PNG Files to TIFF getting converted to Blank

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   Hi ,I am currently using the DebenuPDFLibraryDLL1011 in my C# application using VS 2017 with .net framework - 4.6.1

I am trying to convert the .png files to tiff  using the Method = "RenderDocumentToFile"
and "  
byte[] bytesPageBitmap = PL.RenderPageToString(renderDPI, intPageIndex, 0);"

but desired output file results into the blank image when I try to saveas a ".tif  image format"

Code -
 PDFLibrary PL = new PDFLibrary(strDLLPath);

                if (PL.LibraryLoaded())
                {
                    PL.UnlockKey(PdfTask.DebenuPDFLibraryUnlockKey);
                    var strFileName = @"D:\png files\1.png";
                    PL.LoadFromFile(strFileName, string.Empty);
                    const float renderDPI = 180;

                    int intPageCount = PL.PageCount();

                    for (int intPageIndex = 1; intPageIndex <= intPageCount; intPageIndex++)
                    {
                        // PDF to bitmap
                        int i = PL.RenderDocumentToFile(renderDPI, intPageIndex, 0, 7, @"D:\my.tiff");
                    }
                }


Edited by rocky1 - 22 Jan 20 at 8:30AM

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rocky1 Members Profile Find Members Posts Beginner Joined: 22 Jan 20 Status: Offline Points: 11	Post Options Post Reply Quote rocky1 Report Post Thanks(0) Quote Reply Topic: PNG Files to TIFF getting converted to Blank Posted: 22 Jan 20 at 8:29AM
	Hi , I am currently using the DebenuPDFLibraryDLL1011 in my C# application using VS 2017 with .net framework - 4.6.1 I am trying to convert the .png files to tiff using the Method = "RenderDocumentToFile" and " byte[] bytesPageBitmap = PL.RenderPageToString(renderDPI, intPageIndex, 0);" but desired output file results into the blank image when I try to saveas a ".tif image format" Code - PDFLibrary PL = new PDFLibrary(strDLLPath); if (PL.LibraryLoaded()) { PL.UnlockKey(PdfTask.DebenuPDFLibraryUnlockKey); var strFileName = @"D:\png files\1.png"; PL.LoadFromFile(strFileName, string.Empty); const float renderDPI = 180; int intPageCount = PL.PageCount(); for (int intPageIndex = 1; intPageIndex <= intPageCount; intPageIndex++) { // PDF to bitmap int i = PL.RenderDocumentToFile(renderDPI, intPageIndex, 0, 7, @"D:\my.tiff"); } } Edited by rocky1 - 22 Jan 20 at 8:30AM

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(1) Quote Reply Posted: 22 Jan 20 at 11:11AM
	Hi Rocky, please keep in mind that it's a pdf-library you're working with ;-) You can render a pdf-page to an image format or you can render an image to a pdf-page... But you can't render one image type to another image type with this library. If you want this with QuickPDF you have to make two steps: png to pdf ... and then pdf to tiff. Cheers and welcome here, Ingo
	Cheers, Ingo

rocky1 Members Profile Find Members Posts Beginner Joined: 22 Jan 20 Status: Offline Points: 11	Post Options Post Reply Quote rocky1 Report Post Thanks(0) Quote Reply Posted: 22 Jan 20 at 2:33PM
	Oh Thank you Ingo for the update on this