[Okular-devel] how to get images from pdf files?

[Haidong Tang]

Albert,

Thanks a lot for clarifying! So is there any function that I can know the
positions of intrinsic images in a pdf? I just want to find a way to take
out those images. Do you have any suggestions?

Also, what is an OKULAR_OBSERVER_ID? I don't quite understand the mechanism
behind it. I used 6 in my case and it works fine but when I'm using 77 it
doesn't work at all. What number am I supposed to use?


> Message: 4
> Date: Thu, 07 Mar 2013 11:47:19 +0100
> From: Albert Astals Cid <aacid at kde.org>
> To: Okular development <okular-devel at kde.org>
> Subject: Re: [Okular-devel] how to get images from pdf files?
> Message-ID: <9667157.6NtSr88zM4 at xps>
> Content-Type: text/plain; charset="iso-8859-1"
>
> El Dijous, 7 de mar? de 2013, a les 00:12:10, Haidong Tang va escriure:
> > Hi,
>
> Hi
>
> > I'm testing some functionalities on Okular and currently I'm working on
> > getting images from a pdf files. I tried to use requestPixmaps( const
> > QLinkedList<PixmapRequest*> &requests ) in the class Document to request
> > image asynchronously and then use _o_nearestPixmap to get the images when
> > they are ready. However, the images I got by using this method are not
> > really what I want. This method may give me an image of the whole page,
> but
> > actually I'm only interested in those intrinsic images embedded in a
> page,
> > not a whole page converted into a image. Am I using the wrong function
> for
> > this task? Are there other more proper functions for my task? Thanks!
>
> There's no method that does what you want in the Okular API. You're
> welcome to
> draft the API for it if you need it and think the backends can implement
> it.
>
> Cheers,
>   Albert
>
>
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