat))
        {
            String wfn = writerFormatNames.stream().collect(Collectors.joining(", "));
            SYSERR.println("Error: Invalid image format " + imageFormat + " - supported formats: " +
                    wfn);
            return 2;
        }

        if (quality < 0)
        {
            quality = "png".equals(imageFormat) ? 0f : 1f;
        }

        if (dpi == 0)
        {
            try
            {
                dpi = Toolkit.getDefaultToolkit().getScreenResolution();
            }
            catch (HeadlessException e)
            {
                dpi = 96;
            }
        }

        try (PDDocument document = Loader.loadPDF(infile, password))
        {
            PDAcroForm acroForm = document.getDocumentCatalog().getAcroForm();
            if (acroForm != null && acroForm.getNeedAppearances())
            {
                acroForm.refreshAppearances();
            }

            if (cropbox != null)
            {
                changeCropBox(document, cropbox[0], cropbox[1], cropbox[2], cropbox[3]);
            }

            long startTime = System.nanoTime();

            // render the pages
            if (page != -1)
            {
                startPage = page;
                endPage = page;
            }
            boolean success = true;
            endPage = Math.min(endPage, document.getNumberOfPages());
            PDFRenderer renderer = new PDFRenderer(document);
            renderer.setSubsamplingAllowed(subsampling);