Hi Michael,
I'm afraid support for optional content groups has not reached the stage
that they are checked when painting pages. You'll have to dive in and
add filtering for disabled OCGs.
As a starting point, see org.apache.pdfbox.pdfviewer.PageDrawer's
constructor which points you to the properties file that defines the
Operator implementations for PageDrawer. There, implementations for
BMC/BDC/EMC are missing. These will have to be implemented in a way that
painting operators are suppressed for a disabled OCG.
Jeremias Maerki
On 20.09.2012 14:43:41 Michael Karnerfors wrote:
>
>
> Hello all,
>
>
>
> I want to use PDFBox to load a PDF file, disable an Optional Content Group,
> and then use PDFImageWriter to output the resulting document to an image
> file.
>
>
>
> The problem is that the image writer does not seem to honor the fact I
> disabled the OCG and still outputs the layer.
>
>
>
> When I write the document as a new PDF file, Adobe Acrobat honors the fact I
> turned the OCG off.
>
>
>
> Does anyone know how you can make PDFImageWriter honor the disabled OCG?
>
>
>
> With best regards
>
> /Michael
>
>
>
> Code Sample:
>
>
>
> String password = "";
>
> String pdfFile = "input_file.pdf";
>
> String outputPrefix = "output_file";
>
> String imageFormat = "png";
>
> int startPage = 1;
>
> int endPage = Integer.MAX_VALUE;
>
> String color = "rgba";
>
> int resolution = 300;
>
>
>
> PDDocument document = null;
>
>
>
> try {
>
> document = PDDocument.load(pdfFile);
>
>
>
> PDDocumentCatalog catalog = document.getDocumentCatalog();
>
> PDOptionalContentProperties ocgs = catalog.getOCProperties();
>
>
>
> for(String groupName : ocgs.getGroupNames()) {
>
> if(groupName.startsWith("SmartMarks")) {
>
> ocgs.setGroupEnabled(groupName, false);
>
> }
>
> }
>
>
>
> PDFImageWriter imageWriter = new PDFImageWriter();
>
> imageWriter.writeImage(document, imageFormat, password, startPage, endPage,
> outputPrefix, imageType, resolution);
>
>
>
> } catch (Exception e) {
>
> System.err.println(e);
>
> } finally {
>
> if (document != null) { document.close(); }
>
> }
>
