For HTML2PDF and XML2PDF solution check our PDFDoc Scout ActiveX library instead

using System;
using System.Collections.Generic;
using System.Text;
using Bytescout.PDF;

namespace ColorizedAnnotations
{
class Program
{
static void Main(string[] args)
{
PDFDocEngine engine =
new PDFDocEngine("", "");

// Add new document
Document document = engine.AddDocument();

// Add standard font
uint font = document.AddFontStandard(StandardFontType.Courier, FontEncodingType.Standard);

// Append new pages to the document
Page page = document.AddPage(PageSizeType.A4, PageOrientationType.LandScape);

// Create new drawing
Drawing drawing = page.AddDrawing();

// Set Active Font
drawing.SetActiveFont(font, 50, false, false);

// Draw Text
drawing.PlaceText(100, 100, 0, "Hello World!");

// Close drawing
drawing.Close();

// Create rectangle
Rectangle rectangle =
new Rectangle();
rectangle.Left = 100;
rectangle.Right = 100;
rectangle.Top = 100;
rectangle.Bottom = 100;

// Add new annotation stamp
AnnotationStamp stamp =
new AnnotationStamp(page, rectangle, "Demo", AnnotationStampIconType.Approved);
// Set color
stamp.Color = Drawing.ToRGB(0, 0, 1);

// Save document
document.Save("HelloWorld.pdf");
}
}
}

Download example source code: bytescoutpdf_annotations_with_color.zip (5 KB)

For HTML2PDF and XML2PDF solution check our PDFDoc Scout ActiveX library instead