How Can I Merge Two Images in C#/.NET?

Merging Images in C#/.NET: A Practical Example

You have two images, a 500x500 transparent image and a 150x150 image, which you want to merge into a single 500x500 canvas. Here's a step-by-step solution in C# using the System.Drawing library:

Step 1: Load the Images

using System.Drawing;

Image background = Image.FromFile("background.png");
Image overlay = Image.FromFile("overlay.png");

Step 2: Create a New Bitmap (Canvas)

int width = 500;
int height = 500;

using var bitmap = new Bitmap(width, height);

Step 3: Draw the Background Image

using var canvas = Graphics.FromImage(bitmap);

canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
canvas.DrawImage(background,
                 new Rectangle(0,
                               0,
                               width,
                               height),
                 new Rectangle(0,
                               0,
                               background.Width,
                               background.Height),
                 GraphicsUnit.Pixel);

Step 4: Calculate Overlay Position

int x = (bitmap.Width / 2) - (overlay.Width / 2);
int y = (bitmap.Height / 2) - (overlay.Height / 2);

Step 5: Draw the Overlay Image

canvas.DrawImage(overlay,
                 new Rectangle(x,
                               y,
                               overlay.Width,
                               overlay.Height));

Step 6: Save the Merged Image

bitmap.Save("merged.png");

Additional Tips:

• You can adjust the transparency of the overlay image using the Color.FromArgb() method.
• If you want to resize the overlay image before merging, use the Image.Scale() method.
• By manipulating the x and y variables, you can control the position of the overlay image on the canvas.

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