Sets the opacity of the watermark in the document.
| Name | Type | Description |
| nOpacity | number | The watermark opacity. This value must be from 0 to 255. |
builder.CreateFile("docx");
var oDocument = Api.GetDocument();
oDocument.InsertWatermark("Watermark", true);
var oSettings = oDocument.GetWatermarkSettings();
oSettings.SetOpacity(100);
oDocument.SetWatermarkSettings(oSettings);
var nOpacity = oSettings.GetOpacity();
var oParagraph = oDocument.GetElement(0);
oParagraph.AddText("Watermark opacity: "+ nOpacity);
builder.SaveFile("docx", "SetOpacity.docx");
builder.CloseFile();