private static byte[] GeneratePngOutput(byte[] renderedBytes, out string mimeType)
{
Bitmap tiff = (Bitmap)Image.FromStream(new MemoryStream(renderedBytes));
List <Bitmap> pages = ImageHelpers.GetAllPages(tiff).Select(p => (Bitmap)p).ToList();
var mergedBitmap = new Bitmap(pages.Max(p => p.Width), pages.Sum(p => p.Height));
int heigthShift = 0;
foreach (var image in pages)
{
for (int x = 0; x < image.Width; x++)
{
for (int y = 0; y < image.Height; y++)
{
mergedBitmap.SetPixel(x, y + heigthShift, image.GetPixel(x, y));
}
}
heigthShift += image.Height;
}
var pngStream = new MemoryStream();
mergedBitmap.Save(pngStream, ImageFormat.Png);
pngStream.Seek(0, 0);
mimeType = "image/png";
return(pngStream.ToArray());
}