Re: Transparent Text



On 27.02.2009 19:22:02 Duncan McGregor wrote:
> Thank you, I was beginning to come to that conclusion.
>
> I haven't tried SVG. Do you happen to know if text rendered by SVG
> rendered text would be searchable and selectable as text in the PDF?

As long as you don't use SVG filters, yes, that should be the case.

> In the meantime I have hit on the expedient solution of rendering the
> text underneath the image. It is still searchable and selectable
> there, but invisible.
>
> Thanks again
>
> Duncan
>
> On 27 Feb 2009, at 14:56, Jeremias Maerki wrote:
>
> > If I'm not mistaken, XSL-FO doesn't provide anything to do transparent
> > text. The only thing you can do is "white on white". For text with
> > transparency you'd have to look towards SVG with its opacity
> > attributes.
> > FOP/Batik can handle those but I haven't checked what exactly
> > happens if
> > you have an opacity of 0 (there's a risk that it might be "optimized"
> > away). It would be great if you could report back if that works once
> > you've tried it.
> >
> > On 27.02.2009 15:11:02 Duncan McGregor wrote:
> >> Thanks for the swift response Paul.
> >>
> >> I don't know if I explained this well. What I want is for the text's
> >> _foreground_ colour (hey, just realised you must be a Brit) to be
> >> fully transparent. That way it will not display when overlaid on the
> >> background image, but will still be searchable and selectable.
> >> Transparent block background seems to be the default, but I only seem
> >> to have 3 rgb channels of foreground
> >>
> >> <fo:block-container left='26.4px' position='absolute'
> >> top='252.48px'>
> >> <fo:block font-size='8.16px' color='rgb(255, 0, 0)'>
> >> subject to credit status. lf you are not accepted lor a
> >> credit
> >> account, you will not be entitled to claim your
> >> </fo:block>
> >> </fo:block-container>
> >>
> >> Cheers
> >>
> >> Duncan
> >>
> >>
> >> On 27 Feb 2009, at 12:16, paul womack wrote:
> >>
> >>> Duncan McGregor 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
> >>>
> >>> Text is set in the foreground colour, and has no background colour
> >>> per se.
> >>>
> >>> What might be loosely termed "opaque text" is merely text upon (and
> >>> in)
> >>> a coloured box (which has a colour, which we might term background
> >>> colour)
> >>>
> >>> If the text you wish to be "transparent" is in a box, it is the
> >>> box's
> >>> colour you need to suppress - so if you've been looking
> >>> in the text control parameters, you may well have missed it.



Jeremias Maerki


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