Am 05.01.2019 um 21:30 schrieb Don Wills:
Hello,
I'm a newbie to PDFBox. It appears to be a very useful tool for what we're
trying to accomplish.
FWIW, in the past we have been building our own raw PDF files from scratch for
simple printed output from Java code. It was tedious, but with a minimal API
on top, it worked. Thus I have a bit of knowledge about the structure of a
PDF, but not much more.
I have noticed that when images, text and graphics are mixed in a single
PDPageContentStream in no particular order, it appears that the elements are
displayed and printed in layers. From my initial tests, it appears that
graphics (lines and filled polygons) are at the lowest layer, text is above the
graphics, and images are on top of graphics and text. Is that correct? Is
that a feature or an accident? Is that a feature of the PDF spec or PDFBox?
Is that behavior documented anywhere?
It depends on the order in the content stream. This can be chosen freely.
See the PDF specification...
I need to put a watermark on each page of a report. So for each page of the
report I create a PDPageContentStream, draw the watermark image on that content
stream, close it, and then create a second PDPageContentStream in APPEND mode
for the page that contains the text, graphics and images of the page. All
seems to work well. Is that the correct approach, or is there another better
method?
Yes that is one solution.
Another is to append and to use transparency.
Also, is there a place where I can search for answers to questions like this?
I'm sure this particular question has been answered before. I couldn't find
anything on StackOverflow and I have no idea how to search the archives of this
email list.
"pdfbox watermark" finds a few on stackoverflow.
Tilman
TIA.
Don Wills
Portable Software Company
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