Adding TrimMark annotation to Page changes type to Unknown

Aspose.PDF Product Family
1

Hello,

I’m trying so check for TrimMarkAnnotations after they have been added to Page.
But after adding they are converted into “Unknown” type

Aspose PDF version 25.1

 AnnotationType checkAnnotation() {
    Document doc = new Document();
    doc.getPages().add();
    Page page = doc.getPages().get_Item(1);
    page.getAnnotations().add(new TrimMarkAnnotation(page, TopLeft));
    return page.getAnnotations().get_Item(1).getAnnotationType();
}
2

@dfinsolutions

Below is a sample code snippet to add Trim/Bleed/Registration Mark Annotations in a PDF document:

// 1. Add margins on each side of the page, so that marks will be visible
var editor = new Facades.PdfFileEditor();
editor.AddMargins(dataDir + "trimmarkannotation.pdf", "temp.pdf", new[] { 1 }, 36, 36, 36, 36);

using (var document = new Document("temp.pdf"))
{
    var page = document.Pages[1];
    var mediaBox = page.MediaBox;

    // 2. Set Page.TrimBox and Page.BleedBox not to include margins. The printer marks are placed between the MediaBox and these boxes
    page.TrimBox = new Rectangle(36, 36, mediaBox.URX - 36, mediaBox.URY - 36);
    // The BleedBox is usually slightly larger than the TrimBox
    page.BleedBox = new Rectangle(34, 34, mediaBox.URX - 34, mediaBox.URY - 34);

    // 3. Add trim mark in the corners of the TrimBox
    page.Annotations.Add(new TrimMarkAnnotation(page, PrinterMarkCornerPosition.TopLeft));
    page.Annotations.Add(new TrimMarkAnnotation(page, PrinterMarkCornerPosition.TopRight));
    page.Annotations.Add(new TrimMarkAnnotation(page, PrinterMarkCornerPosition.BottomLeft));
    page.Annotations.Add(new TrimMarkAnnotation(page, PrinterMarkCornerPosition.BottomRight));

    // 4. Add bleed marks in the corners of the bleed box
    page.Annotations.Add(new BleedMarkAnnotation(page, PrinterMarkCornerPosition.TopLeft));
    page.Annotations.Add(new BleedMarkAnnotation(page, PrinterMarkCornerPosition.TopRight));
    page.Annotations.Add(new BleedMarkAnnotation(page, PrinterMarkCornerPosition.BottomLeft));
    page.Annotations.Add(new BleedMarkAnnotation(page, PrinterMarkCornerPosition.BottomRight));

    // 5. Add color registration targets on all sides of the page
    page.Annotations.Add(new RegistrationMarkAnnotation(page, PrinterMarkSidePosition.Top));
    page.Annotations.Add(new RegistrationMarkAnnotation(page, PrinterMarkSidePosition.Bottom));
    page.Annotations.Add(new RegistrationMarkAnnotation(page, PrinterMarkSidePosition.Left));
    page.Annotations.Add(new RegistrationMarkAnnotation(page, PrinterMarkSidePosition.Right));

    // 6. Add the page information annotation in the bottom of the page, below the TrimBox
    var annotRectangle = new Rectangle(page.TrimBox.LLX, mediaBox.LLY, page.TrimBox.URX, page.TrimBox.LLY);
    page.Annotations.Add(new PageInformationAnnotation(page, annotRectangle));

    document.Save(dataDir + "output.pdf");
}

output.pdf (9.0 KB)

trimmarkannotation.pdf (1.8 KB)