992847: Added Sample for get the appearance of the annotations.

PDF-to-image/PDFToImage_Annotation_Appearance/App.xaml

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+<Application x:Class="PDFToImage_Annotation_Appearance.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:PDFToImage_Annotation_Appearance"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

PDF-to-image/PDFToImage_Annotation_Appearance/App.xaml.cs

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+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace PDFToImage_Annotation_Appearance
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+
+}

PDF-to-image/PDFToImage_Annotation_Appearance/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
+                                                //(used if a resource is not found in the page,
+                                                // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
+                                                //(used if a resource is not found in the page,
+                                                // app, or any theme specific resource dictionaries)
+)]

PDF-to-image/PDFToImage_Annotation_Appearance/MainWindow.xaml

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+<Window x:Class="PDFToImage_Annotation_Appearance.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:PDFToImage_Annotation_Appearance"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+        <Button Content="Button" HorizontalAlignment="Left" Margin="10" VerticalAlignment="Top" Click="Button_Click"/>
+    </Grid>
+</Window>

PDF-to-image/PDFToImage_Annotation_Appearance/MainWindow.xaml.cs

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+using Syncfusion.Pdf;
+using Syncfusion.Pdf.Graphics;
+using Syncfusion.Pdf.Interactive;
+using Syncfusion.PdfToImageConverter;
+using System.Drawing;
+using System.IO;
+using System.Windows;
+
+namespace PDFToImage_Annotation_Appearance
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+            //Creates a new pdf document
+            PdfDocument document = new PdfDocument();
+            //Creates a new page
+            PdfPage page = document.Pages.Add();
+
+            //Creates PDF free text annotation
+            PdfFreeTextAnnotation freeText = new PdfFreeTextAnnotation(new RectangleF(50, 100, 100, 50));
+            //Sets properties to the annotation
+            freeText.MarkupText = "Free Text with Callout";
+            freeText.TextMarkupColor = new PdfColor(System.Drawing.Color.Black);
+            freeText.Font = new PdfStandardFont(PdfFontFamily.Helvetica, 7f);
+            freeText.Color = new PdfColor(System.Drawing.Color.Yellow);
+            freeText.BorderColor = new PdfColor(System.Drawing.Color.Red);
+            freeText.Border = new PdfAnnotationBorder(.5f);
+            freeText.LineEndingStyle = PdfLineEndingStyle.OpenArrow;
+            freeText.AnnotationFlags = PdfAnnotationFlags.Default;
+            freeText.Text = "Free Text";
+            freeText.Opacity = 0.5f;
+            PointF[] points = { new PointF(100, 450), new PointF(100, 200), new PointF(100, 150) };
+            freeText.CalloutLines = points;
+            freeText.SetAppearance(true);
+            //Adds the annotation to page
+            page.Annotations.Add(freeText);
+
+            //Save the document
+            document.Save("../../../Output.pdf");
+            //Closes the document
+            document.Close(true);
+        }
+        private void Button_Click(object sender, RoutedEventArgs e)
+        {
+            PdfToImageConverter imageConverter = new PdfToImageConverter();
+            using (FileStream inputStream = new FileStream("../../../Output.pdf", FileMode.Open, FileAccess.ReadWrite))
+            {
+                imageConverter.Load(inputStream);
+                // Convert the first page (index 0)
+                using (Stream outputStream = imageConverter.Convert(0, false, false))
+                using (Bitmap Image = new Bitmap(outputStream))
+                {
+                    Image.Save("sample.png"); // Produces an image that includes the FreeText annotation
+                }
+            }
+        }
+    }
+}

PDF-to-image/PDFToImage_Annotation_Appearance/PDFToImage_Annotation_Appearance.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+  </PropertyGroup>
+	<ItemGroup>
+		<PackageReference Include="Syncfusion.PdfViewer.WPF" Version="*" />
+		<PackageReference Include="System.Drawing.Common" Version="10.0.1" />
+	</ItemGroup>
+  <Import Project="targets\MultiTargeting.targets" /> 
+</Project>

PDF-to-image/PDFToImage_Annotation_Appearance/PDFToImage_Annotation_Appearance.slnx

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+<Solution>
+  <Project Path="PDFToImage_Annotation_Appearance.csproj" />
+</Solution>

PDF-to-image/PDFToImage_Annotation_Appearance/targets/MultiTargeting.targets

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+<Project>
+  <PropertyGroup>
+    <TargetFrameworks>net462;net8.0-windows;net9.0-windows;net10.0-windows</TargetFrameworks>
+    <UseWPF>true</UseWPF>
+    <GenerateAssemblyInfo>False</GenerateAssemblyInfo>
+    <GenerateDocumentationFile>True</GenerateDocumentationFile>
+    <EnableDefaultItems>True</EnableDefaultItems>
+	<EnableDefaultEmbeddedResourceItems>True</EnableDefaultEmbeddedResourceItems>	
+  </PropertyGroup>
+</Project>