images not clear when added to presentation

[karendmello]

Hi

Using Spire.Presentation Pro Edition we are updating presentation (pptx) files and then converting it to from pptx to pdf . We are inserting a few chart images in our presentation which are not clear when added to pptx as per the standard we need . Below is the code attached and the files generated . Would appreciate help on having clear images in our presentation files .

public void insertImage(string presentationFile)
{
Spire.Presentation.Presentation presentation = new Presentation();
presentation.LoadFromFile(presentationFile);

string strChartImagePath = "image path";

string ImageFile = "BBchart.png";
string strImagePath = strChartImagePath + @"\" + ImageFile;
Bitmap oImg = new Bitmap(strImagePath);
RectangleF recto = new RectangleF(70, 425, oImg.Width , oImg.Height );
IEmbedImage shape = presentation.Slides[0].Shapes.AppendEmbedImage(ShapeType.Rectangle, strImagePath, recto);
shape.Line.FillType = Spire.Presentation.Drawing.FillFormatType.Solid;
shape.Line.SolidFillColor.Color = Color.FromArgb(107, 202, 186);


ImageFile = "PHPCchart.png";
strImagePath = strChartImagePath + @"\" + ImageFile;
oImg = new Bitmap(strImagePath);
RectangleF rect = new RectangleF(70, 200, oImg.Width, oImg.Height );
shape = presentation.Slides[1].Shapes.AppendEmbedImage(ShapeType.Rectangle, strImagePath, rect);
shape.Line.FillType = Spire.Presentation.Drawing.FillFormatType.Solid;
shape.Line.SolidFillColor.Color = Color.FromArgb(107, 202, 186);
oImg.Dispose(); oImg = null;

ImageFile = "PHPCGroupChart.png";
strImagePath = strChartImagePath + @"\" + ImageFile;
oImg = new Bitmap(strImagePath);
rect = new RectangleF(70, 475, oImg.Width, oImg.Height);
shape = presentation.Slides[1].Shapes.AppendEmbedImage(ShapeType.Rectangle, strImagePath, rect);
shape.Line.FillType = Spire.Presentation.Drawing.FillFormatType.Solid;
shape.Line.SolidFillColor.Color = Color.FromArgb(107, 202, 186);
oImg.Dispose(); oImg = null;

presentation.SaveToFile(presentationFile, FileFormat.Pptx2010);
}

public void PPTtoPDF(string srcFilePPT, string destinationFilePDF)
{

//create PPT document
Presentation presentation = new Presentation();

//load PPT file from disk
presentation.LoadFromFile(srcFilePPT);

//save the PPT do PDF file format
presentation.SaveToFile(destinationFilePDF, FileFormat.PDF);

System.Diagnostics.Process.Start(destinationFilePDF);


}

[Annika.Zhou]

Hello,

Thanks for your inquiry.
Kindly note the unit of picture is Pixel, while the unit in our Spire.Presentation is Point. In your case, you defined the rectangle size according to the picture size. Because of the different units, the rectangle size is actually larger than the real size of the picture, so the added picture is stretched in generated pptx. This causes the ambiguous images issue. To solve this problem, please refer to the following code to convert Pixel unit to Point.

Code: Select all

Bitmap oImg = new Bitmap(strImagePath);

//Convert unit
PdfUnitConvertor convertorUnit = new PdfUnitConvertor();
//Convert Pixel unit to Point
float widthInPoint = convertorUnit.ConvertUnits(oImg.Width, PdfGraphicsUnit.Pixel, PdfGraphicsUnit.Point);
float heightInPoint = convertorUnit.ConvertUnits(oImg.Height, PdfGraphicsUnit.Pixel, PdfGraphicsUnit.Point);

RectangleF recto = new RectangleF(70, 425, widthInPoint, heightInPoint);
IEmbedImage shape = presentation.Slides[0].Shapes.AppendEmbedImage(ShapeType.Rectangle, strImagePath, recto);

Sincerely,
Annika
E-iceblue support team

[Annika.Zhou]

Hello,

Hope you're doing well.
How is your issue going? Can you give us some feedback at your convenience? Thanks in advance.

Sincerely,
Annika
E-iceblue support team

[karendmello]

Hi

thank u for point this out , this solution worked for us

[Annika.Zhou]

Hi,

You're welcome.
If you have other questions about using Spire.Presentation in the future, please feel free to contact us.

Sincerely,
Annika
E-iceblue support team