QUERY_JPG is a method of obtaining information about a JPEG image file without having to read the file. See QUERY_* Routines for more information.
Result = QUERY_JPEG ( Filename [, Info] )
This routine returns a long with the value of 1 (one) if the query was successful (and the file type was correct) or 0 (zero) on failure.
A scalar string containing the pathname of the JPEG file to query.
Returns an anonymous structure containing information about the image in the file. The Info.TYPE field will return the value ‘JPEG’.
Note: See General Query * Routine Info Structures for detailed structure information.