pdf - itextsharp 5.4.4 - GetDrawingImage decodes this image the wong way - why? -


this pdf displayed on firefox in c# program wrote using itextsharp 5.4.4, used getdrawingimage method of pdfimageobject , grabled image.

i used itextsharp in following way:

pdfreader reader = new pdfreader(filename); pdfreadercontentparser parser = new pdfreadercontentparser(reader); imagerenderlistener listener = new imagerenderlistener(); parser.processcontent(pagenumber, listener);

where imagerenderlistener irenderlistener, implements renderimage method in following way:

    public void renderimage(imagerenderinfo renderinfo)     {         pdfimageobject image = renderinfo.getimage();          pdfobject obj = image.get(pdfname.filter);          pdfname filter = null;          if (obj pdfname)         {             filter = (pdfname)obj;         }         else if (obj pdfarray)         {             foreach(var o in (pdfarray)obj)             {                 if (o pdfname)                 {                     filter = o pdfname;                     break;                 }             }         }          if (filter != null)         {             system.drawing.image drawingimage = image.getdrawingimage(); ... ... ...         }

the drawing image stored in listener , drawn screen etc...

i tried understand this, filter /ccittfaxdecode streamcontenttype somehow png, enlighten me on matter?

thanx in advance.

the reason problem explained in following video: ripping pdf files apart. if don't want sit through complete video, fast forward minute 24 , watch onto minute 27. note conclusion on minute 27: in general, there no images in pdf. (that's exaggerated, if understand 3 minutes of explanation, understand mark stephens means.)

if want details why ccittfaxdecode changed png, please read chapter 10 of my book.


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