François Miermont wrote:
> The problem is that the text does not use the Alpha parameter for the 
> Color. I’d like to have the “Preview” to be in top of document, but with 
> transparency.

They do exist, iText developers who don't own "iText in Action" yet ;-)

Transparency is discussed in chapter 11 and you'll find some examples
here: http://www.1t3xt.info/examples/browse/?page=toc&id=16

But in chapter 14, you'll find an example that has exactly the code
snippets you are looking for:
http://www.1t3xt.info/examples/browse/?page=example&id=224

PdfGState gstate = new PdfGState();
gstate.setFillOpacity(0.3f);
gstate.setStrokeOpacity(0.3f);

PdfContentByte contentunder = writer.getDirectContentUnder();
contentunder.saveState();
contentunder.setGState(gstate);
contentunder.addImage(image, image.getWidth() * 4, 0, 0,
        image.getHeight() * 4, 120, 650);
contentunder.setColorFill(color);
contentunder.beginText();
contentunder.setFontAndSize(helv, 48);
contentunder.showTextAligned(Element.ALIGN_CENTER,
        "My Watermark Under " + writer.getPageNumber(),
        document.getPageSize().getWidth() / 2,
        document.getPageSize().getHeight() / 2, 45);
contentunder.endText();
contentunder.restoreState();

This example is different on 2 accounts:
1. getDirectContentUnder() is used, so the newly added content
    doesn't cover the existing content, it goes UNDER it.
2. The Graphics State is changed to transparent.

Experiment with the example and read the book for more info.
-- 
This answer is provided by 1T3XT BVBA

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