You are unable to find the function because it is not yet available. I just submitted a patch to the GIT repository of ImageMagick to add an overload for evaluate so '-function' is available in Magick++. You will have to wait for the next release of Magick.NET to get this new feature. Feel free to contact me through CodePlex if you want a development build. I can only send you one if you are not using an AnyCPU build because it is a more work to create that version (a generous donation might motivate me :P).
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