Gernot Hoffmann Color Printer Test Pages

1 Gernot Hoffmann cielab -Values by / R011220 / / Brad-yes / November 27 2004 PostScript / sRGB / 709 primaries / whitepoint D65 / out of gamut marked by dot / grays equalized R=G=B12345678910 11 12 13 14 15 16 17 18 19 20 21 2212345678910 11 12 13 14 15 16 17 18 19 20 21 22 ABCDEFGHIJKLABCDEFGHIJKLT able of Contents 1. Introduction 2 2. General Test Page 4 3. IT8 Target 5 4. cielab / sRGB Color Chart 8 5. cielab / sRGB Grayscale Chart 9 6. Grayscale Conversions 12 7. Reflectance / Density / Visual Dot Area 15 8. Dot Gain 17 9. Black Generation 19 10. Files 20 Color Printer Test PagesSettings for AcrobatEdit / Preferences / General / Page Display (since version 6) Custom Resolution 72 dpiEdit / Preferences / General / Color Management (full version only)sRGBE uroscaleCoated or ISOC oated or SWOPGrayGamma Purpose: page 4 demonstrates many features for all kind of Color laser, inkjet and dye sublimation printers.

2 Especially helpful for testing a Printer area: page alignment and printable area are shown by three balance: the RGB graywedge 1 should be printed by rich black CMYK. This wedge is linear by numbers. At we have R=G=B=128. Graywedge 2 (PostScript) should be printed by K-only. K is linear by and ink transition: smoothness and linearity of primary inks CMY are shown top left by three wedges. Transitions of Magenta / LightMagenta and Cyan/Light Cyan for six- Color -printers are also shown top : fully saturated colors on the fan and on the wheel. Black L= to medi-um lightness L= and from L= to White L= . Hue, Lightness and Saturation are defined by the HLS Color order system.

3 Linearly coded by numbers in sRGB. Ink limit: problems with too much ink are apparent at the black end of the rich black graywedge, the black parts in the photo and in the ink limit swatch 300%. Depending on the paper, the total ink limit should not be higher than 300% or 320%. Black generation: Undercolor Removal UCR or Gray Component Replacement GCR can be tested. The left gray portrait is RGB coded and should be printed by rich black. The right portrait is a grayscale, converted from the RGB image by 20% dot gain. General appearance: Color photo, bottom large image. Rastered black text: text is printed by 100%, 75% and 50% accuracy: Pages 5-7 show an IT8 scanner target: page 5 coded by sRGB page 6 by ProPhotoRGB and page 7 coded by Lab.

4 For sRGB some colors are out of gamut. These are marked by a dot and the RGB values are clipped. Load in Photoshop any page in its specific Color space and measu-re RGB and Lab values. The values are colorimetrically correct but a little rounded. Page 8 is used similarly. Gray accuracy: page 9 shows a cielab grayscale chart, coded by sRGB. This will be printed mostly by K-only because of an internal interpretation of R=G=B. Page 10 shows a similar cielab grayscale chart. B is a little modified. This page should be be printed always by CMYK rich black, nearly as neutral gray. Page 11 is defined as PostScript graphic with values K=0 to 100. Grayscale conversions: chapter shows several conversions.

5 Images 1 to 6 are grayscales, coded by 1 byte per pixel. According to chapter dot gain can be replaced by an equivalent gamma. Images 7 and 8 are in CMYK with three empty channels CMY, coded by 4 bytes per improved workflow is explained in chapter . Introduction . IntroductionHow to apply the test Pages using a RIP (Raster Image Processor)RGB source space sRGBCMYK source space NoneDestination space Actual Printer profileRendering Intent Relative ColorimetricThis should show all components correctly printed. CMYK is passed through without any change. K-only should be printed by pure to apply the test Pages using PhotoshopResumedPrinting by a RIP retains all features of the test Pages .

6 Printing by Photoshop should be done in RGB mode. The result is easily affected by wrong settings. Open document in CMYK working spaceCMYK values are correctly indicated. RGB values are converted to CMYK using the actual Color spaces. This mode can be used for printing but the RGB components cannot be reproduced correctly. Open document in RGB working space RGB values and Lab values are correctly indicated. CMYK values are converted to RGB using the actual Color spaces. K-only components appear as rich black (the CMY channels are not empty).This mode can be used for printing but the CMYK components cannot be repro-duced Color space sRGBCMYK space Euroscale Coated Grayscale Gamma= space Actual Printer profileRendering Intent Relative ColorimetricThe settings for Acrobat (Reader) Color spaces sRGB / Euroscale Coated / Gray Gamma= (see )Soft proof OffThis document does not have embedded document does have a global output intent: should be used by numbers.

7 Next text 75% black: Graywedge 1 should be printed by rich black CMYK. Graywedge 2 by K-only. Graywedge 1 has always a tint until the Printer is accurately Color calibrated. The three CMY wedges should be printed by pure text 100% black: Source working space for RGB components was sRGB. Artefacts may appear in the PDF pre-view if Smooth Line Art is enabled in Ink Limit 300% 70/70/60/100sRGB BMP-24 sRGB 2 sRGB BMP-24C M YRGBK-onlyGrayscale DotGain cielab -Values by / R011220 / June 17 2007 PostScript coded by sRGB / D65 / Out of gamut marked by dot12345678910 11 12 13 14 15 16 17 18 19 20 21 2212345678910 11 12 13 14 15 16 17 18 19 20 21 22 ABCDEFGHIJKLABCDEFGHIJKL cielab -Values by / R011220 / June 17 2007 PostScript coded by sRGB / D65 / Out of gamut marked by 11 12 13 14 15 16 17 18 19 20 21 2212345678910 11 12 13 14 15 16 17 18 19 20 21 22

8 ABCDEFGHIJKLABCDEFGHIJKLC oded by sRGB numbers / Background cielab -Values by / R011220 / June 17 2007 PostScript coded by ProPhotoRGB / D5012345678910 11 12 13 14 15 16 17 18 19 20 21 2212345678910 11 12 13 14 15 16 17 18 19 20 21 22 ABCDEFGHIJKLABCDEFGHIJKL cielab -Values by / R011220 / June 17 2007 PostScript coded by ProPhotoRGB / 11 12 13 14 15 16 17 18 19 20 21 2212345678910 11 12 13 14 15 16 17 18 19 20 21 22 ABCDEFGHIJKLABCDEFGHIJKLC oded by ProPhotoRGB numbers / Background cielab -Values by / R011220 / June 15 2007 PostScript / cielab coded / Reference white D50 12345678910 11 12 13 14 15 16 17 18 19 20 21 2212345678910 11 12 13 14 15 16 17 18 19 20 21 22 ABCDEFGHIJKLABCDEFGHIJKL cielab -Values by / R011220 / June 15 2007 PostScript / cielab coded / Reference white D50

9 11 12 13 14 15 16 17 18 19 20 21 2212345678910 11 12 13 14 15 16 17 18 19 20 21 22 ABCDEFGHIJKLABCDEFGHIJKLC oded by Lab numbers / Background L=50 4501522550149255014625501432550140255013 6255013225501272550122255011625501092555 1100255949125512279255145632551654025518 4025535015125501482550145255014225501392 5501352550131255012625501202550114255451 0725589992551178925514077255160602551783 5255195025525015025501472550144255014125 5013825501342550130255012525501192553411 3255831062551119725513487255154752551725 8255188292552040255901492390146239014423 9014023901372390133240012924001242401611 8240751122401051042401279624114785241165 7324118155241197232422120242001482210146 2210143221014022201362220132222012822201 2322266117222971112231201032231409422315 8842231747122319052224205172242190224030 1472030145204014220401392040135204013120 4012720454122205881162051121102051321022 0515093205167832061826920619750206211820 7225020796014718601441860141186013818601 3518701311873612618777121187103115187124 1091881421011881589218817481188189671892 0348189216019023001909801461690144169014 1169013816901341690130169641261709312017 0114115170133108170150100171165911711808 0171194661722084617222101732340173801461 5101431510140152013715201341524713015280 1251531041201531231141531401071531561001 5417190154185791551996515521244155225015 6237015684014513401431340140134013713515 1331356512913592125136112119136130113136 1461071371619913717690137189781382036413 8215421392280139241014076014511701431170 1401170136117451331187712911810012411911 9119119136113119151106120166981201808912 1193781212066312221841122231012324301247 0145990142100013910001361005913210186128 1011061241011241191021401131021551061031 6998104183891041967710520862105221391062 3301072450108701458101428201398231136836 9132839212884111123841281188514411285158 1058617298871858887198778821161892233890 2350912470927014462014263013963441366475 1326597128651151236613211867147112681611 0569174976918788702007671212617322537742 3707524807670144400142410139425313543801 3244101128451181234613411847149112491631 0550176975118987532017654214605522636572 3805824906060144301426213995813512831321 5103128171201232013611822150112251641052 7177973019087322027534215603722736392390 4125004360144001410181380621350861320105 1270122123013711801511120165105017897019 1870203754215601022735162390202510256014 4001410251380641350871310106127012312301 3811701521110166105017997019187020475021 6600228350240002510060144001410291380661 3508913101071270124123013911701531110166 1050179960192870204750216590228350240002 5200601440014103213806713509013101081270 1241230139117015311101671040180960192870 2057502175902293502400025200-100 -90 -80 -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