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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