How can I combine multiple images into one in Go?

Creating a Single Image from Multiple Images in Go

Question:

In Go, how can we combine multiple image files (e.g., PNG or JPEG) into a single, larger image?

Answer:

To concatenate images in Go, follow these steps:

1. Load the Images:

   img1, _, err := image.Decode(os.Open("test1.jpg"))
   img2, _, err := image.Decode(os.Open("test2.jpg"))

2. Determine the Position:
   Decide where the second image should be placed relative to the first. For example, if you want to place it to the right, use the following:

   sp2 := image.Point{img1.Bounds().Dx(), 0}

3. Create a Large Rectangle:
   Calculate a rectangle that covers both images:

   r := image.Rectangle{image.Point{0, 0}, r2.Max}

4. Create a New Image:
   Create a new image large enough to hold both images:

   rgba := image.NewRGBA(r)

5. Draw the Images:
   Use the Draw function to place the images on the new image:

   draw.Draw(rgba, img1.Bounds(), img1, image.Point{0, 0}, draw.Src)
   draw.Draw(rgba, r2, img2, sp2, draw.Src)

6. Save the Output:
   Export the combined image:

   out, err := os.Create("./output.jpg")
   jpeg.Encode(out, rgba, &jpeg.Options{
      Quality: 80,
   })

By following these steps, you can create a single image composed of multiple images, expanding your image manipulation capabilities in Go.

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