// Delete image:
imageHelper.DeleteImage(imageInfos[0]);

// Extract images:
int index = 0;
foreach (PdfImageInfo info in imageInfos)
{
    info.Image.Save(outputFile_I + string.Format("Image-{0}.png", index));
    index++;
}

// Replace image:
PdfImage image = PdfImage.FromFile(TestUtil.DataPath + "ImgFiles/E-iceblue logo.png");
imageHelper.ReplaceImage(imageInfos[0], image);

// Compress images:
foreach (PdfPageBase page in doc.Pages)
{
    foreach (PdfImageInfo info in imageHelper.GetImagesInfo(page))
    {
        bool success = info.TryCompressImage();
    }
}

byte[] svgByte = shape.SaveAsSvgInSlide();
FileStream fs = new FileStream("shapePath_" + num + ".svg", FileMode.Create);
fs.Write(svgByte, 0, svgByte.Length);
fs.Close();

IAutoShape autoShape = shape as IAutoShape;
SizeF size = autoShape.TextFrame.GetTextSize();

Presentation ppt = new Presentation();
ppt.LoadFromFile(inputFile);
ISlide slide = ppt.Slides[0];
for (int i = 0; i < slide.Shapes.Count; i++)
{
    IAutoShape shape = (IAutoShape)slide.Shapes[i];
    File.AppendAllText(outputFile, "shape" + i + ":" + "\r\n");
    IList<LineText> lines = shape.TextFrame.GetLayoutLines();
    for (int j = 0; j < lines.Count; j++)
    {
        File.AppendAllText(outputFile,"line[" + j + "]:" + lines[j].Text + "\r\n");
    }
}

Presentation ppt = new Presentation();
ppt.LoadFromFile(inputFile);
OleObjectCollection oles = ppt.Slides[0].OleObjects;
OleObject oleObject = oles[0];
StringBuilder sb = new StringBuilder();
sb.AppendLine("ShapeID=" + oleObject.ShapeID);
foreach (DictionaryEntry entry in oleObject.Properties)
{
    sb.AppendLine(entry.Key + ":" + entry.Value);
}
File.AppendAllText(outputFile, sb.ToString());