PDFRasterizer.NET 4.0 is now available. Supports .NET Core. Renders pixel-perfectly.
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Replace field with image
This code sample opens a PDF with a textfield and replaces this textfield with an image. The image has the same width and its aspect ratio is preserved. The top-left corner of the image is placed at the top-left corner of the field.
// open textField.pdf
using (FileStream fileIn = new FileStream("textfield.pdf", FileMode.Open))
{
Document pdf = new Document(fileIn);
// get the widget of field 'textField'
TextField field = pdf.Fields["textField"] as TextField;
Widget widget = field.Widgets[0];
// create a new image an place it over the widget
ImageShape image = new ImageShape("pyramid.png");
image.Width = widget.Width;
image.KeepAspectRatio = true;
image.Transform = new TranslateTransform(widget.Left, widget.Top - image.Height);
pdf.Pages[0].Overlay.Add(image);
// remove the widget when saving
widget.Persistency = WidgetPersistency.Remove;
// save as image.pdf
using (FileStream fileOut = new FileStream("image.pdf", FileMode.Create))
{
pdf.Write(fileOut);
}
}

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