Save tiff with transparency on disk

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   Hello!
I have a pdf that contains tiff with transparency.
I need to save to disk this picture in the form in which it lies in pdf, with transparency
Tell me how I can get tiff with transparency.
Now, when the image is saved, I get a bmp format file
Below is an example code. Tried with different pdf, the result is the same.
Is it possible to save tiff with transparency from page to disk
            int pC = qPdf.PageCount();
            for (int i = 1; i <= pC; i++)
            {
                qPdf.SelectPage(i);
                int il = qPdf.GetPageImageList(0);
                int ic = qPdf.GetImageListCount(il);
                for (int k = 1; k <= ic; k++)
                {
                    int it = qPdf.GetImageListItemIntProperty(il, k, 400);
                    int gid = qPdf.GetImageListItemIntProperty(il, k, 405);
                    switch (it)
                    {
                        case 1:
                            filename = "image-" + Convert.ToString(gid) + "-" + k + ".jpg";
                            break;
                        case 2:
                            filename = "image-" + Convert.ToString(gid) + "-" + k + ".bmp";
                            break;
                        case 3:
                            filename = "image-" + Convert.ToString(gid) + "-" + k + ".tif";
                            break;
                        case 4:
                            filename = "image-" + Convert.ToString(gid) + "-" + k + ".png";
                            break;
                    }
                qPdf.SaveImageListItemDataToFile(il, k, 0, "d:/xpdf/tet/" + filename);
Always .bmp (((


Edited by dezhavi - 24 Jan 18 at 10:14AM