Thank you
At present the text-behind-image trick is doing it for me, but when I
find its limitations I'll look into potentially patching fop.
Cheers
Duncan
On 2 Mar 2009, at 15:03, Jay Berkenbilt wrote:
Duncan McGregor <[email protected]> wrote:
Hi
I'm trying to work out how to write transparent text to overlay OCR
data on top of its source image.
I've seen it done in PDFs, but cannot find how to represent
transparency in xsl:fo
Thanks in anticipation
Duncan McGregor
To fill in a bit of missing information here, transparent text in PDFs
is not done by tweaking aspects of how the text is displayed, like
transparent text or white on white. It is a specific feature
supported by the PDF specification. Specifically, there is an
argument to the Tr (text rendering) operator. If you place
3 Tr
after your BT to begin a text stream, the resulting text will be
invisible. This is the correct way of putting "hidden text" in a PDF
for overlaying OCR data on top of an image.
I suppose the PDF output system in fop would have to specifically
support this.
Hope that helps...
--
Jay Berkenbilt <[email protected]>
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