Hi Anton,
I suggest to not use the implementation of GetFilteredCopy but create a
similar implementation, which just applies all filters BUT the DCTDecode
filter. Should be a simple programming exercise .... e.g. just remove
DCTDecode from the list "vecFilters" ? Could work I guess ...
Cheers,
Dominik
On Wed, Aug 10, 2016 at 7:55 AM, Anton Heymann <
anton.heym...@cad-essence.com> wrote:
> Dominik
>
>
>
> I agree that this is a very strange case, but it certainly does exist. I
> have been looking at GetFilteredCopy exhaustively. It applies all filters
> as it uses CreateFilterList on the image object. How can I remove the Flate
> decode filter, but retain the DCT decode? The way I have 'something'
> working at the moment is to use GetFilteredCopy but then I end up with the
> whole image as a 'flat file' and I then need to start applying lots if
> rules to extract the image data to make it possible to display it as a
> bitmap. Any guidance on this process will also be appreciated. Need to use
> width, height, bitspersampe and possibly colourspace info then to get the
> raster data.
>
>
>
> Anton
>
>
>
> *From:* Dominik Seichter [mailto:domseich...@googlemail.com]
> *Sent:* 09 August 2016 18:34
> *To:* Anton Heymann <anton.heym...@cad-essence.com>
> *Cc:* podofo-users@lists.sourceforge.net
> *Subject:* Re: [Podofo-users] PDF Rendering - Multiple Filters on a Image
>
>
>
> Hi Anton,
>
>
>
> It is a bit strange that they did apply the flate decode and the DCT
> filter. Usually there is not much use in ZIP compressing a JPEG image ....
>
>
>
> Well, to your question: In this case you would have to apply the flate
> decode filter only (take a look on the implementation of
> PdfStream::GetFilteredCopy). You do not have to apply the DCTDecode filter,
> as DCTDecode just means JPEG compression. I.e. you can just store ther raw
> data of the stream as a file and you will get a JPEG file. This is exactly
> what ImageExtractor is doing.
>
>
>
> Best regards,
>
> Dominik
>
>
>
> On Tue, Aug 9, 2016 at 12:17 PM, Anton Heymann <
> anton.heym...@cad-essence.com> wrote:
>
> I need to import images from a PDF where the images have been encoded with
> multiple filters. The images are all DCTEncoded (JPEG) I use
>
>
>
> TVecFilters Filters = PdfFilterFactory::CreateFilterList(pRoot);
>
>
>
> To get a list of the filters on this image object. How do I extract the
> actual JPEG image, with the Filters set as follows
>
>
>
> ePdfFilter_FlateDecode
>
> ePdfFilter_DCTDecode
>
>
>
> Have been studing ImageExtractor::ExtractImage but cannot see how this is
> resolved.
>
> Thanks
>
>
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