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Compressing images in PDF
https://forum.pdfsharp.net/viewtopic.php?f=2&t=1913		 Page 1 of 1
Author:  SaschaS [ Fri Feb 17, 2012 12:02 pm ]
Post subject:  Compressing images in PDF
Hi,

Iam trying to save .pdf with multiple pages and compressed images as described here:
http://forum.pdfsharp.net/viewtopic.php?f=2&t=1825&p=5206&hilit=compress#p5206

In order to use compressed images in my document, I saved the images as compressed .jpeg to a stream.

Code:
EncoderParameter epQuality = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)30);
ImageCodecInfo[] iciCodecs = ImageCodecInfo.GetImageEncoders();
EncoderParameters epParameters = new EncoderParameters(1);
epParameters.Param[0] = epQuality;
img.Save(stream, iciCodecs.Single((i) => i.MimeType == "image/jpeg"), epParameters);


Then I create the XImages from that stream...

Code:
var xImg = XImage.FromGdiPlusImage(System.Drawing.Image.FromStream(stream);


Unfortunately it does not work this way...Am I doing something wrong?

Here is my complete source:

Code:
public void AddImage(System.Drawing.Bitmap img, string path)
       {
           try
           {
               // Compress image first
               using (var stream = new MemoryStream())
               {
                   EncoderParameter epQuality = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)30);
                   ImageCodecInfo[] iciCodecs = ImageCodecInfo.GetImageEncoders();
                   EncoderParameters epParameters = new EncoderParameters(1);
                   epParameters.Param[0] = epQuality;
                   img.Save(stream, iciCodecs.Single((i) => i.MimeType == "image/jpeg"), epParameters);

                   using (var xImg = XImage.FromGdiPlusImage(System.Drawing.Image.FromStream(stream)))
                   {
                       var page = _document.AddPage();
                       page.Width = XUnit.FromCentimeter(21).Point;
                       page.Height = XUnit.FromCentimeter(29.7).Point;

                       var rect = new XRect(
                           PixelToPoints(0, img.HorizontalResolution),
                           PixelToPoints(0, img.HorizontalResolution),
                           PixelToPoints(img.Width, img.HorizontalResolution),
                           PixelToPoints(img.Height, img.HorizontalResolution));

                       using (var gfx = XGraphics.FromPdfPage(page, XGraphicsUnit.Point))
                       {
                           gfx.DrawImage(XImage.FromGdiPlusImage(img), rect);
                       }
                   }
               }
           }
           catch (System.Exception ex)
           {
           }
       }
Author:  Thomas Hoevel [ Tue Feb 21, 2012 9:34 am ]
Post subject:  Re: Compressing images in PDF
Hi!

Your code might work with the GDI+ build, but not with the WPF build.
Which build do you use?

Save to a temporary file to make it work with the WPF build (PDFsharp copies the original bytes into the PDF file - WPF won't give us the original bytes, so this works for files only, not streams; all other formats are converted to "PDF images", so these will work fine from streams).
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