If you try to use the EncoderValue.CompressionCCITT4 value to save a Bitmap out as a 1 BPP Tiff file, you will get an error "Invalid Parameter Value". It turns out that .NET can't go from an RGB to a Bitonal image with the Save method on a Bitmap (no matter how you set the encoder parameters). The following posting by Michael McCloskey solves the problem:
http://www.codeproject.com/KB/GDI-plus/BitonalImageConverter.aspx?msg=2020403
Easy to use and runs quickly.
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