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?".
the 100x65000 was some trial and error as I have not used vignette much. using x65000 means that the taper will be linear rather than gaussian. the 100 means that the taper should extend over about 100 pixels.