Hi Leonard,
Yes, this is it exactly.
Ok, so now that we know podofo has the capabilities, we'll work on stripping
out poppler and replacing it with podofo in our codebase. Our team was
really happy to have found this (and also a bit sad after having spent
significant time on their own implementation).
Thank you for your help. We really appreciate it.
Matt
On Sun, Apr 24, 2011 at 3:24 PM, Leonard Rosenthol <[email protected]>wrote:
> Exactly as I figured – which is why I wanted to see the PDFs.
>
>
>
> Whatever software is producing the PDF is drawing a filled white opaque
> rectangle the size of the paper/page as the first thing it does. Here’s the
> start of the content stream (bold & red are mine for emphasis) of
> Note-14-49:
>
> q
>
> *1 1 1 rg /Gs1 gs*
>
> *0 792 612 -792 re f*
>
> 0.2 0.2 0.8 RG 0.85 w
>
> 1 J
>
> 1 j
>
> [] 0.0 d
>
> 10 M 188.625 705.937 m 188.625 706.652 l 187.906 706.652 l 187.191 707.371
> l
>
>
>
> So what you need to do is get the original authoring software (which
> appears to be using Cairo) to stop that – and just write out the S’s. I
> manually removed them from out-merge and enclosed the result.
>
>
>
> Leonard
>
>
>
> *From:* Matthew Chan [mailto:[email protected]]
> *Sent:* Sunday, April 24, 2011 3:00 PM
> *To:* Leonard Rosenthol
> *Cc:* [email protected]
> *Subject:* Re: [Podofo-users] transparent overlap of PDF
>
>
>
> Hi Leonard,
>
> Thanks for your reply.
>
> I might have been a bit vague in my original email. Sorry about that. My
> collaborator had a better example to explain:
>
> " suppose you print a PDF onto a sheet of paper. Now print a second PDF on
> the same sheet of paper. "
>
> That's the functionality I was trying to describe last time. Right now,
> we're stripping all the strokes off the second PDF and adding them back onto
> the first, but it's forcing us to use the mangled poppler implementation.
>
> Here are the PDFs we are trying to superimpose.
>
> 2011-04-24-Note-14-48.pdf and 2011-04-24-Note-14-49.pdf are the source
> images.
> out_merge.pdf is the podofoimpose result
> 2011-04-24-Note-14-48.xoj.pdf is what we are hoping to get. (yes, we're
> working on the xournal project =) )
>
> We plan to call the podofo libs to integrate it into our project. It's ok
> if podofoimpose doesn't have the functionality, as long as the libs do.
>
> Thanks for your time,
> Matt
>
> On Sun, Apr 24, 2011 at 9:18 AM, Leonard Rosenthol <[email protected]>
> wrote:
>
> Transparency is maintained at the page/graphics level. Any two pages
> composited together will maintain their transaparency.
>
>
>
> Can you post two source PDFs and the result from podofoimpose that
> demonstrate the problem you are seeing?
>
>
>
> Thanks,
>
> Leonard
>
>
>
> *From:* Matthew Chan [mailto:[email protected]]
> *Sent:* Saturday, April 23, 2011 8:18 PM
> *To:* [email protected]
> *Subject:* [Podofo-users] transparent overlap of PDF
>
>
>
> Hi,
>
> I'm evaluating the Podofo libs for use in a project to replace a mangled
> poppler implementation (we used poppler to make edits and write PDFs).
>
> One of the key things we're trying to do is replace our own implementation
> of a PDF overlay function. Our function takes two PDF documents and overlays
> it, while maintaining transparency of the PDFs.
>
> I was wondering if there was any feature that was capable of transparently
> overlaying two PDFs in the Podofo libs? I saw the podofoimpose tool, but it
> doesn't retain PDF transparency.
>
> Thanks in advance for your replies,
> Matt
>
>
>
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