I have an open question that is unsolved, but I have come up with an alternate approach that avoids the original problem. I posted my workaround as an edit to my question, because I think it might be helpful to someone else facing the same problem.
I didn't post it as an answer because it doesn't really address the original question. I also don't feel like my workaround is the best way to avoid the problem, and would prefer to find a solution to the original question.
My question now, is whether that was the correct approach. Should I have posted the alternate approach as an answer? Or just added a comment?
The question I'm referencing:Add text label with semi transparent background to an image using Magick.NET