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 don't know what that "image number" is. If you want to know the number of photos that camera has taken, the file may contain a "ShutterCount" field, which exiftool can tell you:
Quite possibly you can also get it from ImageMagick, with some strange incantation. But for metadata that isn't directly concerned with images, I prefer exiftool.