Level 2 Help for COLORT2

The input is a set of three images. The proper order of datasets is important.
The proper ordering is:
                           Input 1     Input 2       Input 3
                           =======     =======       =======
    For FROM=BGR or DN      Blue        Green          Red
        FROM=RGB             Red        Green         Blue
        FROM=TRISTIMULUS**  Green        Red        Intensity
        FROM=CIE**            X           Y         Intensity
        FROM=UCS**            U           V         Intensity
        FROM=HSI             Hue      Saturation    Intensity
        FROM=SPHERICAL    Longitude   Colatitude    Radiance
        FROM=HSR             Hue      Saturation    Radiance
        FROM=CUBEROOT**      A*          B*            L*

**:  Not yet supported.

The output is a set of three images in the same format as the input files. 
The proper order of datasets is important.
The proper ordering is:
                         Output1     Output2       Output3
                         =======     =======       =======
    For TO=BGR or DN      Blue        Green          Red
        TO=RGB             Red        Green         Blue
        TO=TRISTIMULUS**  Green        Red        Intensity
        TO=CIE**            X           Y         Intensity
        TO=UCS**            U           V         Intensity
        TO=HSI             Hue      Saturation    Intensity
        TO=SPHERICAL    Longitude   Colatitude    Radiance
        TO=HSR             Hue      Saturation    Radiance
        TO=CUBEROOT**      A*          B*            L*

**:  Not yet supported.

This parameter signifies the coordinate space of the input datasets. Valid
spaces are BGR, DN (this is the same space as BGR), HSI, SPHERICAL, HSR and
RGB. The default is BGR. The variables FROM and TO cannot both be defaulted 
and one of them must be BGR/RGB.
(TRISTIMULUS, CIE, UCS and CUBEROOT are not yet supported.)

This parameter signifies the coordinate space of the output datasets. Valid
spaces are BGR, DN (this is the same space as BGR), HSI, SPHERICAL, HSR and
RGB. The default is BGR. The variables FROM and TO cannot both be defaulted 
and one of them must be BGR/RGB.
(TRISTIMULUS, CIE, UCS and CUBEROOT are not yet supported.)

The maximum output DN, when going from BGR/RGB space to one of the others.
When transforming to BGR/RGB space, the program will attempt to get this
parameter from the input labels.  If it is not found, it should be specified
by the user (except for byte data);  it is important that the same value be
given as was used when going from BGR/RGB mode.

For byte input files, this parameter is ignored and 255 is always used.
For halfword input files, if this parameter is not specified, then 4095 is used.
For fullword integer or real*4 input files, this parameter is required.