Merge JPG Images and Save them as PNG

mergeJPEGImagesAndSaveAsPNG.cs

// An array of images you want to merge.
string[] imagePaths = { "Image1.jpeg", "Image2.jpg" };

string outputPath = "MergeHorizontalAsPNG";

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

// Width and height of the resulting image.
int newWidth = imageSizes.Sum(size => size.Width);
int newHeight = imageSizes.Max(size => size.Height);

// Merging images into one and save as PNG
using (MemoryStream memoryStream = new MemoryStream())
{
    StreamSource outputStreamSource = new StreamSource(memoryStream);
    JpegOptions options = new JpegOptions() { Source = outputStreamSource, Quality = 100 };
    using (JpegImage newImage = (JpegImage)Image.Create(options, newWidth, newHeight))
    {
        int stitchedWidth = 0;
        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;
            }
        }

        newImage.Save(outputPath + ".png", new PngOptions());
    }
}