Merge Multiple Images using C#

readme.md

Read the complete article on merging multiple images using C#: https://blog.aspose.com/2021/08/09/merge-multiple-images-using-csharp/

merge-images-horizontally.cs

// Create list of images
string[] imagePaths = { "image1.jpg", "image2.jpg", "image3.jpg", "image4.JPG", "image5.png" };

// To create a temporary image
string tempFilePath = "temp.jpg";

// Get resulting image's size
List <Size> imageSizes = new List<Size>();
foreach (string imagePath in imagePaths)
{
    using (RasterImage image = (RasterImage)Image.Load(imagePath))
    {
        imageSizes.Add(image.Size);
    }
}

int newWidth = imageSizes.Sum(size => size.Width);
int newHeight = imageSizes.Max(size => size.Height);

// Combine images into new one
Source tempFileSource = new FileCreateSource(tempFilePath, isTemporal: true);

// Create jpeg options
JpegOptions options = new JpegOptions() { Source = tempFileSource, Quality = 100 };
using (JpegImage newImage = (JpegImage)Image.Create(options, newWidth, newHeight))
{
    int stitchedWidth = 0;
    
    // Merge images
    foreach (string imagePath in imagePaths)
    {
        using (RasterImage image = (RasterImage)Image.Load(imagePath))
        {
            Rectangle bounds = new Rectangle(stitchedWidth, 0, image.Width, image.Height);
            newImage.SaveArgb32Pixels(bounds, image.LoadArgb32Pixels(image.Bounds));
            stitchedWidth += image.Width;
        }
    }
    
    // Save the merged image
    newImage.Save(outputPath);
}

merge-images-vertically.cs

// Create a list of images
string[] imagePaths = { "image1.jpg", "image2.jpg", "image3.jpg", "image4.jpg", "image5.png" };

// Get resulting image's size
List<Size> imageSizes = new List<Size>();
foreach (string imagePath in imagePaths)
{
    using (RasterImage image = (RasterImage)Image.Load(imagePath))
    {
        imageSizes.Add(image.Size);
    }
}

int newWidth = imageSizes.Max(size => size.Width);
int newHeight = imageSizes.Sum(size => size.Height);

// Combine images into new one
using (MemoryStream memoryStream = new MemoryStream())
{
    // Create output source
    StreamSource outputStreamSource = new StreamSource(memoryStream);
    
    // Create jpeg options
    JpegOptions options = new JpegOptions() { Source = outputStreamSource, Quality = 100 };
    
    // Create output image
    using (JpegImage newImage = (JpegImage)Image.Create(options, newWidth, newHeight))
    {
        int stitchedHeight = 0;
        // Merge images
        foreach (string imagePath in imagePaths)
        {
            using (RasterImage image = (RasterImage)Image.Load(imagePath))
            {
                Rectangle bounds = new Rectangle(0, stitchedHeight, image.Width, image.Height);
                newImage.SaveArgb32Pixels(bounds, image.LoadArgb32Pixels(image.Bounds));
                stitchedHeight += image.Height;
            }
        }
        
        // Save the merged image
        newImage.Save("merged-image.jpg");
    }
}