181212 and 030101: A/DE14/DE14L.HTM
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Output linearization of 16 step
colour series by CIELAB colour measurement of the start output
No Linearization Method (N) and CM Method using data in the File
(F), or in the Distiller Startup (S) directory, or in the PS Device
(D)
For similar Methods and files to produce a start and linearized output of a single Figure or many Figures of the ISO/IEC-test charts or the complete ISO/IEC-test charts, see DE00
1.0 Different model files for Linearization Method (CM) of 16step colour series
The file extentions are defined by 4
or 5 characters, e g. NP.PS and NP.PDF:
One character describes the output by N=No or F=File
Three or four characters describe the file format:
This leads for No (N) Linearization
Method to the file extentions:
(NA.PS->NA.TXT) (NB.PS->NB.BMP) (NG.PS->NG.GIF) (NH.PS->NH.HTM_GIF)
(NI.PS->NI.HTM_JPE) (NJ.PS->NJ.JPE) (NP.PS->NP.PDF) (NT.PS->NT.TIF)
This leads for File (F) Linearization
Method to the file extentions:
(FA.PS->FA.TXT) (FB.PS->FB.BMP) (FG.PS->FG.GIF) (FH.PS->FH.HTM_GIF)
(FI.PS->FI.HTM_JPE) (FJ.PS->FJ.JPE) (FP.PS->FP.PDF) (FT.PS->FT.TIF)
2. 0 Examples
PS output files NA.PS and FA.PS useful for a PS device only:
The file NA.PS (No Linearization Method) includes no output measurement
data of the start output step S1. The file NA.PS will produce
the standard output in series "N:".
The file FA.PS (F=File Linearization Method) includes the output
measurement data (CIELAB data) of the file NA.PS. The file FA.PS
will produce the linearized output for the 16step grey and colour
scales in the series "F:".
There are three steps S1 (Start output), S2 (Linearized output),
and S3 (Result output) recommended here:
Step S1: Start output of the 16step colour series W CMYN
and W - OLV(CMY) between the colour white W (paper
white) and the four colours CMYN or the four colours OLV(CMY).
Remark: The output measurement data are used to produce the linearized
output. For linearization the CIELAB data of all 16step colour
series W CMYN and W OLV(CMY) (8 x 16 x 3 data) of
step S1 are necessary and must be included in the file
of step S2.
Step S2: Linearized output of the all 16step colour series which are approximately equidistant in CIELAB colour space.
Step S3: Result output with the specification of the reproduction properties of the start output and the linearized output according to the method given in Annex G of DIN 33866-1:2000-08 and ISO/IEC 15775:1999-12.
Short description of the method using
the PS output method for the device T:
1. The file A/DE14/10T/T10E00NA.PS
is used to produce the start PS ouput on a PS printer.
2. The four 16step colour series of the output NA are measured
in the sequence F to 0 (from the colour to the white).
3. The four 16step CIELAB colour data of the output NA
are included in the file FA.
4. The file A/DE14/10T/T10E00FA.PS
is used to produce the linearized
PS ouput on a PS printer.
5. The four 16step colour series of the output FA are measured
in the sequence F to 0 (from the colour to the white).
6. The four 16step CIELAB colour data of the output NA
(step S1) and FA (step S2) are included in
the file RA (R=result).
Remark: For a start and linearized PDF output on any
printer (instead of the PS output on a PS printer) the software
Adobe Acrobat Distiller or an equivalent is necessary.
The software is used to produce PDF files from the PS files.
1. Output linearization of the figures B4 and D4 of the chromatic ISO/IEC-test charts no. 2 and no. 4
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 steps of the 16step colour series or all the Landolt -rings, then there is the intention for an linearized printer output.
The following Table 1 shows examples for the specification of the reproduction properties of the start output and the linearized output according to the method given in Annex G of DIN 33866-1:2000-08 and ISO/IEC 15775:1999-12.
Table 1 shows some important test results for the start output and the linearized output for PDF output files:
| Specification according to ISO/IEC 15775 by the mean of 16 CIELAB colour differences of the actual output compared to the reference output defined by the printer colours CMYN or OLV(CMY) and W | Device
F Photo colour printer; Output files: F10E00NP.PDF and F10E00FP.PDF Only PS output files possible! |
Device
O Laser colour printer; Output files: O10E00NP.PDF and O10E00FP.PDF Result (R) in table and graphic form (8 pages): O10E00RP.PDF |
Device
T Laser colour printer; Output files: T10E00NP.PDF and T10E00FP.PDF Result (R) in table and graphic form (8 pages): T10E00RP.PDF |
| Mean of 16 Cyanblue (C - W) colour differences | - no PDF file possible | 12.8 for the
start output 2.6 for the linearized output |
11.9 for the
start output 1.7 for the linearized output |
| Mean of 16 Magentared (M - W) colour differences | - no PDF file possible | 7.0 for the
start output 1.6 for the linearized output |
14.8 for the
start output 1.8 for the linearized output |
| Mean of 16 Yellow (Y - W) colour differences | - no PDF file possible | 6.9 for the
start output 2.0 for the linearized output |
13.9 for the
start output 2.8 for the linearized output |
| Mean of 16 Black (N - W) colour differences | - no PDF file possible | 2.2 for the
start output 1.2 for the linearized output |
5.5 for the
start output 2.1 for the linearized output |
| Mean of 16 Orangred (O - W) colour differences | - no PDF file possible | 7.8 for the start output 1.1 for the linearized output |
15.3 for the start output 1.6 for the linearized output |
| Mean of 16 Leafgreen (L - W) colour differences | - no PDF file possible | 7.0 for the start output 1.4 for the linearized output |
13.8 for the start output 1.8 for the linearized output |
| Mean of 16 Violettblue (V - W) colour differences | - no PDF file possible | 10.4 for the start output 1.2 for the linearized output |
8.9 for the start output 0.9 for the linearized output |
| Mean of 16 Black (CMY - W) colour differences | - no PDF file possible | 12.2 for the start output 0.8 for the linearized output |
3.8 for the start output 1.6 for the linearized output |
In Table 1 three different printers using the PostScript operator: cmyn* setcmykcolor (series A/DE14/10X/X10E00FP.PDF, X=F,O,T) are shown. The files with the extention NP.PDF (N=no Linearization Method) and FP.PDF (F=File Linearization Method) distinguish only by a few lines of PS code at the beginning. This code includes the CIELAB data of the start output S1 produced by the file NP.PDF and the Linearization Method code which linearizes the colour output in step S2.
Table 2 shows some important test results for the start output and the linearized output for PS output files:
| Specification according to ISO/IEC 15775 by the mean of 16 CIELAB colour differences of the actual output compared to the reference output defined by the printer colours CMYN or OLV(CMY) and W | Device
F Foto colour printer; Output files: F10E00NA.PS and F10E00FA.PS Result (R) in table and graphic form (8 pages): F10E00RA.PDF |
Device
O Laser colour printer; Output files: O10E00NA.PS and O10E00FA.PS Result (R) in table and graphic form (8 pages): O10E00RA.PDF |
Device
T Laser colour printer; Output files: T10E00NA.PS and T10E00FA.PS Result (R) in table and graphic form (8 pages): T10E00RA.PDF |
| Mean of 16 Cyanblue (C - W) colour differences | 8.3 for the
start output 0.4 for the linearized output |
4.9 for the
start output 1.3 for the linearized output |
5.9 for the
start output 1.4 for the optimzed output |
| Mean of 16 Magentared (M - W) colour differences | 12.4 for the
start output 0.9 for the linearized output |
11.1 for the
start output 2.3 for the linearized output |
7.2 for the
start output 2.2 for the optimzed output |
| Mean of 16 Yellow (Y - W) colour differences | 2.7 for the
start output 1.8 for the linearized output |
17.1 for the
start output 2.1 for the linearized output |
6.2 for the
start output 2.9 for the optimzed output |
| Mean of 16 Black (N - W) colour differences | 1.9 for the
start output 0.3 for the linearized output |
6.1 for the
start output 0.8 for the linearized output |
2.7 for the
start output 0.9 for the optimzed output |
| Mean of 16 Orangred (O - W) colour differences | 3.5 for the start output 1.1 for the linearized output |
10.3 for the start output 3.3 for the linearized output |
8.9 for the start output 2.3 for the linearized output |
| Mean of 16 Leafgreen (L - W) colour differences | 5.0 for the start output 1.2 for the linearized output |
12.6 for the start output 1.9 for the linearized output |
6.2 for the start output 2.8 for the linearized output |
| Mean of 16 Violettblue (V - W) colour differences | 9.2 for the start output 0.6 for the linearized output |
5.0 for the start output 2.4 for the linearized output |
4.5 for the start output 1.7 for the linearized output |
| Mean of 16 Black (CMY - W) colour differences | 1.4 for the start output 0.3 for the linearized output |
6.3 for the start output 0.7 for the linearized output |
3.0 for the start output 0.4 for the linearized output |
Table 2: Specification of reproduction properties of the W CMYN and W OLV(CMY) output on three different printers using the PS operator cmyn* setcmykcolor (* = relative coordinates in CIELAB color space) and the PS output file.
Remark: An important exercise in four steps which is recommended for visual linearization of the output and which may be used for any printer, monitor or a video-beamer is given four a black and white printer by the URL DE09.
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