Poor Image quality on PDF when coming from Aspose.Chart

Aspose.PDF Product Family
1

Hi

I have a problem with Aspose.PDF and Aspose.Chart working together: the image on the PDF is very poor in quality and the print of the PDF is not acceptable. I m developing Financial documents where the quality takes the first place.

Here is the C# code to create the images including them into the pdf:

Chart:

Chart c = new Chart();

... Chart configurations....

c.Height = 450F;

c.Width = 800F;

... Chart data retrieving ...

// Finally chart saving

MemoryStream ms = new MemoryStream();

c.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);

PDF:

Pdf _pdf = new Pdf();

... Bind pdf to XML template having the section

sec1 = _pdf.Sections[0];

Aspose.Pdf.Image image = new Aspose.Pdf.Image(sec1);

//==================================================================================================================

// GET Image From MEMORY Stream

//Create a BinaryReader object to read bytes from MemoryStream for IMAGES

System.IO.BinaryReader reader = new System.IO.BinaryReader(ms);

//Set the file and open types of the image

image.ImageInfo.ImageFileType = ImageFileType.MemoryBmp;

image.ImageInfo.OpenType = ImageOpenType.Memory;

image.ImageWidth=800F;

image.ImageHeight=450F;

image.Margin.Left=5;

image.Margin.Top=20;

//Set position

ms.Position = 0;

//Read bytes from the MemoryStream and store as memory data for the image to

//be added to Pdf document

image.ImageInfo.MemoryData = reader.ReadBytes((int)ms.Length);

reader.Close();

sec1.Paragraphs.Add(image);

_pdf.Save(_PDFPath);

I tried many of the examples you posted in the forums and in the guideline without results: more of them have the method Save of the Chart to a bitmap (i.e. Bitmap bm = new Bitmap(); bm= chart.Save()) that is no more supported by the last versions.

The section has an header and a footer and is landscape A4 or Letter; the image should occupy the entire page

Please give me a solution since I have to deliver the documents by the end of this month January 2006.

Note that we have bought the Aspose.Total license.

Thanks

vmax

2

Dear vmax,

Thank you for considering Aspose.

Can you please attach the chart image and let me test it?

3

Hi

I m sorry but I can't send you the chart since are reserved info but you can easily create it with the Aspose.Chart.

You can create a chart you want following your examples ! You only must create it 450x800 and save it into memory stream before adding it to the PDF.

However please find attached a part of the chart taken from the created PDF.

I posted the same problem to the Aspose.Chart support people since I m not sure who is responsible of the poor quality.

Regards

vmax

4

Ok. I will test it and reply to you ASAP.

5

Please try saving the chart into image file and see if you are satisfied with it.

6

Hi

I finally found a way to get best quality in images created by the Aspose.Chart and then imported into the PDF.

Summarizing, to have a good quality of Chart to be imported into the Aspose.Pdf document I had to do:

  • Set big image 900x1600 size
  • Set appropriate font size for the labels, legends, titles accordingly to the big size
  • Set the Series.DefaultDataPoint.BorderWidth to an appropriate value for Curve or Line charts
  • Save the Chart onto the hard disk as PNG
  • Finally import the created image into the PDF by scaling it to an half (ImageScale=0.5F) becoming 450x800

The image is well fit into the PDF page with a good quality in viewing and printing.

I experienced that saving the image into a memory stream they must be imported into the PDF only as MemoryBmp with loss of quality thus I would suggest to anyone not to follow this approach waiting for the support of other formats.

Passing through a hard disk file is slow and make the developer to keep the temporary directory clean and keep the file names unique especially in a web environmemt. I suggest to use the System.Guid as prefix of the chsrts filenames: I used

String _imageFilePath = ServerPath+@"\TemporaryFiles\"+ Guid +".png";

c.Save(_imageFilePath, System.Drawing.Imaging.ImageFormat.Png);

for saving the charts and then

Aspose.Pdf.Image image = new Aspose.Pdf.Image(sec1);

image.Margin.Top=10;

//Set scale

image.ImageScale = 0.5F;

//Set file name and type

image.ImageInfo.File = _imageFilePath;

image.ImageInfo.ImageFileType = ImageFileType.Png;

//Add image to the PDF section

sec1.Paragraphs.Add(image);

I hope someone else be aided by this threat.

Best Regards

vmax

7

We will surely support memory image for all supported type.

8

Ok

please let me know when a new version supporting all image format will be available.

Thanks

vmax

9

Dear vmax,

This feature is now supported in the hotfix 2.9.2.