030215: www.ps.bam.de/IE13/IE13.HTM

Digital ISO/IEC-test charts according to ISO/IEC 15775: 1999-12
and DIS ISO/IEC 19839-1 to -4: 2000-04
"Specifying image reproduction of colour devices with digital and analog test charts"
No. 1:
achromatic with large lightness contrast of photography
No. 2: chromatic with CMY-colours and flower motif
No. 3: achromatic with medium lightness contrast of offset printing
No. 4: chromatic with OLV-(RGB-)colours and test colour motif

Digital ISO/IEC-test chart: Remarks and image reproduction  PostScript-Format
Filetype TXT or EPS
Portable Document Format PDF (Reader 4.0, 3.0 and 2.1)
No. 1: achromatic with large lightness contrast of photography  text mode (T) (achromatic colour is produced only by colour black N) 

E1-1TS22.( TXT / EPS )
108 kByte

E1-1TD22.PDF
113 kByte
colour mode (C) (achromatic colour is produced by black N and e. g. CMY )

E1-1CS22.( TXT / EPS )
108 kByte 

E1-1CD22.PDF
110 kByte
No. 2: chromatic with CMY-colours and flower motif colour mode (C)
192 x 128 pixel in image

E1-2CS22.( TXT / EPS )
250 kByte 

E1-2CD22.PDF
238 kByte
colour mode (C)
384 x 256 pixel in image 

E2-2CS22.( TXT / EPS )
700 kByte

E2-2CD22.PDF
264 kByte
colour mode (C)
768 x 512 pixel in image 

E3-2CS22.( TXT / EPS )
2500 kByte

E3-2CD22.PDF
261 kByte
No. 3: achromatic with medium lightness contrast of offset printing text mode (T) (achromatic colour is produced only by colour black N)

E1-3TS22.( TXT / EPS )
108 kByte 

E1-3TD22.PDF
113 kByte 
colour mode (C) (achromatic colour is produced by colour black N and e. g. CMY)

E1-3CS22.( TXT / EPS )
108 kByte

E1-3CD22.PDF
110 kByte  
No. 4: chromatic with OLV-(RGB-) colours and test colour motif colour mode (C)
192 x 128 pixel in image 

E1-4CS22.( TXT / EPS )
250 kByte

E1-4CD22.PDF
238 kByte 
 colour mode (C)
384 x 256 pixel in image

E2-4CS22.( TXT / EPS )
700 kByte

E2-4CD22.PDF
264 kByte 
colour mode (C)
768 x 512 pixel in image

E3-4CS22.( TXT / EPS )
2500 kByte

E3-4CD22.PDF
261 kByte 

Table 1: Two identical PostScript-files with the file extensions ".TXT" and ".EPS" can be downloaded. The TXT-file presents directly within any Web-browser the PostScript-program code.

With EPS-files the best reproduction in colour and resolution is reached. One can use on the Windows-platform "copy" and on the Macintosh-platform "download" to print the EPS-file by a PostScript-printer.The EPS-file can be viewed directly on a colour monitor by a display-Postscript system (e. g. Nextstep, Openstep on Windows, Yap on Macintosh OS X server).

One can use the PDF-file to view the digital ISO/IEC-test charts on any monitor and to print on any colour or black and white printer (not only PS-printers) by Adobe Acrobat Reader (or Exchange) Version 4.0, 3.0 or 2.1.

Output optimization of the achromatic ISO/IEC-test chart no. 3

If the start printer output of the ISO/IEC-test chart fails to pass some of the ISO/IEC-tests according to ISO/IEC 15775, e. g. to recognize the 16 grey steps or all the Landolt -rings, then there is the intention for an optimized printer output. The following Table 2 shows examples for the specification of the reproduction properties of the start output and the optimized output according to the method given in Annex G of DIN 33866-1:2000-08 and ISO/IEC 15775:1999-12.

Specification according to Annex G of DIN 33866-1 or ISO/IEC 15775 Device A
Black and white printer;
Output files A9120ENP.PDF and A9120EFP.PDF
Device F
Foto colour printer;
Output files F9120ENP.PDF and F9120EFP.PDF
Device O
Laser colour printer;
Output files O9120ENP.PDF and O9120EFP.PDF
Device T
Laser colour printer;
Output files T9120ENP.PDF and T9120EFP.PDF
Mean lightness difference (16 colours), Start output NP.PDF and optimized output FP.PDF 1.9 for start output
0.7 for optimized output
2.5 for start output
0.4 for optimized output
4.8 for start output
0.7 for optimized output
5.4 for start output
0.8 for optimized output
Regularity (5 colours), Start output NP.PDF and optimized output FP.PDF 77.1 for start output
90.2 for optimized output
67.0 for start output
92.0 for optimized output
33.7 for start output
94.1 for optimized output
49.3 for start output
89.9 for optimized output

Table 2: Specification of the reproduction properties of the black and white start and optimized output.

In Table 2 four different printers using the PostScript operator: 0 0 0 n* setcmykcolor (series www.ps.bam.de/DE09/9120n/n9120EFP.PDF, n=A,F,O,T) are shown. The files with the extention NP.PDF (N=no colour management) and FP.PDF (F=File colour management) distinguish only by a few lines at the beginning, which includes the colour management data (which optimizes the colour output). The file FP.PDF includes the measured the CIE lightness data L* of the start output by the file NP.PDF.

Important exercise in four steps which is recommended for a user who likes to optimize visually the output of his device which may be a printer, monitor or a Video-beamer:
1. The PS file
T9120EFP.PS is copied to T9120ECP.PS (instead of F=File the abreviation C=Changed is used)

2. The PS file T9120ECP.PS includes in line 81 and 82 the measured lightness data L* of the 16 grey steps of the output of the file
T9120ENP.PS.
The 16 measurement data are as follows:
12.80 13.24 13.63 19.19 26.83 34.12 40.27 44.95
50.75 55.23 60.02 70.35 76.19 83.60 88.87 96.39
It is recommended to change the 16 data to the 16 default relative values in equidistant steps with a step difference of 6.67:
00.00 06.67 13.33 20.00 26.67 33.33 40.00 46.67
53.33 60.00 66.67 73.33 80.00 86.67 93.33 100.0
This gives the final PS file T9120ECP.PS (we have changed additionally the name FP.PS to CP.PS in the file)

3. Produce an output of the three PS files NP.PS, FP.PS and CP.PS on a PS printer or Display PostScript system (or use e. g. Adobe Acrobat Distiller and produce und use PDF files for output)

4. The output comparison of the three PS files (or three PDF-files) shows that visually the 16 grey steps and Landolt-rings in T9120ENP.PS and T9120ECP.PS are identical.
The file
T9120EFP.PS gives a lighter output (the start output was too dark). The output comparison of the three PDF files T9120ENP.PDF, T9120ECP.PDF and T9120EFP.PDF shows the same properties.

Result: Only the change of two lines with the relative CIELAB lightness data L* from equidistant relative values to measuered values allow to optimize the output of the achromatic ISO/IEC-test chart.

Recommended application for a user device (e. g. a printer, a monitor or a Video-beamer):
1. If the output seems too light for light colours then guess and change mainly the lighter values, e. g. guess and use 90 and 72 instead of the default values 80 and 60.
00.00 06.67 13.33 20.00 26.67 33.33 40.00 50.66
61.33 72.00 78.00 84.00 90.00 93.33 96.66 100.0
This is realized in the files T9120ECPN.PS and T9120ECPN.PDF which produce a darker (N) output for light colours only. The dark colours remain unchanged.

2.If the output seems too dark for dark colours then guess and change mainly the darker values, e. g. guess and use 10 and 28 instead of the default values 20 and 40.
00.00 03.33 06.67 10.00 16.00 22.00 28.00 38.66
49.33 60.00 66.67 73.33 80.00 86.67 93.33 100.0
This is realized in the files T9120ECPW.PS and T9120ECPW.PDF which produce a lighter (W) output for dark colours only. The light colours remain unchanged.

An optimized output often depends on more acurate input data. They are produced by colour measurement of the grey steps in the start output or by visual comparison with the grey steps of a reference, e. g. the DIN-test chart no. 1 according to DIN 33866-1 or the ISO/IEC-test chart no. 1 according to ISO/IEC 15775.

Remark 1: Output optimization for images with 32 ISO/IEC-test colours is under development (result expected in April 2001)
Remark 2: Output optimization for chromatic ISO/IEC-test charts no. 2 and no. 4 is under development (result expected in May 2001)
Remark 3: The 16 above lightness data may be stored in the Distiller Startup (S) directory. A PS file can be produced by nearly any application. If a user produces from this PS file a PDF file then the Distiller may take the lightness data from the Distiller Startup (S) directory to produce the intended correction.
Remark 4: If the 16 above lightness data are stored in the PostScript Device (D) memory, then the output of all PS files of any application may produce the intended correction.

Further discussion, examples and ideas for different printers with english text, see: DE09

The ISO/IEC-test charts with german text: IG13
The DIN-test charts with german text: DG13
The DIN-test charts with english text: DE13

DE801: 030215: Figures and ISO/IEC-test charts for different input and different output PS operators

Digital Asian ISO/IEC-test charts with english text: http://www.jbmia.or.jp/~isoiec/sc28/testchart/index.htm

change to DE (information about DIN 33866-1 to 5: 2000-07 in english)
change to DG (information about DIN 33866-1 to 5: 2000-07 in german)
change to IE (information about ISO/IEC 15775: 1999-12 and DIS ISO/IEC 19839-1 to 4: 2000-04 in german)
change to IG (information about ISO/IEC 15575: 1999-12 ans DIS ISO/IEC 19839-1 to 4: 2000-04 in english)

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