Questions and postings pertaining to the development of ImageMagick, feature enhancements, and ImageMagick internals. ImageMagick source code and algorithms are discussed here. Usage questions which are too arcane for the normal user list should also be posted here.
How do you know they do not work. Try running the command line with explicit values in a terminal. Also your syntax is not fully correct, though it may not matter. Put the input image right after convert and before the resize.