The UseMonochrome option is only support by PCL, PDF, PS and XPS so that option doesn't do anything. I just modified the comment to clarify this. Can you share an input image that becomes completely black? And what are you using to view the image? You can post a link to something like Dropbox to share that image. Might be nice to also share your output tiff file. And can you tell me the version of Magick.NET that you are using?
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