Introduction

This article explains how to write text on an image using ASP.NET and C#. In this article I am using some common library functions and methods.

Image Class and Bitmap Class
  • The Image class is an example of an Abstract Class.

  • The Bitmap class is an implementation of the Image class and it inherits from the Abstract Image class.

  • After implementation we can get the Image Class functionality in the Bitmap Class.
C# Code

The following code is to write a text on an image. We can change the functionalities based on our requirements.
  1. //creating a image object
  2. System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image
  3. //draw the image object using a Graphics object
  4. Graphics graphicsImage = Graphics.FromImage(bitmap);
  6. //Set the alignment based on the coordinates
  7. StringFormat stringformat = new StringFormat();
  8. stringformat.Alignment = StringAlignment.Far;
  9. stringformat.LineAlignment = StringAlignment.Far;
  11. StringFormat stringformat2 = new StringFormat();
  12. stringformat2.Alignment = StringAlignment.Center;
  13. stringformat2.LineAlignment = StringAlignment.Center;
  15. //Set the font color/format/size etc..
  16. Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//direct color adding
  17. Color StringColor2 = System.Drawing.ColorTranslator.FromHtml("#e80c88");//customise color adding
  18. string Str_TextOnImage = "Happy";//Your Text On Image
  19. string Str_TextOnImage2 = "Onam";//Your Text On Image
  21. graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
  22. FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
  23. stringformat); Response.ContentType = "image/jpeg";
  25. graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
  26. FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
  27. stringformat2); Response.ContentType = "image/jpeg";
  28. bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);
Graphics & Bitmap

A Bitmap is an object used to work with images defined by pixel data and you can draw the image object using a Graphics object. Here's the code:
  1. //creating a image object
  2. System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image
  3. //draw the image object using a Graphics object
  4. Graphics graphicsImage = Graphics.FromImage(bitmap);
Formatting the string

Change Text Alignment based on the coordinates:
  1. //Set the alignment based on the coordinates
  2. StringFormat stringformat = new StringFormat();
  3. stringformat.Alignment = StringAlignment.Far;
  4. stringformat.LineAlignment = StringAlignment.Far;
  6. StringFormat stringformat2 = new StringFormat();
  7. stringformat2.Alignment = StringAlignment.Center;
  8. stringformat2.LineAlignment = StringAlignment.Center;
Text On Image

Set the font color, size, format.
  1. string Str_TextOnImage = "Happy";//Your Text On Image
  2. string Str_TextOnImage2 = "Onam";//Your Text On Image
  4. graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
  5. FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
  6. stringformat); Response.ContentType = "image/jpeg";
  8. graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
  9. FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
  10. stringformat2); Response.ContentType = "image/jpeg";
String Color

Adding the string color in the following two ways.
  1. Color StringColor = System.Drawing.Color.Red;//direct color adding
  2. Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//customise color adding
Important Section

Namespace
  1. using System.Drawing;
  2. using System.Drawing.Imaging;
The preceding namespace contains Graphics, Bitmaps, Image Editing and Alignment libraries and other libraries.

Output
Reference
Summary
We learned how to write text on an image using ASP.NET and C#. I hope this article is useful for everyone.