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?".
An image name ending with a colon ":" is a built-in facility of ImageMagick, rather than a file that contains an image.
"rose:" is an image that is built-in to ImageMagick. Instead of using a filename, "rose:" simply provides a standard test image. Other built-in images include "wizard:" and "logo:".