Aren't you missing a step in the example above? Step 5 calls Merge of object2 but MagickImage does not contain a Merge method. You probably created a MagickImageCollection at some point.
The reason you are not seeing the watermark is because you are writing two images to the stream instead of only one. An image looks something like this:
You should only write the result of the Merge method to the destinationStream.
The reason you are not seeing the watermark is because you are writing two images to the stream instead of only one. An image looks something like this:
+------------------+
| Header of image |
| +--------------+ |
| | Size of data | |
| +--------------+ |
+------------------+
| Image data |
+------------------+You should only write the result of the Merge method to the destinationStream.
using (MagickImageCollection images = new MagickImageCollection()) { images.Add("image.png"); images.Add("watermark.png"); using (MagickImage result = images.Merge()) { result.Write(destinationStream); } }