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?".
when the convert throws an error "memory allocation failed", the "thumbnail-100x100.jpg" will still be created with the original size (e.g. 8000 x 2000)
I do not know about the question you ask, but you IM syntax is not proper for IM 6 though still may work. The input image should be read first if not a vector format.