Digital BW, The Print

What's interesting about this data when plotted is that Epson appears to
have built in a degree of curvature into the response of the ABW driver.
It's as though they have built bpc into the lookup table based on their
standard printer, their inks and (each of) their papers....


> From: Steve Kale <stevekale@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Fri, 21 Oct 2005 19:47:00 +0100
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Conversation: [Digital BW] ICC v. Transfer Function in Epson driver
> Subject: Re: [Digital BW] ICC v. Transfer Function in Epson driver
> 
> Here is the results of sending 51-step data to my 4800 with Neutral/Darker,
> 2880, finest detail and the Epson Velvet Fine Art paper setting using HPR
> paper:
> 
>   
>  SampleID SAMPLE_NAME GRAY LAB_L LAB_A LAB_B
>  21 G3 100 14.73 0.31 0.51
>  19 G1 98 15.21 0.43 0.53
>  17 F2 96 15.97 0.48 0.6
>  15 E3 94 16.66 0.44 0.54
>  13 E1 92 17.65 0.28 0.35
>  11 D2 90 18.89 -0.03 0.05
>  9 C3 88 20.02 -0.24 -0.19
>  7 C1 86 21.27 -0.25 -0.34
>  5 B2 84 22.66 -0.23 -0.77
>  3 A3 82 24.29 -0.12 -0.87
>  1 A1 80 25.92 -0.01 -0.87
>  50 Q2 78 27.55 0.09 -0.73
>  48 P3 76 29.09 0.15 -0.46
>  46 P1 74 30.91 0.21 -0.35
>  44 O2 72 32.98 0.45 -0.25
>  42 N3 70 34.81 0.57 0.07
>  40 N1 68 36.7 0.61 0.02
>  38 M2 66 38.48 0.81 0.28
>  36 L3 64 40.12 0.86 0.25
>  34 L1 62 42.07 0.83 0.41
>  32 K2 60 43.84 0.89 0.53
>  30 J3 58 45.73 0.86 0.52
>  28 J1 56 47.35 0.89 0.61
>  26 I2 54 49.56 0.9 0.59
>  24 H3 52 51.3 0.97 0.6
>  22 H1 50 52.98 0.94 0.58
>  20 G2 48 54.8 0.96 0.5
>  18 F3 46 56.47 0.92 0.56
>  16 F1 44 58.32 0.87 0.62
>  14 E2 42 60.21 0.86 0.69
>  12 D3 40 62.03 0.81 0.76
>  10 D1 38 63.83 0.85 0.72
>  8 C2 36 66.05 0.74 0.81
>  6 B3 34 68.01 0.91 0.68
>  4 B1 32 69.88 0.74 0.67
>  2 A2 30 71.61 0.89 0.58
>  51 Q3 28 73.76 0.88 0.61
>  49 Q1 26 75.48 0.92 0.5
>  47 P2 24 77.41 0.94 0.46
>  45 O3 22 79.27 0.91 0.2
>  43 O1 20 81.21 0.95 -0.01
>  41 N2 18 83.12 0.94 -0.01
>  39 M3 16 84.9 0.9 -0.27
>  37 M1 14 86.59 0.88 -0.56
>  35 L2 12 88.09 0.83 -0.66
>  33 K3 10 89.74 0.91 -0.56
>  31 K1 8 91.4 0.85 -0.72
>  29 J2 6 93 0.89 -0.93
>  27 I3 4 94.62 0.86 -1.01
>  25 I1 2 96.26 0.85 -1.2
>  23 H2 0 97.7 0.79 -1.31
> 
> Specifically I printed the QTR-51-random tiff file, completely un-colour
> managed.