ExportAsImage doesn't work with DPI Settings

[Haikal Khair]

I Have a problem with exporting a PDF to an Image when i set the DPI:

      public static Bitmap ConvertPdfToBitmap(string filepath, int dpi)
        {

            Bitmap bmp = null;

            PdfViewerControl loadedDocument = new PdfViewerControl();
            loadedDocument.Load(filepath);
            bmp = loadedDocument.ExportAsImage(0);
            bmp = loadedDocument.ExportAsImage(0, bmp.HorizontalResolution *2, bmp.VerticalResolution*2) ;

            return bmp;
        }

When i use the DPI settings, the image DPI gets higher but the image itself is nto stretched. White space is added around it, even when I put in an integer like 300,300 it is the same thing.

Is this a bug or am i doing something wrong?

Attachment: 20190117_19_40_31_665a0895.rar

[Karthik Krishnaraj]

Hi Haikal, 

 

Greetings from Syncfusion, 

 

When i use the DPI settings, the image DPI gets higher but the image itself is nto stretched. White space is added around it

We were unable to reproduce the issue with “White space added around the exported image”. I have attached a simple sample for your reference below. Can you please modify the sample to replicate the issue? It will be helpful for us to analyze further and provide better solution.

the image itself is nto stretched

DPI value is meant to increase the quality of the image. If you want to increase width and height of the image, you can specify the custom size to the image while exporting the PDF document using PDF viewer. Please find the below code snippet.    BitmapSource[] bitmapSource = pdfViewer.ExportAsImage(startIndex, endIndex, new SizeF(900, 900), 300, 300, true);        API reference link:  https://help.syncfusion.com/cr/wpf/Syncfusion.Windows.PdfViewer.PdfViewerControl.html#Syncfusion_Windows_PdfViewer_PdfViewerControl_ExportAsImage_System_Int32_System_Int32_System_Drawing_SizeF_System_Single_System_Single_System_Boolean_    We can also export the specific pages of the PDF document as Bitmap sources with respect to DPI. Please find the API reference link below.  https://help.syncfusion.com/cr/wpf/Syncfusion.Windows.PdfViewer.PdfViewerControl.html#Syncfusion_Windows_PdfViewer_PdfViewerControl_ExportAsImage_System_Int32_System_Int32_System_Single_System_Single_    We have prepared sample illustrating both the scenario. Kindly try running the sample and let us know whether it helps you.

 

Sample link: 

http://www.syncfusion.com/downloads/support/forum/142082/ze/ExportAsImage-1577242900.zip 

 

Regards, 

Karthik.