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 How to assign a IEBitmap as background to every page of a PDF?

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BBriefs Posted - Jan 23 2025 : 08:33:12
Hello,

I am currently trying to implement a functionality that allows adding letter paper to an already existing PDF.

Technically this means that I want to select a picture of some kind and assign it as background to every page of the existing PDF.

I've had some difficulties achieving this with other PDF-components, such as all the layers being turned into one image thereby causing the PDF size to explode, which is why I would like to attempt this with Imageen but after experimenting around a bit I am not exactly sure how I should properly do this. Would I do some kind of canvas drawing with transparency or utilize layers maybe, or the PDFBuilder even though the PDF already exists?

I didn't find my exact problem in this forum or the demos, which is why I would be thankful if you could give me hint as to how this should be properly done with Imageen, or maybe I've overlooked something, which you could point me to.
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xequte Posted - Feb 13 2025 : 20:46:31
Here's a method to add a watermark image to a PDF page

procedure TfrmMain.AddWatermarkImage(WatermarkFilename: string);
begin
  // Load image into page at full size of the page
  obj := ImageEnView1.PdfViewer.Objects.AddImage( 0, 0, ImageEnView1.PdfViewer.PageWidth, ImageEnView1.PdfViewer.PageHeight, WatermarkFilename, False );

  // Send image behind all other images (it will be the last object)
  ImageEnView1.PdfViewer.Objects.ArrangeObject( obj, 0 );
end;


Nigel
Xequte Software
www.imageen.com
xequte Posted - Jan 23 2025 : 14:41:32
Hi

So the method to do with with ImageEn would be to use a PDFViewer (hidden or visible) to load the page, add an image to it and save the page.

Please see the demo:

\Demos\PDF\PDFPageObjects\PDFPageObjects.dpr
PDF Page Objects Demo EXE

But:
- PDFium does not provide a method to change the z-order of objects (and you would need the image to be behind all the other objects). Email us for a workaround method to do this
- Adding an image to every page of a PDF is definitely going to make it much larger

Nigel
Xequte Software
www.imageen.com