Specifies the maximum output level shown in logs. The accepted values are: 1 = Errors only 2 = Errors and warnings 3 = Errors, ...

Specifies the maximum output level shown in logs. The accepted
  values are:
    1 = Errors only
    2 = Errors and warnings
    3 = Errors, warnings, and information
    4 = All the above and debug output

  If not specified, it defaults to 3 (maximum logging).

    Example:
      DISM.exe /Image:C:	est\offline /loglevel:1