The 
a intent, Absolute
      Colorimetric, is intended to reproduce colors exactly,
      irrespective of the white point of the each medium. This is done
      using CIECAM02 Jab appearance colorspace by forcing the source and
      destination to have a common white point (but other aspects of the
      individual viewing conditions are active), and colors are mapped
      directly from source to destination, clipping any out of gamut
      colors to the closest match. This is equivalent to the ICC 
Absolute Colorimetric intent,
      and is often used for proofing purposes. 
      
      
The 
aw
      intent, Absolute Colorimetric with scaling to fit white point, is
      very similar to the 
a
      intent, except that it will scale the source colorspace down in
      order to make sure that the source white point isn't clipped by
      the gamut of the destination. This might be used in some print
      proofing situations where the source white is lightly lighter than
      the destination white (as an alternative to using the 
-w flag), or it may be useful in some soft
      proofing situations where the differences in white point of the
      display destination would cause clipping of the source white
      point.  When the 
-v flag is on, the scaling
      factor used will be displayed during execution.
      
      
The 
aa
      intent, Absolute Appearance, simply maps the Jab colors directly
      from source to destination, clipping any out of gamut colors to
      the closest match. This attempts to match the exact appearance of
      colors as closely as possible, but may not exactly map the white
      point of the source to the destination, depending on how different
      the viewing conditions are.
      
      
The 
r
      intent is like Absolute Appearance mode, but maps the white point
      from source to destination precisely, and otherwise maps the Jab
      colors directly from source to destination, clipping any out of
      gamut colors to the closest match. This is equivalent to the ICC 
Relative Colorimetric intent.
      
      
The 
la
      intent, Luminance matched appearance, linearly compresses or
      expands the the luminance axis from white to black to match the
      source to the destination space, while not otherwise altering the
      gamut, clipping any out of gamut colors to the closest match. This
      is often useful for appearance based soft proofing.
      
      
The  
p
      intent, Perceptual, uses "knee" type 3 Dimensional compression to
      make the source gamut fit within the destination gamut. As much as
      possible, clipping is avoided, hues and the overall appearance is
      maintained. The white point is mapped precisely from source to
      destination.This is equivalent to the ICC 
Perceptual intent.
      
      
The  
pa
      intent, Perceptual Appearance uses "knee" type 3 Dimensional
      compression to make the source gamut fit within the destination
      gamut. As much as possible, clipping is avoided, hues and the
      overall appearance is maintained. The white point is
 not mapped from source to
      destination, allowing the apperance parameters to alter the
      chromatic mapping.
      
      
The  
lp
      intent, Luminance Preserving Perceptual Appearance uses
      compression to make the source gamut fit within the destination
      gamut, but very heavily weights the preservation of the Luminance
      value of the source, which will compromise the preservation of
      saturation. No contrast enhancement is used if the dynamic range
      is reduced. This intent may be of use where preserving the tonal
      distinctions in images is more important than maintaining overall
      colorfulness or contrast.
      
      
The 
ms
      intent, Saturation, uses 3 Dimensional compression and 
expansion to try and
      make the source gamut exactly match the destination gamut, and
      also favours higher saturation over hue or lightness preservation.
      The white point is mapped precisely from source to destination.
      
      
The 
s intent, Enhanced Saturation,
      uses the same basic gamut mapping as 
ms, Saturation, but increases saturation slightly
      in highly saturated areas of the gamut. This is equivalent to the
      ICC 
Saturation intent.
      The white point is mapped precisely from source to destination.
      
      
The 
al
      intent, Absolute Colorimetric (Lab), is similar to intent 
a, but 
L*a*b*
      colorspace is used rather than CIECAM02 Jab appearance space. This
      often leads to poor reproduction of blue and red hues, but can be
      useful as a reference mapping.
      
      
The 
ar
      intent, White Point Matched Colorimetric (Lab), is similar to
      intent 
r, but L*a*b*
      colorspace is used rather than CIECAM02 Jab appearance space. This
      often leads to poor reproduction of blue and red hues, but can be
      useful as a reference mapping.