Write Text on Image Using ASP.NET and C#

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.

//creating a image object
System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image
//draw the image object using a Graphics object
Graphics graphicsImage = Graphics.FromImage(bitmap);

//Set the alignment based on the coordinates
StringFormat stringformat = new StringFormat();
stringformat.Alignment = StringAlignment.Far;
stringformat.LineAlignment = StringAlignment.Far;

StringFormat stringformat2 = new StringFormat();
stringformat2.Alignment = StringAlignment.Center;
stringformat2.LineAlignment = StringAlignment.Center;

//Set the font color/format/size etc..
Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//direct color adding
Color StringColor2 = System.Drawing.ColorTranslator.FromHtml("#e80c88");//customise color adding
string Str_TextOnImage = "Happy";//Your Text On Image
string Str_TextOnImage2 = "Onam";//Your Text On Image

graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
stringformat); Response.ContentType = "image/jpeg";

graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
stringformat2); Response.ContentType = "image/jpeg";
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: 

//creating a image object
System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("onam.jpg")); // set image
//draw the image object using a Graphics object
Graphics graphicsImage = Graphics.FromImage(bitmap);

Formatting the string

Change Text Alignment based on the coordinates:

//Set the alignment based on the coordinates
StringFormat stringformat = new StringFormat();
stringformat.Alignment = StringAlignment.Far;
stringformat.LineAlignment = StringAlignment.Far;

StringFormat stringformat2 = new StringFormat();
stringformat2.Alignment = StringAlignment.Center;
stringformat2.LineAlignment = StringAlignment.Center;

Text On Image

Set the font color, size, format.

string Str_TextOnImage = "Happy";//Your Text On Image
string Str_TextOnImage2 = "Onam";//Your Text On Image

graphicsImage.DrawString(Str_TextOnImage, new Font("arial", 40,
FontStyle.Regular), new SolidBrush(StringColor), new Point(268, 245),
stringformat); Response.ContentType = "image/jpeg";

graphicsImage.DrawString(Str_TextOnImage2, new Font("Edwardian Script ITC", 111,
FontStyle.Bold), new SolidBrush(StringColor2), new Point(145, 255),
stringformat2); Response.ContentType = "image/jpeg";

String Color

Adding the string color in the following two ways.

Color StringColor = System.Drawing.Color.Red;//direct color adding
Color StringColor = System.Drawing.ColorTranslator.FromHtml("#933eea");//customise color adding

Important Section

Namespace 

using System.Drawing;
using System.Drawing.Imaging;

The preceding namespace contains Graphics, Bitmaps, Image Editing and Alignment libraries and other libraries.

Output

 

 

Reference

•  Tech Blog Content

Summary 

 

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