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]> --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
