profile/applycal
    Summary
    Apply, re-apply or remove calibration curves to an ICC profile.
    Usage Summary
    usage: applycal
        [-options]
        [calfile.cal] inprof.icm [outprof.icm]
         -v             
Verbose
        mode
         -a             
Apply
        or re-apply calibration (default)
         -u             
Remove
        calibration
         -c             
Check
        calibration
         calfile.cal    
        Calibration
        file to apply
         inprof.icm     
        ICC
        profile to read
         outprof.icm    
        modified
        ICC
        profile to write
    
    Usage Details 
    
     The -v flag makes applycal more verbose.
    
    -a By
    default
    the calfile.cal is applied
    or
    re-applied to the inprof.icm,
    and then written to outprof.icm.
    
    -u This flag
    causes any calibration applied to the inprof.icm
    to be remove, the profile being restored to its pre-calibrated
    state,
    and then written to outprof.icm.
    
    -c This flag
    checks the inprof.icm and
    if
    verbose is on, reports whether it has had calibration applied. It
    will
    return status 0 if it has not been applied, 1 if it has, and 2 on
    error.
    
    calfile.cal 
must
    be supplied if the calibration is being applied or re-applied.
    
    inprof.icm 
should
    be the
    path to the ICC profile that will have calibration applied,
    re-applied
    or removed. The appropriate extension should be used for the
    platform, i.e. icm for
    MSWindows, and icc for OS X
    or
    Unix/Linux.
    
    outprof.icm 
should
    be the
    path to the file that will be created to hold the modified ICC
    profile.
    The appropriate extension should be used for the
    platform, i.e. icm for
    MSWindows, and icc for OS X
    or
    Unix/Linux.
    
    Discussion
    Applycal provides a means of
    using per channel calibration on devices and systems that don't
    explicitly support such calibration. Once a calibration has been
    created for a device (see printcal), it
    needs to be then used for all subsequent profiling and printing. If
    the
    printing device, display or system doesn't explicitly support the
    use of
    calibration, then the calibration can be applied during the printing
    of
    profile test charts using printtarg -K,
    or the reading of a display target using dispread -K, and then for
    processing imagery using cctiff
    or by modifying the device ICC profiles using applycal.
    
    Applycal modifies the
    appropriate input or output per-channel curves of the profile to
    incorporate the per-channel calibration. To allow the calibration to
    be
    re-applied or removed, it first makes a copy of the uncalibrated
    curves
    and stores them in private tags in the profile.
    
    NOTE that things like the
    white point, black point tag, gamut tag etc. are not adjusted to account
    for the calibration, nor does applycal read, add or change any
    'vcgt' tag (If a 'vcgt' tag is present and a calibration applied as
    well, then both will be in effect when such a profile is installed
    using typical display installation tools.)
    
    NOTE that any calibration
    embedded in the ICC profile 'targ'
    tag is ignored, since it is intended for computation of final
    calibrated device value ink limits, and may not represent the exact
    current calibration curves.