Optimising scanner profile generated with Argyll colprof.exe

ArgyIIcms 1.3.2
Assigned with the designated icc profile and converted to aRGB all in CS4.
RGB values were extracted with PM5.
ΔE was computed with PatchTool by comparing with the reference data.

Command:  colprof -v -qh -ax -kx scanner
where  -v            verbose
          -qh           quality high
          -ax           XYZ clut
          -kx           black generation with maximum K  *** see note
           scanner   input: scanner.it3 / output: scanner.icm

ΔE report:  max= 0.88 avg= 0.08
If quality is set to ultra (-qu),  max= 0.84 avg= 0.06

About colprof with option -ax
This creates cLUT profile using PCS of XYZ data better which offers better  accuracy for additive type devices (displays, scanners, cameras etc.) and it avoids clipping of values above the white point that can occur in L*a*b* based cLUT input profiles.

About colprof with option -s src.icc
+++ Does not seem to work

                           ΔE2000
                   average  90%     95%     max

Argyll (default)    1.06    1.93    2.32    5.63   ( -qm )
Argyll ( -qh   )    0.42    0.69    0.87    1.78  high quality
Argyll ( -qu   )    0.42    0.67    0.93    1.88  ultra quality


L values for White point & Black point
                
                          WP     BP
GS00/GS23 (reference)   92.41   2.98  (L values from reference) set

 -ax -kz                92.42   3.03
 -ax -kr                92.42   3.03
 -ax -kh                92.42   3.03
 -ax -kx                92.42   3.03

 -ag -kz                92.45   6.48
 -ag -kr                92.45   6.48
 -ag -kh                92.45   6.48
 -ag -kx                92.45   6.48

 -as -kz                92.19   4.18
 -as -kr                92.19   4.18
 -as -kh                92.19   4.18
 -as -kx                92.19   4.18

note: option -k only affects profile for output device.
[link]