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Adding background image renders grainy and choppy
https://forum.pdfsharp.net/viewtopic.php?f=2&t=2614		 Page 1 of 1
Author:  DaveRook [ Wed Oct 16, 2013 11:25 am ]
Post subject:  Adding background image renders grainy and choppy
I'm having some issues with creating PDF's, which I suspect is my own fault! :)

I am trying to create a PDF with a background image. That is it.

This is from a Project (Visual Studio 2012) although it's a website.

public static string CreateTest()
{
try
{
string directory = @"C:\Users\Dave\Documents\Visual Studio 2012\Projects\Website\LifeCry\LifeCry\Content\Poster\";

PdfDocument document = new PdfDocument();
PdfPage page = document.AddPage();
document.Options.NoCompression = true;
document.Options.ColorMode = PdfColorMode.Cmyk;
document.Version = 14;
page.Size = PdfSharp.PageSize.A4;

XImage xImagePosterBackground = XImage.FromFile(directory + "LifeCryPosterA4.jpg");

XGraphics graphics = XGraphics.FromPdfPage(page);

graphics.DrawImage(xImagePosterBackground, new XPoint(0, 0));

string fileName = DateTime.Now.ToString("yyMMddhhmmss") + ".pdf";

document.Save(directory + fileName);

return "../Content/Poster/" + fileName;
}
catch (System.Exception ex)
{
string s = ex.ToString();
System.Diagnostics.Debug.Assert(false, "beep beep, it failed!");
//TODO - impelement me (yeah, what ever)
}
}

The issue is the page exports/renders incorrectly in anything but FireFox. This means, in IE, Chrome, PDX-XChange and PhotoShop, it renders incorrectly. See attached for screen shots of how it renders and how it should be.

Here, I hope, you can see the issue.

Is this a fault with my code? Any advice would be appreciated.

Dave

Attachments:
File comment: HowItShouldBe
howItShouldBe.gif
howItShouldBe.gif [ 46.02 KiB | Viewed 7049 times ]
File comment: HowItIsExporting
render.gif
render.gif [ 121.86 KiB | Viewed 7049 times ]
Author:  Thomas Hoevel [ Wed Oct 16, 2013 12:36 pm ]
Post subject:  Re: Adding background image renders grainy and choppy
Hi!

I presume your code will work under Windows XP.

Here's a proposed change that may work with Windows NT 6.0 through 6.3 (aka Vista, 7, 8, 8.1):
viewtopic.php?p=6963#p6963
Author:  DaveRook [ Wed Oct 16, 2013 2:34 pm ]
Post subject:  Re: Adding background image renders grainy and choppy
Thank you for the reply but the post cited has left me confused.

The post suggests the following

Quote:
using (FileStream sourceFile = File.OpenRead(image.path))


But, as far as I know,
Code:
image
doesn't have a path property.

Either way, I can just create a string reference but, I don't see how I then pass this from a memory object into an XImage

Code:
graphics.DrawImage(xImagePosterBackground, new XPoint(0, 0));
Author:  Thomas Hoevel [ Wed Oct 16, 2013 2:51 pm ]
Post subject:  Re: Adding background image renders grainy and choppy
The change has to go to the XImage.cs file - and there is a path member (or _path).
Author:  DaveRook [ Fri Oct 18, 2013 1:36 pm ]
Post subject:  Re: Adding background image renders grainy and choppy
I did what you suggested so the ximage.cs file now looks like

Code:
#if GDI

      memory = new MemoryStream();
     
        if (!image.path.StartsWith("*"))
      {
         using (FileStream sourceFile = File.OpenRead(image.path))
         {
            int count = 0;
            byte[] buffer = new byte[1024];
            memory = new MemoryStream((int)sourceFile.Length);
            do
            {
               count = sourceFile.Read(buffer, 0, buffer.Length);
               memory.Write(buffer, 0, buffer.Length);
            }
            while (count > 0);

         }
      }
      else
      {
         memory = new MemoryStream();
         image.gdiImage.Save(memory, ImageFormat.Jpeg);
      }

       
       //DR comment based upon pdfsharp suggestion image.gdiImage.Save(memory, ImageFormat.Jpeg);
      if ((int)memory.Length == 0)
      {
        Debug.Assert(false, "Internal error? JPEG image, but file not found!");
      }
#endif


This made no difference I'm afraid to say.

Thank you for your quick replies so far, it is appreciated.

Do you know what I've done wrong?
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