Fred Kuo :: Blog

二月 8, 2013

a Practice of WYSIWYG::by Number

Filed under: 色彩管理,Fogra — 標籤:, , , , , — Administrator @ 1:39 下午

WYSIWYG (What You See Is What You Get) is terminology that dated like 15 years ago when DTP just started. nothing new about it, but I haven’t seen anyone demonstrate the terminology in a more explicit way::by Number. So, here we are:

1. what you see on the LCD display (by Number via iOne) :
a. LCD (a Samsung F2830) Display calibration quality:         F2380Calibrate
b. What you see of the Fogra CMYK media wedge V2 after calibration (by number via iOne)

55.1 -37 -50 61.53 -23.67 -47.23 15.06
66.86 -24.73 -37.1 66.24 -25.22 -39.65 2.67
79.72 -12.53 -21.75 79.31 -12.89 -22.63 1.04
48 74 -3 48.99 75.87 -2.34 2.22
60.84 50.59 -6.74 60.12 52.23 -6.12 1.90
76.42 25.78 -6.91 75.99 26.46 -7.5 1.00
89 -5 93 92.52 -8.88 81.95 12.23
90.34 -4.7 62.56 90.19 -5.19 63.64 1.20
92.19 -3.47 31.15 92.61 -4.01 33.3 2.26
53.08 37.72 28.91 51.59 38.71 26.03 3.39
41.55 22.73 16.76 39.66 22.77 14.22 3.17
31.92 39.95 23.98 29.36 40.68 26.04 3.37
32.54 44.45 -1.8 30.6 45.06 -3.94 2.95
51.28 1.27 44.5 49.78 1.72 46.58 2.60
34.56 -36.44 13.86 33.58 -36.73 12.11 2.03
35.95 -26.19 -20.86 35.95 -23.43 -20.53 2.78
20.92 9.58 -23.65 20 5.81 -24.42 3.96
88.97 0 -1.85 89.24 -0.02 -1.88 0.27
82.79 0 -1.69 82.49 -0.23 -1.96 0.46
69.28 0 -1.35 68.89 -0.24 -1.32 0.46
54.4 0 -0.97 53.62 -0.44 -0.78 0.92
36.62 0 -0.52 35.54 0.6 -0.74 1.25
16 0 0 15.56 -1.4 0.02 1.47
24 22 -46 22.07 19 -46.59 3.62
40.88 17.88 -36.58 39.69 17.43 -35.8 1.49
63.69 10.33 -23.76 62.96 11.11 -25.86 2.36
47 68 48 47.21 70.31 50.41 3.34
58.5 47.1 37.88 57.69 49.04 37.51 2.13
74.18 22.92 21.37 73.6 23.73 21.72 1.06
50 -65 27 52.63 -55.61 27.92 9.79
62.13 -39.82 21.01 61.37 -41.65 21.51 2.04
76.97 -19.06 11.03 76.5 -20.29 11.79 1.52
71.22 18.85 17.25 70.79 19.28 17.67 0.74
71.24 22.15 73.08 72.67 23 67.51 5.81
47.74 71.2 16.24 48.56 73.61 16.17 2.55
38.01 55.38 -20.94 35.54 56.98 -21.89 3.09
73.66 -22.81 67.57 74.46 -23.42 65 2.76
52.33 -52.31 -20.15 57.37 -39.06 -17.78 14.37
43.34 -17.03 -48.62 45.85 -11.4 -47.6 6.25
95 0 -2 95.08 -0.02 -1.75 0.26
88.54 -0.38 -3.13 88.62 -0.64 -3.52 0.48
81.95 -0.89 -4.1 81.74 -1.33 -4.45 0.60
67.67 -1.96 -4.37 67.04 -1.54 -5.03 1.00
52.22 -2.48 -3.53 51.09 -1.64 -4.51 1.72
37.47 -3.86 -3.15 36.2 -3.78 -3.64 1.36
26.29 -6.81 -3.41 25.51 -10.24 -3.93 3.56
Max 15.06 Average 3.06
90% percentile 6.03 1.93

I got maximum delta-E of 15.06 and Average delta-E of 3.06, If I exclude out the most saturate patches (90% percentile), I got maximum delta-E of 6.03 and Average delta-E of 1.93.

2. What you get from a Epson 9890 print out (by Number via iOne).

55.1 -37 -50 54.25 -37.9 -49.68 1.28
66.86 -24.73 -37.1 65.37 -25.53 -36.45 1.81
79.72 -12.53 -21.75 77.48 -14.29 -21.43 2.87
48 74 -3 47.89 73.76 -2.52 0.55
60.84 50.59 -6.74 60.46 49.74 -7.14 1.01
76.42 25.78 -6.91 75.88 26.8 -7.46 1.28
89 -5 93 87.94 -5.88 91.97 1.72
90.34 -4.7 62.56 88.94 -5.88 62.13 1.88
92.19 -3.47 31.15 92.03 -5.28 30.1 2.10
53.08 37.72 28.91 52.6 36.5 26.48 2.76
41.55 22.73 16.76 40.54 18.07 13.17 5.97
31.92 39.95 23.98 31.85 39.51 23.73 0.51
32.54 44.45 -1.8 32.38 43.1 -4.46 2.99
51.28 1.27 44.5 49.46 -3.63 40.45 6.61
34.56 -36.44 13.86 33.66 -38.27 12.87 2.27
35.95 -26.19 -20.86 35.79 -26.74 -21.73 1.04
20.92 9.58 -23.65 21.54 7.83 -24.51 2.05
88.97 0 -1.85 89.15 -0.2 -2.69 0.88
82.79 0 -1.69 83.31 0.85 -2.95 1.61
69.28 0 -1.35 68.26 -1.95 -4.77 4.07
54.4 0 -0.97 52.93 -1.89 -3.62 3.57
36.62 0 -0.52 36.51 -1.25 -2.84 2.64
16 0 0 15.68 -0.82 -0.12 0.89
24 22 -46 22.59 21.31 -47.68 2.30
40.88 17.88 -36.58 39.7 16.03 -37.96 2.59
63.69 10.33 -23.76 62.7 9.57 -24.51 1.46
47 68 48 46.85 67.85 48.11 0.24
58.5 47.1 37.88 58.89 48.03 37.69 1.03
74.18 22.92 21.37 73.83 23.98 21.13 1.14
50 -65 27 49.95 -65.96 26.42 1.12
62.13 -39.82 21.01 61.29 -41.39 19.67 2.23
76.97 -19.06 11.03 75.96 -19.8 8.83 2.53
71.22 18.85 17.25 70.75 18.95 15.77 1.56
71.24 22.15 73.08 71.53 24.21 72.77 2.10
47.74 71.2 16.24 47.8 71.55 16.76 0.63
38.01 55.38 -20.94 38.05 54.24 -21.74 1.39
73.66 -22.81 67.57 72.84 -24.75 65.25 3.13
52.33 -52.31 -20.15 52.04 -53.1 -22.28 2.29
43.34 -17.03 -48.62 43.01 -16.97 -49.45 0.90
95 0 -2 94.04 0.14 -0.26 1.99
88.54 -0.38 -3.13 88.27 -0.83 -4.26 1.25
81.95 -0.89 -4.1 82.12 -0.42 -4.83 0.88
67.67 -1.96 -4.37 66.88 -2.56 -6.54 2.39
52.22 -2.48 -3.53 51.27 -3.62 -5.77 2.69
37.47 -3.86 -3.15 36.05 -4.37 -5.28 2.61
26.29 -6.81 -3.41 24.11 -7.38 -4.46 2.49
Max 6.61 Average 2.03
90% percentile 3.06 2.10

I got maximum delta-E of  6.61 and Average delta-E of 2.03, If I exclude out the most saturate patches (90% percentile), I got maximum delta-E of  3.06 and Average delta-E of 2.10.

 

How  it looks from the camera (through a Panasonic GX1, White point set at 5000K), light source as here.
LCD on the top and printout at the bottom.display2print

Comment:
The system works, I could keep the Samsung in an accurate position for the 90% percentile (of average 1.93), the most saturate part is just out of  its capability.
As for WYSIWYG from LCD to printout,  acceptable,  there is always leeway to fine tune.

 

n

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七月 21, 2011

Color by Number::軟打樣再探討 II

Filed under: 色彩管理,Fogra — 標籤:, , , , , , — Administrator @ 11:55 上午

前 一篇提到我的F2380 經由 DispcalGUI 的加持後,在色彩精準度上有不錯的數據呈現。但它足以擔任軟打樣的任務嗎?

首先我把軟打樣的工作定義先交代一下:
1.所謂軟打樣就是,以顯示器來預視印刷品的色彩。那首先必須把印刷品的色彩定義下來,我們直接取用國際標準 ISO-12647-2。取L=50色域如下:
image

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七月 15, 2011

Color by Number::軟打樣再探討

Filed under: 色彩管理,Fogra — 標籤:, , , , , , , — Administrator @ 9:48 上午

之前發過一篇軟打樣的報告,這次因DispcalGUI的新版本(0.7.0.7)多了一些功能,趁這個機會對軟打樣著個題目在工具能力及檢驗方式上作一些探討。

DsipcalGUI 增加的功能不少,我只提出幾個我比較在意的兩個部分:

1. log

image

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三月 11, 2010

軟打樣啟動 Take-1

Filed under: 色彩管理 — 標籤:, , , , , , , , , — Administrator @ 10:43 上午

數位打樣的軟體硬體都已經非常成熟,但達成的成本還是很高;怎麼樣操作能以最低花費來達成數位打樣的色彩品質?我會在其他篇幅交代。

這裡要談的是軟打樣(顯示器打樣)。我較少提到軟打樣的題目,相較於數位打樣都是反射稿的比對,能夠以較客觀的數據來呈現;軟打樣牽涉到跨媒體的比對及更嚴謹的是觀看環境的控制,跨媒體的比對在數據上很難做到像相同媒體比對一樣漂亮;觀看環境不對,即使顯示器本身的數據表現很好,視覺上一樣對不上來。同樣的,市面上支援軟打樣的軟硬體也蠻多的,先聲明我用不起8,9萬等級的EZIO顯示器!  同樣的宗旨:最低成本的達成能力在哪裡?

如前述,軟打樣的環境控制是非常嚴謹的,這裡將先排除環境因素,就顯示器本身的表現來評斷軟體打樣的能力。

要用哪顆顯示器?

最低成本的達成? 找顆最便宜的LCD就是了!  那也不盡然,總得有的能起碼的能力,又不能太貴;手邊有兩顆LCD,價格在都8,9K左右,我們就來看看萬元以下的LCD能不能拿來做軟打樣?

LCD #1,Samsung  2253lw。

image

LCD #2, Samsung F2380。

image

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