Create Bitmap Programmatically in C#

Create-Bitmap-in-CSharp.md

Learn how to create a bitmap programmatically in C# : https://blog.aspose.com/create-bitmap-in-csharp/

The following topics are covered in this article:

1. C# API to Create, Load, Fill, and Draw Bitmap
2. Create a New Bitmap From Scratch
3. Create a Bitmap from Byte Array
4. Save Bitmap as Image File
5. Draw Shapes on Bitmap
6. Draw Text on Bitmap Image
7. Fill a Bitmap with Solid Color
8. Load an Image in Bitmap
9. Resize an Existing Image using Bitmap

Create-Bitmap-in-CSharp_CreateNew.cs

// This code example demonstrates how to create a new bitmap programmatically in C#.
// Initialize Bitmap object
Bitmap bitmap = new Bitmap(1000, 800, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);

// Create a new Graphics
Graphics graphics = Graphics.FromImage(bitmap);

// Initialize a pen
Pen pen = new Pen(Color.Red, 5);

// Draw a rectangle
graphics.DrawEllipse(pen, new Rectangle(0, 0, 700, 700));

// Save the file
bitmap.Save(@"C:\Files\Drawings\output.png");

Create-Bitmap-in-CSharp_DrawText.cs

// This code example demonstrates how to draw a text on a new bitmap programmatically in C#.
// Initialize Bitmap object
Bitmap bitmap = new Bitmap(500,200);

// Create a new Graphics
Graphics graphics = Graphics.FromImage(bitmap);

// Initialize a Font
var font = new Font(FontFamily.GenericSerif, 40f, FontStyle.Bold);

// Initialize a Brush
var brush = new SolidBrush(Color.Red);

// Draw a rectangle
graphics.DrawString("Welcome to Bitmap!", font, brush, 10, 20);

// Save the file
bitmap.Save(@"C:\Files\Drawings\output.png", ImageFormat.Png);

Create-Bitmap-in-CSharp_FromMemory.cs

// This code example demonstrates how to create a new bitmap from memory stream bytes in C#.
// Load the image and read all the bytes
var file = File.ReadAllBytes(@"C:\Files\Drawings\sample.jpg");

// Create memory stream
MemoryStream stream = new MemoryStream(file);

// Create a new bitmap
Bitmap bitmap = new Bitmap(stream);

// Save the file
bitmap.Save(@"C:\Files\Drawings\output.jpg");

Create-Bitmap-in-CSharp_LoadImage.cs

// This code example demonstrates how to load an image into a bitmap and save as a new bitmap.
// Load the image:
Bitmap image = new Bitmap(@"C:\Files\Drawings\sample.jpg");

// Initialize Bitmap with spefcified size
Bitmap bitmap = new Bitmap(1000, 1000);

// Create a new Graphics
Graphics graphics = Graphics.FromImage(bitmap);

// Draw image at specified location
graphics.DrawImage(image, 10, 10);

// Save the file
bitmap.Save(@"C:\Files\Drawings\output.png");

Create-Bitmap-in-CSharp_ResizeImage.cs

// This code example demonstrates how to create resize an existing image and create a new bitmap in C#.
// Load the image:
Bitmap image = new Bitmap(@"C:\Files\Drawings\sample.jpg");

// Create a new bitmap half of the size of loaded image:
Bitmap bitmap = new Bitmap(image, (int)(image.Width * 0.5), (int)(image.Height * 0.5));

// Save the file
bitmap.Save(@"C:\Files\Drawings\output.jpg");

Create-Bitmap-in-CSharp_WithFilledRectangle.cs

// This code example demonstrates how to create a new bitmap with filled rectangle in C#.
// Initialize Bitmap with spefcified size
Bitmap bitmap = new Bitmap(500, 500);

// Create a new Graphics
Graphics graph = Graphics.FromImage(bitmap);

// Define a rectangle
Rectangle ImageSize = new Rectangle(0, 0, 500, 500);

// Draw a filled rectangle
graph.FillRectangle(Brushes.Gray, ImageSize);

// Save the file
bitmap.Save(@"C:\Files\Drawings\output.png");