Vuescan Output Optimization

Vuescan: ver 9.0.19
Scanner: Epson V500
Mode: Reflective

                                              ΔE2000
 Color      Curve      Custom                              
Balance   Low - High    icc   Output  ave   90%   95%   max

None       default      No     aRGB   8.04 10.24 10.78 13.87  refer to fig.2
Neutral    default      No     aRGB   4.73  6.97  8.53 10.63
None       default      Yes    aRGB   5.57  6.85  7.09  9.33
Neutral    default      Yes    aRGB   4.36  5.82  6.34  7.18

None      0.10 0.25     Yes    wide   2.84  5.08  5.85  6.76  refer to fig.3
None      0.18 0.58     Yes    aRGB   2.60  4.74  5.42  6.82  refer to fig.4

Raw data was assigned Monaco profile
in CS4 and converted to aRGB with
a)  Absulute rendering intent         0.39  0.72  0.89  4.38
b)  Perceptual rendering intent       1.78  2.27  2.32  4.02

Epson generic reflective profile      2.15  3.39  3.93  5.77
    assigned in CS4


1) Reference data in Lab values

Figure 1

2) No optimization

Figure 2

3) Custom icc, fine tuned curve low and high, output with wide gamut RGB color space.

Figure 3

4) Custom icc, fine tuned curve low and high, output with wide Adobe RGB color space.

Figure 4