How can I concatenate multiple images into a single image using the Go image package?

Concatenating Images in Go

Concatenating multiple images into a single, larger image is a common scenario in image processing. In Go, achieving this is straightforward using the image package.

Creating an Empty Image

First, create a new image with dimensions large enough to accommodate all the smaller images.

newImage := image.NewRGBA(image.Rect(0, 0, totalWidth, maxHeight))

Here, totalWidth is the combined width of the smaller images, and maxHeight is the maximum height among them.

Drawing the Smaller Images

Next, draw each smaller image onto the new image. Determine the appropriate starting point and rectangle for each image.

for _, img := range smallerImages {
    offset := point{dx, 0}  // offset of the current image
    
    r := img.Bounds() // rectangle of the smaller image

    newImage.Draw(image.Rect(offset.X, offset.Y, offset.X+r.Dx(), offset.Y+r.Dy()), img, r.Min, draw.Src)
    
    dx += r.Dx() // update the x coordinate for the next image
}

Exporting the Concatenated Image

Finally, export the concatenated image to a file or stream.

out, err := os.Create("output.png")
if err != nil {
    return err
}

if err := png.Encode(out, newImage); err != nil {
    return err
}

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