M-JPEG Format B

The following two fields have been added to format B:

Start of scan offset: Specifies the offset, in bytes, from the start of the field data to the contents of the start of scan data. This field should never be set to 0.
Start of data offset: Specifies the offset, in bytes, from the start of the field data to the start of the data stream. Typically this immediately follows the start of scan data.