gernot hoffmann color printer test · pdf filepurpose: page 4 demonstrates many features for...
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�
Gernot Hoffmann
CieLab-ValuesbyW.FaustIT8.7/2/R011220/Ref.D50/Brad-yes G.Hoffmann/November272004PostScript/sRGB/709primaries/whitepointD65/outofgamutmarkedbydot/graysequalizedR=G=B
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Table of Contents
1. Introduction 2
2. GeneralTestPage 4
3. IT8Target 5
4. CIELab/sRGBColorChart 8
5. CIELab/sRGBGrayscaleChart 9
6. GrayscaleConversions 12
7. Reflectance/Density/VisualDotArea 15
8. DotGain 17
9. BlackGeneration 19
10. Files 20
Color Printer Test Pages
SettingsforAcrobat
Edit/Preferences/General/PageDisplay(sinceversion6)
CustomResolution72dpi
Edit/Preferences/General/ColorManagement(fullversiononly)
sRGBEuroscaleCoatedorISOCoatedorSWOPGrayGamma2.2
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Purpose:page4demonstratesmanyfeaturesforallkindofcolorlaser,inkjetanddyesublimationprinters.Especiallyhelpfulfortestingaprintercalibration.
Printable area:pagealignmentandprintableareaareshownbythreeframes.
Gray balance:theRGBgraywedge1shouldbeprintedbyrichblackCMYK.Thiswedgeislinearbynumbers.At0.5wehaveR=G=B=128.Graywedge2(PostScript)shouldbeprintedbyK-only.Kislinearbynumbers.
Linearity and ink transition:smoothnessandlinearityofprimary inksCMYareshowntopleftbythreewedges.TransitionsofMagenta / LightMagentaandCyan/LightCyanforsix-color-printersarealsoshowntopleft.
Saturation:fullysaturatedcolorsonthefanandonthewheel.BlackL=0.0tomedi-umlightnessL=0.5andfromL=0.5toWhiteL=1.0.Hue,LightnessandSaturationaredefinedbytheHLScolorordersystem.LinearlycodedbynumbersinsRGB.
Ink limit:problemswithtoomuchinkareapparentattheblackendoftherichblackgraywedge,theblackpartsinthephotoandintheinklimitswatch300%.Dependingonthepaper,thetotalinklimitshouldnotbehigherthan300%or320%.
Black generation: Undercolor Removal UCR or Gray Component ReplacementGCRcanbetested.TheleftgrayportraitisRGBcodedandshouldbeprintedbyrichblack.Therightportraitisagrayscale,convertedfromtheRGBimageby20%dotgain.
General appearance:colorphoto,bottomlargeimage.
Rastered black text:textisprintedby100%,75%and50%K-only.
Color accuracy:pages5-7showanIT8scannertarget:page5codedbysRGBpage6byProPhotoRGBandpage7codedbyLab.ForsRGBsomecolorsareoutofgamut.ThesearemarkedbyadotandtheRGBvaluesareclipped.LoadinPhotoshopanypageinitsspecificcolorspaceandmeasu-reRGBandLabvalues.Thevaluesarecolorimetricallycorrectbutalittlerounded.Page8isusedsimilarly.
Gray accuracy:page9showsaCIELabgrayscalechart,codedbysRGB.ThiswillbeprintedmostlybyK-onlybecauseofaninternalinterpretationofR=G=B.Page10showsasimilarCIELabgrayscalechart.Bisalittlemodified.ThispageshouldbebeprintedalwaysbyCMYKrichblack,nearlyasneutralgray.Page11isdefinedasPostScriptgraphicwithvaluesK=0to100.
Grayscale conversions:chapter6.2showsseveralconversions.Images1to6aregrayscales,codedby1byteperpixel.Accordingtochapter8.1eachdotgaincanbereplacedbyanequivalentgamma.Images7and8areinCMYKwiththreeemptychannelsCMY,codedby4bytesperpixel.Animprovedworkflowisexplainedinchapter6.3.
�.� Introduction
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�.� Introduction
How to apply the test pages using a RIP (Raster Image Processor)
RGBsourcespace sRGB
CMYKsourcespace None
Destinationspace Actualprinterprofile
RenderingIntent RelativeColorimetric
Thisshouldshowallcomponentscorrectlyprinted.CMYKispassedthroughwithoutanychange.K-onlyshouldbeprintedbypureblack.
How to apply the test pages using Photoshop
Resumed
PrintingbyaRIPretainsallfeaturesofthetestpages.
PrintingbyPhotoshopshouldbedoneinRGBmode.Theresultiseasilyaffectedbywrongsettings.
Open document in CMYK working space
CMYKvaluesarecorrectlyindicated.RGBvaluesareconvertedtoCMYKusingtheactualcolorspaces.
ThismodecanbeusedforprintingbuttheRGBcomponentscannotbereproducedcorrectly.
Open document in RGB working space
RGBvaluesandLabvaluesarecorrectlyindicated.CMYKvaluesareconvertedtoRGBusingtheactualcolorspaces.K-onlycomponentsappearasrichblack(theCMYchannelsarenotempty).
ThismodecanbeusedforprintingbuttheCMYKcomponentscannotberepro-ducedcorrectly.
RGBcolorspace sRGB
CMYKspace EuroscaleCoated
Grayscale Gamma=2.2
Destinationspace Actualprinterprofile
RenderingIntent RelativeColorimetric
The settings for Acrobat (Reader)
Colorspaces sRGB/EuroscaleCoated/GrayGamma=2.2(seech.6.3)
Softproof Off
Thisdocumentdoesnothaveembeddedprofiles.
Thisdocumentdoeshaveaglobaloutputintent:sRGB.
Itshouldbeusedbynumbers.
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Nexttext75%black:Graywedge1shouldbeprintedbyrichblackCMYK.Graywedge2byK-only.Graywedge1hasalwaysatintuntiltheprinterisaccuratelycolorcalibrated.ThethreeCMYwedgesshouldbeprintedbypureinks.Nexttext100%black:SourceworkingspaceforRGBcomponentswassRGB.ArtefactsmayappearinthePDFpre-viewifSmoothLineArtisenabledinAcrobat.
CMYK
CM
YK
Ink
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it30
0%7
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0/60
/100
sRGBBMP-24
sRGBBMP-24
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0100100
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505000
050500
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000
10
000
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0.9
12
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sRGBBMP-24
CMY RGB K-only
GrayscaleDotGain
�CIELab-ValuesbyW.FaustIT8.7/2/R011220 G.Hoffmann/June172007PostScriptcodedbysRGB/D65/Outofgamutmarkedbydot
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CIELab-ValuesbyW.FaustIT8.7/2/R011220 G.Hoffmann/June172007PostScriptcodedbysRGB/D65/Outofgamutmarkedbydot
62.039.542.0
77.629.837.5
96.124.739.7
81.624.735.7
115.181.184.3
137.871.177.4
158.157.571.4
181.814.564.9
184.8163.8163.3
197.3159.8160.3
209.6155.1157.1
224.3149.5153.3
232.9235.8235.9
233.1230.8235.5
233.3235.5231.6
233.3229.8230.8
233.5229.9230.8
233.5235.6231.3
233.6230.3235.3
33.420.722.8
87.127.820.1
127.428.316.7
60.541.235.9
72.535.225.2
76.831.621.7
81.532.221.1
118.980.670.1
139.372.553.7
160.958.735.0
182.324.5
9.2
186.1164.6157.1
198.6160.6148.8
210.3157.1140.6
224.9151.3127.1
210.3231.1234.1
233.1216.9233.6
234.1233.6212.1
213.1212.3210.1
233.3212.8209.3
211.3228.8210.3
210.9212.1230.8
60.725.621.2
114.128.518.3
178.8117.9
97.966.054.242.0
72.551.429.1
81.853.222.6
75.650.523.1
152.6122.0
93.0
171.8116.6
56.5
187.6111.6
3.9
191.3109.0
0.0
198.3180.1162.8
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60.755.728.6
68.861.223.6
62.055.723.8
150.9140.8104.8
156.6141.1
68.3
159.1142.3
17.6
161.6141.3
0.0
204.9196.9177.3
209.9196.9154.5
213.8197.1135.6
223.6198.1
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157.8217.8228.3
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229.1173.8166.8
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98.3
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78.8
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55.4
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26.2
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12.7
166.3171.3151.6
161.8173.1137.9
158.6174.9122.6
136.9182.6
66.5
127.9209.6224.3
227.1161.6220.8
237.3225.6150.1
147.5146.6144.8
225.1154.6147.3
139.3200.8149.8
144.6151.8209.1
183.180.5
0.0
145.688.533.2
183.8121.9
74.521.838.932.0
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0.049.530.9
1.441.027.2
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238.5221.8126.9
126.9125.4123.9
220.1134.5125.6
114.5189.6129.5
122.9131.3199.5
158.6128.1
96.5
189.3137.1
87.9
194.6149.3108.9
25.649.247.9
0.052.949.9
0.059.255.7
0.053.951.0
63.494.993.5
24.399.695.0
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156.6172.6170.3
141.1175.8172.1
125.9179.1175.3
59.9186.6178.9
47.2190.5213.8
218.5122.0208.3
239.5217.9104.6
105.8105.5104.1
214.5115.9105.6
87.8177.8110.6
101.0110.8188.8
185.5149.1104.8
187.8145.8
76.5
225.1164.3
0.029.248.054.2
0.550.563.7
0.055.775.9
0.052.270.4
68.593.5
103.3
31.796.6
117.0
0.0103.9135.1
0.0107.1150.5
155.1171.6178.8
143.8173.8186.3
127.6176.3195.8
82.9182.1213.3
0.0181.1208.3
213.1101.0201.1
240.5213.8
80.5
88.187.586.9
208.396.887.3
61.0166.5
93.3
82.390.9
178.1
192.8166.1103.8
158.6149.6128.1
173.3164.6
83.349.255.973.0
36.456.491.3
12.356.2
109.5
0.056.7
134.1
97.3102.4116.6
91.0101.9133.8
82.1102.1149.1
52.2104.0180.3
167.6168.8178.8
165.3168.9187.1
161.8169.5196.3
152.3170.3215.9
0.0170.3201.6
207.679.8
193.6
240.8209.3
53.2
68.669.068.8
202.378.968.1
20.7153.9
75.3
61.971.1
166.3
184.9178.8102.5
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39.5
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37.028.970.0
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0.0159.1194.1
201.155.5
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195.159.248.7
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120.5174.8130.3
0.091.024.2
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101.618.1
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0.0132.5176.3
183.80.0
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17.217.217.2
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CodedbysRGBnumbers/Background118.9
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CIELab-ValuesbyW.FaustIT8.7/2/R011220 G.Hoffmann/June172007PostScriptcodedbyProPhotoRGB/D50
40.031.831.7
46.528.328.5
57.429.329.9
48.226.627.1
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105.559.056.2
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159.5149.1146.8
166.1147.1143.8
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226.1224.1224.9
226.3224.3224.8
228.6230.3226.1
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102.093.8
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146.9131.1
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177.1153.1
38.230.235.040.0
27.336.247.0
26.639.756.7
25.137.052.2
65.673.582.8
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169.3103.0179.8
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133.8131.8112.5
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153.5152.8170.3
153.3153.3179.6
152.6153.9200.3
97.4145.1183.8
160.387.6
170.5
205.9200.1
78.9
53.053.253.0
141.881.457.9
78.6126.9
70.8
71.058.5
139.9
158.3162.5
97.5
70.690.142.0
120.5147.8101.8
28.725.238.5
30.924.150.9
34.423.367.8
39.019.8
101.4
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80.667.3
112.5
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160.1149.8179.5
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151.372.9
160.8
203.5194.5
64.5
38.939.239.2
132.568.143.0
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56.5
57.943.2
126.9
123.9153.1117.5
39.767.529.2
21.230.721.3
48.738.951.7
57.536.563.2
64.532.475.5
67.830.881.0
91.679.894.0
100.376.5
106.5
108.172.4
118.1
131.161.9
152.6
159.6149.8161.5
166.1148.3168.9
170.6144.8177.1
183.8139.1198.1
71.6119.6164.9
141.658.7
149.9
200.3187.9
52.2
26.726.927.2
123.355.930.5
50.097.944.4
47.229.9
113.5
28.736.529.8
20.727.525.9
23.130.537.2
40.731.736.9
47.528.237.9
58.229.744.5
48.926.738.2
83.167.576.1
96.464.179.5
109.158.082.4
120.845.285.5
161.3149.6154.9
167.3147.1157.1
174.3144.8160.3
183.8140.1164.1
60.4105.3153.8
130.844.9
137.5
195.9178.9
40.7
16.716.917.5
112.944.719.7
37.581.532.7
38.218.299.4
15.316.218.2
18.216.519.9
28.220.724.2
230.5230.5230.5
208.5208.5208.5
194.6194.6194.6
181.3181.3181.3
169.3169.3169.3
156.5156.5156.5
143.1143.1143.1
131.1131.1131.1
119.5119.5119.5
109.5109.5109.5
97.997.997.9
88.388.388.3
78.878.878.8
69.569.569.5
61.261.261.2
52.052.052.0
45.245.245.2
38.538.538.5
31.831.831.8
26.226.226.2
20.820.820.8
18.318.318.3
15.615.615.6
14.514.514.5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
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CodedbyProPhotoRGBnumbers/Background99.6
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�CIELab-ValuesbyW.FaustIT8.7/2/R011220 G.Hoffmann/June152007PostScript/CIELabcoded/ReferencewhiteD50
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
A
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CIELab-ValuesbyW.FaustIT8.7/2/R011220 G.Hoffmann/June152007PostScript/CIELabcoded/ReferencewhiteD50
18.811.2
2.9
18.823.6
6.5
21.733.4
9.6
18.627.7
7.6
38.415.0
4.2
38.929.3
9.8
39.543.215.1
39.562.420.2
69.07.83.2
69.314.4
5.3
69.421.1
7.4
69.629.210.2
93.0-0.9-0.5
91.91.4
-2.0
92.9-1.31.6
91.51.4
-0.1
91.51.30.0
92.9-1.31.8
91.81.8
-2.0
8.46.91.2
20.127.520.3
28.541.933.9
18.88.67.2
18.917.214.9
18.721.217.2
19.722.919.2
38.415.513.0
39.027.724.5
39.742.237.2
39.759.751.0
69.37.26.9
69.413.211.8
69.518.716.7
69.626.524.6
90.1-6.7-3.9
88.47.9
-6.0
92.1-2.610.5
85.00.01.2
86.86.94.4
89.1-8.67.0
85.32.3
-9.4
14.417.211.5
25.737.529.3
55.722.821.3
23.73.99.7
23.57.6
17.9
25.210.724.2
23.69.4
21.8
53.79.2
20.6
54.017.941.4
54.726.360.9
54.528.965.5
74.54.7
11.3
74.68.4
20.3
74.512.329.7
74.916.841.0
86.91- 2.3-7.7
83.815.91- 0.9
91.4-3.419.6
77.00.51.3
81.513.7
7.6
85.11- 5.411.1
78.33.9
1- 6.7
11.27.55.9
47.732.935.4
62.516.518.8
23.5-0.89.1
23.3-1.117.7
25.9-0.723.9
23.5-0.820.7
58.7-0.420.7
58.9-1.140.4
59.2-2.459.7
59.0-1.268.1
79.80.4
11.0
79.8-0.223.2
79.9-0.433.0
80.1-2.382.9
83.11- 7.91- 1.6
79.323.71- 5.5
90.3-3.829.7
68.50.41.2
76.020.111.9
80.52- 2.115.6
71.35.2
2- 3.7
37.926.630.9
51.77.5
14.9
66.111.319.6
23.3-5.38.6
23.21- 0.516.7
26.11- 3.922.7
23.11- 1.918.9
43.2-7.613.9
43.41- 5.927.2
43.92- 4.740.9
43.72- 7.244.9
69.3-4.69.6
69.1-8.816.7
69.11- 2.624.8
69.12- 9.251.7
79.12- 3.21- 5.6
74.431.72- 0.1
89.4-3.838.5
60.90.01.1
70.826.515.1
75.62- 8.219.1
63.77.3
3- 0.5
47.540.057.7
43.520.840.7
57.021.235.9
13.9-8.92.2
13.91- 7.2
5.2
16.72- 2.9
6.7
13.71- 7.6
5.1
33.01- 3.0
4.5
33.22- 6.3
8.7
33.94- 0.714.4
33.75- 1.518.2
69.0-6.03.2
69.01- 1.4
4.7
69.01- 7.2
6.6
68.83- 7.412.4
75.12- 7.71- 9.3
69.339.72- 4.5
88.3-3.248.4
52.70.40.9
65.332.919.3
70.83- 3.922.7
56.29.7
3- 6.7
55.98.8
21.8
61.516.534.4
65.513.728.2
18.5-9.9-2.3
18.71- 9.1-3.4
20.62- 5.7-4.6
18.72- 2.9-4.3
37.71- 2.3-3.1
37.72- 4.1-4.3
38.73- 8.4-5.4
38.54- 9.2-8.4
69.3-6.1-0.8
69.01- 2.8-2.2
69.11- 8.7-4.0
68.93- 6.9-6.8
70.83- 2.02- 2.9
64.547.02- 8.2
87.1-2.357.4
44.5-0.10.8
60.238.723.7
65.63- 9.425.7
48.712.54- 2.9
64.49.8
28.7
63.510.642.5
71.814.687.3
18.5-6.4-6.5
18.61- 1.91- 3.0
20.11- 6.81- 8.9
18.61- 5.81- 7.5
37.9-7.7-8.8
37.71- 5.71- 7.8
38.92- 4.72- 6.9
39.23- 1.63- 6.0
69.0-4.8-5.8
69.0-8.51- 0.1
68.91- 3.11- 5.4
69.12- 3.22- 5.1
66.83- 5.52- 6.2
59.554.43- 1.7
86.0-1.166.4
37.20.20.4
55.244.527.7
60.94- 3.928.5
41.416.24- 8.4
69.54.0
35.9
62.20.8
12.6
67.0-5.042.7
23.30.7
1- 1.7
23.30.9
2- 3.7
23.22.5
3- 5.7
23.55.3
5- 0.9
43.20.4
-8.8
43.21.9
1- 9.2
43.22.2
2- 8.3
43.52.5
4- 6.4
69.31.0
-5.3
69.41.4
-9.8
69.51.4
1- 4.7
69.51.4
2- 5.5
62.43- 8.42- 9.2
54.960.93- 4.7
84.80.4
74.8
29.2-0.20.1
50.749.532.9
55.94- 8.231.2
33.920.25- 3.5
72.0-5.739.5
43.92- 2.635.5
65.02- 5.124.6
13.76.8
1- 3.2
13.613.32- 4.8
14.120.73- 8.4
13.936.06- 3.5
38.25.9
-9.9
38.211.31- 9.2
37.916.72- 9.2
37.529.35- 1.5
69.43.8
-5.3
69.46.3
-9.6
69.39.4
1- 4.9
69.515.02- 5.5
57.94- 0.53- 2.0
50.466.93- 7.2
83.42.5
83.5
21.7-0.3-0.2
46.254.238.5
50.55- 1.933.5
26.525.15- 8.2
66.62- 5.616.9
32.93- 6.529.8
15.01- 6.1
8.223.213.2-9.1
24.126.71- 7.5
24.239.22- 6.9
24.544.03- 0.7
43.212.3-7.7
43.524.21- 5.9
43.535.42- 3.3
44.763.24- 2.4
69.38.1
-5.0
69.514.5-8.7
69.320.91- 3.7
69.435.72- 4.7
53.24- 1.53- 4.7
45.772.33- 8.9
81.65.0
91.1
14.1-0.4-0.5
41.958.443.7
44.55- 4.534.5
19.630.96- 1.5
18.81- 2.2
4.9
13.31- 1.4-0.3
15.21- 0.8-9.3
18.912.6-2.4
18.925.6-3.4
21.934.5-4.8
18.728.7-4.1
38.516.3-3.0
39.531.8-3.8
39.948.0-5.1
38.967.5-9.0
69.49.3
-1.1
69.415.9-2.4
69.622.7-3.7
69.533.4-5.9
47.74- 0.23- 7.5
40.976.13- 9.9
79.48.4
97.8
6.9-0.4-0.7
37.461.048.9
37.95- 4.534.5
13.037.56- 3.5
6.2-1.3-2.8
6.93.3
-4.0
11.512.0-1.2
93.10.00.0
86.80.00.0
82.50.00.0
78.50.00.0
74.80.00.0
70.50.00.0
66.00.00.0
61.90.00.0
57.70.00.0
53.90.00.0
49.20.00.0
45.40.00.0
41.20.00.0
37.20.00.0
33.20.00.0
28.70.00.0
25.10.00.0
21.20.00.0
17.20.00.0
13.60.00.0
9.80.00.0
7.90.00.0
5.90.00.0
5.20.00.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
A
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CodedbyLabnumbers/BackgroundL=50
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0152255
0149255
0146255
0143255
0140255
0136255
0132255
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9491255
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16540255
1840255
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0131255
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15475255
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0145204
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0147186
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251025
601440
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251380
641350
871310
1061270
1231230
1381170
1521110
1661050
179970
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204750
216600
228350
24000
25100
601440
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291380
661350
891310
1071270
1241230
1391170
1531110
1661050
179960
192870
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216590
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24000
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321380
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-100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100
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-90
-80
-70
-60
-50
-40
-30
-20
-10
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10
20
30
40
50
60
70
80
90
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
a*
b*
L*=50709primariesWhite D65ReferenceD50Bradford yesGamma sRGBDotmarkforoutofgamutClippingforR-Y-G-C-B-MhexagonOuterblueareahumangamut
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-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
a*
b*
L*=50709primariesWhite D65ReferenceD50Bradford yesGamma sRGBDotmarkforoutofgamutClippingforR-Y-G-C-B-MhexagonOuterblueareahumangamut
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Black Curveforgammaencoded valuesC’=RGB’forsRGBGreen Linearfunction,comparisonBlue Curveforvalueswithoutgamma encodingC =RGBGray Density
Gammaencodedvaluesareindicatedbyanapostrophonlyonthispage
TheToneReproductionCurve(TRC)fromL*toC’issurprisinglynearlylinear
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Bottomright:RGBgraywedge,linearbynumbers
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40 94.2 41 96.7 42 99.1 43 101.5 44 104.0 45 106.5 46 108.9 47 111.4 48 113.9 49 116.4 50 118.9
50 118.9 51 121.4 52 124.0 53 126.5 54 129.1 55 131.6 56 134.2 57 136.8 58 139.4 59 142.0 60 144.6
60 144.6 61 147.2 62 149.8 63 152.4 64 155.1 65 157.7 66 160.4 67 163.0 68 165.7 69 168.4 70 171.1
70 171.1 71 173.8 72 176.5 73 179.2 74 181.9 75 184.6 76 187.3 77 190.1 78 192.8 79 195.6 80 198.3
80 198.3 81 201.1 82 203.9 83 206.7 84 209.5 85 212.3 86 215.1 87 217.9 88 220.7 89 223.5 90 226.3
90 226.3 91 229.2 92 232.0 93 234.9 94 237.7 95 240.6 96 243.5 97 246.3 98 249.2 99 252.1 100 255.0
L*0
RGB’
255
RGB
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Dens
0 20 40 60 80 100
0 0.0 1 3.6 2 7.3 3 10.9 4 14.1 5 16.8 6 19.3 7 21.5 8 23.5 9 25.5 10 27.5
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20 48.3 21 50.5 22 52.7 23 54.9 24 57.1 25 59.3 26 61.5 27 63.8 28 66.1 29 68.3 30 70.6
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50 118.9 51 121.4 52 124.0 53 126.5 54 129.1 55 131.6 56 134.2 57 136.8 58 139.4 59 142.0 60 144.6
60 144.6 61 147.2 62 149.8 63 152.4 64 155.1 65 157.7 66 160.4 67 163.0 68 165.7 69 168.4 70 171.1
70 171.1 71 173.8 72 176.5 73 179.2 74 181.9 75 184.6 76 187.3 77 190.1 78 192.8 79 195.6 80 198.3
80 198.3 81 201.1 82 203.9 83 206.7 84 209.5 85 212.3 86 215.1 87 217.9 88 220.7 89 223.5 90 226.3
90 226.3 91 229.2 92 232.0 93 234.9 94 237.7 95 240.6 96 243.5 97 246.3 98 249.2 99 252.1 100 255.0
L*0
RGB’
255
RGB
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Dens
0 20 40 60 80 100
�0
0 0.3 1 4.0 2 7.6 3 11.3 4 14.4 5 17.2 6 19.6 7 21.8 8 23.8 9 25.8 10 27.8
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20 48.6 21 50.8 22 53.0 23 55.2 24 57.4 25 59.6 26 61.9 27 64.1 28 66.4 29 68.7 30 71.0
30 71.0 31 73.3 32 75.6 33 77.9 34 80.3 35 82.6 36 85.0 37 87.4 38 89.8 39 92.2 40 94.6
40 94.6 41 97.0 42 99.4 43 101.9 44 104.3 45 106.8 46 109.3 47 111.7 48 114.2 49 116.7 50 119.2
50 119.2 51 121.8 52 124.3 53 126.8 54 129.4 55 132.0 56 134.5 57 137.1 58 139.7 59 142.3 60 144.9
60 144.9 61 147.5 62 150.1 63 152.7 64 155.4 65 158.0 66 160.7 67 163.3 68 166.0 69 168.7 70 171.4
70 171.4 71 174.1 72 176.8 73 179.5 74 182.2 75 184.9 76 187.7 77 190.4 78 193.1 79 195.9 80 198.7
80 198.7 81 201.4 82 204.2 83 207.0 84 209.8 85 212.6 86 215.4 87 218.2 88 221.0 89 223.8 90 226.7
90 226.7 91 229.5 92 232.3 93 235.2 94 238.1 95 240.9 96 243.8 97 246.7 98 249.6 99 252.4 100 255.3
L*0
RGB’
255
RGB
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Dens
0 20 40 60 80 100
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
�.� CIELab / sRGB Rich Gray Chart
ThegraychartonthepreviouspageisprintedeitherbyK-onlyorbyrichblackCMYK.DesktopprintersprintmostlybyK-only.
TheprintercanbeforcedtoprintbyrichblackCMYKifthevaluesRGBareslightlydifferent.Herewehaveadded1unitof255totheBchannel.Thegrayisnotaccu-ratebutgoodenoughforagraybalancetest.
��
�.� K-only Gray Chart
0 1 2 3 4 5 6 7 8 9 10
10 11 12 13 14 15 16 17 18 19 20
20 21 22 23 24 25 26 27 28 29 30
30 31 32 33 34 35 36 37 38 39 40
40 41 42 43 44 45 46 47 48 49 50
50 51 52 53 54 55 56 57 58 59 60
60 61 62 63 64 65 66 67 68 69 70
70 71 72 73 74 75 76 77 78 79 80
80 81 82 83 84 85 86 87 88 89 90
90 91 92 93 94 95 96 97 98 99 100
L*0
RGB’
255
RGB
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Dens
0 20 40 60 80 100
0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
APostScriptprintershouldprintthesechartsbyK-only.Thepatchescanbeusedtomeasurethedotgain.
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�.� Grayscale Conversions
AcolorimagescontainsadditionallyapatchwhichisfilledinPhotoshopinsRGBmodebyRGB=128/128/128.Theimageisthenconvertedtograyscalebyseveraldifferentdotgains.Theimagedoesnotchangetheappearance.IfwechooseinthecolorsettingsthesameGrayGamma2.2asastandard,thenthenewlyloadedimageswilllookdifferent.Thenextpageshowstheconvertedimagesincludingthepatchtopright.ThelargenumberinthepatchisthegraynumberaftertheconversionasmeasuredbyPhoto-shop.R=G=B=128isequivalenttoL*=54inthegraycharts.
GrayscalesbyPhotoshopshouldbesavedbyoneoftheseformats-EPSwithoutPostScriptcolormanagement,with8-bitTIFFpreview-K-onlyCMYKTIFFcancauseshiftsbyExporttoPDFinPageMaker6.52and7.01.ExporttoPDFbyPageMaker6.52shouldbedoneinmodeCMYK.ThisdoesnotaffectRGBimages.VectorgraphicsshouldbedefinedbyCMYKanyway.
ForoffsetprintingbyK-onlywehave touseanappropriatedotgain,as recom-mendedbytheserviceprovider /printer.Theimages7and8(nextpage)showtwoversions,executedbymodifiedprofileswithBlackGeneration=Maximum(emptyplatesCMY)ColorsettingsforExporttoPDF:
Thegrayscaleconversionsworkasfollows:1.RemovegammaencodingforsRGB. Thisisessentiallyapowerfunctionwithgammag1=2.2. Thenumbersareconvertedbyc2=c1
g1.2.Applydotgainencoding. Eachdotgainhasanequivalentgammavalueg2(simplifiedmodel). Thenumbersareconvertedby c3=c2
1/g2.3.Altogetherwegetnewnumbersc3=c1
g1/g2
ForGrayGamma=2.2weget c3=c1.
Dotgain%GammaR=G=B 0 1.00 55 10 1.32 80 15 1.51 93 20 1.74 105 25 2.00 118 28.2 2.20 128 30 2.32 132EC 104 BlackInkEuroscaleCoatedv2
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1.GrayscaleDG=10%
�.� Grayscale Conversions / Saved as EPS
2.GrayscaleDG=15% 3.GrayscaleDG=20%
4.GrayscaleDG=25% 5.GrayscaleDG=30% 6.GrayscaleBlackInk-EuroscaleC.v2
�0 �� �0�
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7.Left:CMYKK-onlyBlackInk-EuroscaleCoatedv2CMYKwiththreeemptyplatesCMYCodedbyfourbytesperpixelExecutedbyEurostandard CoatedDotgain=9%BlackGeneration=Maximum
8.Right:CMYKK-onlyBlackInk-EuroscaleCoatedv2CMYKasaboveExecutedbyEurostandardCoatedDotgain=15%BlackGeneration=Maximum(notavailableforEuroscaleCoated)
ThegrayscalesweresavedasEPS.PageMaker’sExporttoPDFinCMYKmoderetainsCMYKnumbersandRGBnumbersand graynumbersingrayscales.
��
�.� Grayscale K-only Printing / PDF/X-�a
Thischapterdescribesaworkflowwhichisentirelybasedononeoffsetprofile,hereforinstanceISOCoated.ThedescriptionfollowsAdobeCS2withAcrobat7Profes-sional.
DefinecolorsettingsinPhotoshop:RGB sRGB(forinstance)CMYK ISOCoatedGray BlackInkISOCoated(byloadingISOCoated)Spot Dotgain20%Saveas sRGB-ISO-ISO-20.csf
SynchronizationbyBridgedeliversinInDesign:RGB sRGBCMYK ISOCoatedGray Undefined(probablygamma=2.2)Spot Undefined
ManualsynchronizationforAcrobatdelivers:RGB sRGBCMYK ISOCoatedGray BlackInkISOCoatedSpot Undefined
ImageprocessingbyPhotoshop:ColorimageModeGrayscaleMakenewdocinCMYKwithwhitebackgroundandthesamesizebypixelsColormanagement:UseISOCoated(thepurposeisnotclear,butnotwrong)Grayscale:Selectall,CopyCMYK:PasteintochannelKSaveCMYKasuncompressedTIFF,withoutembeddingtheICCprofile
WorkflowinInDesign:MakedocumentPlaceTIFFSaveasPDF/X-1a,withmodifiedjoboptions:Downsampleto288dpiifabove/ZIP8bitsperchannel/LeavecolorunchangedUseRenderingIntentISOCoated(thisismerelyaninformation)NowwehaveaPDF/X-1acompliantPDF.PureCMYK,butthechannelsCMYareempty,whichshouldbetoldtothepresspeople.TheviewingconditionsinPhoto-shop,InDesignandAcrobatareconsistentlydefinedbyCMYK.Anexampleforfilesize:Grayscale458kB,CMYK1832kB,ZIP8-PDF519kB.ThecompressionratioisnotgoodforZIP-8,butemptychannelsdonotcontributemuchtofilesize.
��
�.� Reflectance / Density / Visual Dot Area
ThetableonthenextpageshowsthedensityD,thereflectancefactorR,theCIE1931luminanceY,theLablightnessL*andthevisualdotareaAfordifferentblackdensitiesDb.
Allthisisvalidforassumedidealconditions:
DensityD ReflectanceR CIEY LabL*Darkness infinite 0 0 0Paperwhite 0 1 100 100
InmatrixcalculationstherangeforYis0to1.Herewehave,asinmanyprograms,therange0to100.Hence,YismerelyRmultipliedby100.
ThevisualdotareaAiscalculatedbytheMurray-Daviesmodel.
TonerprintersmayhaveblackatD=1.5.OffsetandinkjetdensitiescanbeaboveD = 2.
Calculation
D R
R
Y R
A
Y R if R
D
D
Db
= −
==
= −−
= >
−
−
−
log( )
10
100
1 10
1 10
011 3 ..
. /
*
008856
7 787 16 116
116 161
1
Y R else
L Y
= +
= −
Linearizattion for L*< 8
D
L R
L Y
>==
2 0528
903 29
9 03
.
* .
* .
��
Dens.D Refl.R CIEY LabL* AreaA AreaA AreaA AreaA AreaA AreaA AreaA AreaA0...2.8 0...1 0...100 0...100 Db=1.4 Db=1.6 Db=1.8 Db=2.0 Db=2.2 Db=2.4 Db=2.6 Db=2.82.8000 0.0015 0.15 1.43 1.00002.7500 0.0017 0.17 1.60 0.99982.7000 0.0020 0.20 1.80 0.99952.6500 0.0022 0.22 2.02 0.99932.6000 0.0025 0.25 2.26 1.0000 0.99902.5500 0.0028 0.28 2.54 0.9996 0.99872.5000 0.0031 0.31 2.85 0.9993 0.99842.4500 0.0035 0.35 3.20 0.9989 0.99802.4000 0.0039 0.39 3.59 1.0000 0.9985 0.99762.3500 0.0044 0.44 4.03 0.9995 0.9980 0.99712.3000 0.0050 0.50 4.52 0.9989 0.9974 0.99652.2500 0.0056 0.56 5.08 0.9983 0.9968 0.99592.2000 0.0063 0.63 5.70 1.0000 0.9976 0.9961 0.99522.1500 0.0070 0.70 6.39 0.9992 0.9968 0.9954 0.99442.1000 0.0079 0.79 7.17 0.9983 0.9960 0.9945 0.99362.0500 0.0089 0.89 8.05 0.9973 0.9950 0.9935 0.99262.0000 0.0100 1.00 8.99 1.0000 0.9962 0.9939 0.9924 0.99151.9500 0.0112 1.12 9.97 0.9987 0.9950 0.9927 0.9912 0.99031.9000 0.0125 1.25 10.98 0.9973 0.9936 0.9913 0.9898 0.98891.8500 0.0141 1.41 12.04 0.9958 0.9921 0.9898 0.9883 0.98741.8000 0.0158 1.58 13.13 1.0000 0.9940 0.9904 0.9880 0.9866 0.98571.7500 0.0177 1.77 14.27 0.9980 0.9921 0.9884 0.9861 0.9846 0.98371.7000 0.0199 1.99 15.46 0.9958 0.9899 0.9862 0.9839 0.9825 0.98161.6500 0.0223 2.23 16.69 0.9933 0.9874 0.9838 0.9815 0.9800 0.97911.6000 0.0251 2.51 17.97 1.0000 0.9905 0.9847 0.9810 0.9787 0.9773 0.97641.5500 0.0281 2.81 19.30 0.9968 0.9874 0.9816 0.9779 0.9757 0.9742 0.97331.5000 0.0316 3.16 20.68 0.9933 0.9839 0.9781 0.9745 0.9722 0.9708 0.96991.4500 0.0354 3.54 22.11 0.9893 0.9800 0.9742 0.9706 0.9683 0.9669 0.96601.4000 0.0398 3.98 23.60 1.0000 0.9849 0.9756 0.9698 0.9662 0.9640 0.9626 0.96171.3500 0.0446 4.46 25.15 0.9949 0.9799 0.9707 0.9649 0.9613 0.9591 0.9577 0.95681.3000 0.0501 5.01 26.76 0.9892 0.9743 0.9651 0.9594 0.9559 0.9536 0.9522 0.95131.2500 0.0562 5.62 28.44 0.9828 0.9680 0.9589 0.9532 0.9497 0.9475 0.9461 0.94521.2000 0.0631 6.31 30.18 0.9757 0.9610 0.9519 0.9463 0.9428 0.9406 0.9392 0.93831.1500 0.0708 7.08 31.98 0.9677 0.9531 0.9441 0.9385 0.9351 0.9329 0.9315 0.93061.1000 0.0794 7.94 33.86 0.9587 0.9442 0.9353 0.9298 0.9264 0.9242 0.9228 0.92201.0500 0.0891 8.91 35.81 0.9486 0.9343 0.9255 0.9200 0.9166 0.9145 0.9131 0.91231.0000 0.1000 10.00 37.84 0.9373 0.9231 0.9144 0.9090 0.9057 0.9035 0.9022 0.90140.9500 0.1122 11.22 39.94 0.9246 0.9106 0.9020 0.8967 0.8934 0.8913 0.8900 0.88920.9000 0.1259 12.59 42.13 0.9103 0.8966 0.8881 0.8829 0.8796 0.8776 0.8763 0.87540.8500 0.1412 14.12 44.41 0.8943 0.8808 0.8725 0.8674 0.8641 0.8621 0.8609 0.86010.8000 0.1584 15.84 46.77 0.8764 0.8631 0.8550 0.8500 0.8468 0.8448 0.8436 0.84280.7500 0.1778 17.78 49.23 0.8562 0.8433 0.8354 0.8304 0.8273 0.8254 0.8242 0.82340.7000 0.1995 19.95 51.78 0.8336 0.8211 0.8133 0.8085 0.8055 0.8036 0.8024 0.80170.6500 0.2238 22.38 54.43 0.8083 0.7961 0.7886 0.7839 0.7810 0.7792 0.7780 0.77730.6000 0.2511 25.11 57.19 0.7798 0.7681 0.7608 0.7563 0.7535 0.7518 0.7506 0.75000.5500 0.2818 28.18 60.05 0.7479 0.7366 0.7297 0.7254 0.7227 0.7210 0.7199 0.71930.5000 0.3162 31.62 63.03 0.7121 0.7013 0.6947 0.6906 0.6881 0.6865 0.6854 0.68480.4500 0.3548 35.48 66.12 0.6719 0.6618 0.6555 0.6517 0.6492 0.6477 0.6468 0.64620.4000 0.3981 39.81 69.33 0.6268 0.6174 0.6115 0.6079 0.6057 0.6043 0.6034 0.60280.3500 0.4466 44.66 72.67 0.5762 0.5675 0.5622 0.5589 0.5568 0.5555 0.5547 0.55410.3000 0.5011 50.11 76.14 0.5194 0.5116 0.5068 0.5038 0.5019 0.5008 0.5000 0.49960.2500 0.5623 56.23 79.74 0.4558 0.4489 0.4447 0.4420 0.4404 0.4394 0.4387 0.43830.2000 0.6309 63.09 83.49 0.3843 0.3785 0.3749 0.3727 0.3713 0.3705 0.3699 0.36960.1500 0.7079 70.79 87.38 0.3041 0.2995 0.2967 0.2950 0.2939 0.2932 0.2927 0.29250.1000 0.7943 79.43 91.43 0.2142 0.2109 0.2089 0.2077 0.2069 0.2064 0.2061 0.20600.0500 0.8912 89.12 95.63 0.1132 0.1115 0.1105 0.1098 0.1094 0.1091 0.1090 0.10890.0000 1.0000100.00 100.00 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
�.� Reflectance ... / Table
��
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0CMYKInput
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
CM
YK
Prin
ted
1.02.03.0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0G0
5
10
15
20
25
30
35
40
45
50
%
dgG dg
1.00 0.01.10 3.31.20 6.51.30 9.41.40 12.11.50 14.61.60 17.01.70 19.21.80 21.31.90 23.22.00 25.02.10 26.72.20 28.22.30 29.72.40 31.12.50 32.32.60 33.52.70 34.62.80 35.62.90 36.63.00 37.5
G dg
1.00 0.01.07 2.51.15 5.01.23 7.51.32 10.01.42 12.51.51 15.01.62 17.51.74 20.01.86 22.52.00 25.02.15 27.52.32 30.02.51 32.52.74 35.03.00 37.5
�.� Dot Gain
Thisdiagramshows thegrowthoftheareaofprinteddotsonthepaper.Aprintertonereproductioncurveisoftensimilartoapowerfunc-tion, like the so-called Gammafunctionforamonitor,butshownsomewhatmirrored.ForGamma=2.0wereadfortheinput0.50(50%)theoutputvalue0.75whichisinterpretedasdotgain25%.AccordingtoISOthedotgainhastobemeasuredat40%.Photoshopseemstouse50%.
AgrayprofilecanbederivedfromacolorCMYKprofile.ButitseemsthatthedotgainisdifferentforrichblackandK-only.
x
y
Formulas
y x
y x
At x
dg y x x
dg x
G
G
o
o o
oG
( ) ( )
( )
( )
( )
1 1
1 1
1 1
− = −
= − −
= −
= − − − xx
For x
left diagram table
dg
For x
dg
o
o
G
o
=+
= −
=
= −
0 5
0 5 0 5
0 4
0 6
.
( )
. .
.
. 00 6
100
.
%
G
Multiply dg by
ThelowerdiagramshowsthedotgainasafunctionofGamma.
��
�.� Dot Gain
Thisdiagramshowstheden-sityDandthevalueKasfunc-tionsoftheCIELablightness.
ThefunctionK(L*)isbasedonmeasurementsL*inaswatchbookforEuroscaleCoatedv2.
A simple quadratic functionwasusedforcurvefitting.
L*= 0meansdarknessL*=100 meanspaperwhite
L*0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
D
0
10
20
30
40
50
60
70
80
90
100
K
0 20 40 60 80 100
L L
K L L
=
= − −
* /
( . . . )
100
100 1 125 0 5 0 625 2
��
�. Black Generation
Black Generation means the strategyhowtoreplaceCMYinkbyKinkindarkareas.UCR(UndercolorRemoval):Equalamountsofcolor inkarereplacedbyKinkinneutralareas.GCR (Gray Component Replacement):EqualamountsofcolorinkaboveacertainlevelarereplacedbyKinkeverywhere.
ThecurveswerecreatedbyGretagMac-bethProfileEditor,modeGraybalance:’TheGrayBalancewindowindicatesthecurveof theLab lightnessaxis foreachcolor channel.The L* range (Lightnessaxis)isindicatedfrom0to100.Thiscannotbetrue.Atleastaretheaxesinreversedirection.
EuroscaleCoatedv2usesmediumGCR,ISO Coated uses heavy GCR and theinkjetwasprofiled for lightGCR.This isnecessaryinordertoavoidtheso-calledpeppereffect.StrongerGCRstabilizesthegraybalance.Names (characterizations) like medium,heavyorlightarenotstandardized.OffsetProfileISOCoated
InkjetProfileforMutoh6100
OffsetProfileEuroscaleCoated
�0
�0. Files
Thisdocumentisavailableintwoversions:
WebPreview/about300kB
http://docs-hoffmann.de/a3gencolortest.pdf
HighQualityJPEG/ZIP144dpi/about2MB
http://docs-hoffmann.de/a3gencolorhigh.pdf
EPSfilefortheIT8target50kB
http://docs-hoffmann.de/targetrgb.txt
Pleaserenametotargetrgb.eps
Thisdocument
http://docs-hoffmann.de/a3gencolorhigh.pdf
wastestedbyPrinters
QMS6100Magicolor
FargoPictura310e
Lexmark4079plus
MutohRJ6100
OkidataC9600
EpsonStylosPro7890
andRIPs
PosterShopPro
BestColorproof
ColorGateProductionServer
GernotHoffmannAbout2002-February03/2013
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