Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
I believe that you only need one \! at the end, thought I suspect that will not hurt otherwise. Also GreenKoopa is right, you need to remove the virtual canvas after a crop if saving to PNG, unless you need to keep it for some reason.