061201 http://www.ps.bam.de/19797TE/index.html

Examples of BAM-test charts for colour measurement of output linearization according to ISO/IEC TR 19797:2004-09
"
Device output of 16-step colour scales, output linearization method (LM) and specification of the reproduction properties"

Fot his page in German, see 19797T

Output linearization requires at least 128 colour measurements for printer or monitor systems. The device system of a printer or monitor includes all software and hardware as a "black box" between the input of the digital ISO/IEC-test chart and the output of the analog ISO/IEC-test chart, e. g. on a printer as hardcopy or on a monitor as softcopy .

Any ISO/IEC-test chart of the following tables in the format PostScript (NP.PS file) or Portable Document (NP.PDF file) includes no colour managment software and no profiles. (The PDF files on the web server are produced with the software Adobe Acrobat Distiller 3.0). The user may directly download a NP.PS file in PostScript to the PostScript printer. For the test the user usually transfers the NP.PS file in a NP.PDF file with his software version of Adobe Acrobat DIstiller and outputs this file with his Acrobat Reader on the monitor or printer.

The MTL code (= Measurment, Transfer und Linearization) is used for the output linearisation of ISO/IEC-test charts on printers and monitors.

The NP file without MTL code (N=No) in the file and in the format PDF (=P) is used for the start output.
The FP file with the MTL code in the file (F) and in the format PDF (=P) is used for the linearized output.

For Output Linearization the files of the following folders must be used:
The CIELAB data of the NP file output which are in the folders DE95, EE95 and FE95 must be measured for printers (and for monitors only if the reflection of the ambient light on the monitor surface can be measured).

Usually only direct measurment on the image screen is possible without the ambient light reflections. For monitors in this case the CIEXYZ data of the NP file output must be measured which are in the folders IE95, JE95 and KE95. In this case the luminance reflectance of the ambient light is assumed to be Yr =0.0, 2.5, 5.0 or 7.5 which corresponds to the CIE lightness L*n = 0, 18, 27 or 33 of black N . The NP files and FP files for monitor output exist in the four folders IE95A, IE95B, IE95C, IE95D for the four different luminance reflectance of the ambient light.

If the measurement data of the NP file (start output) are included in the corresponding FP file with any editor (the appropriate normalisation of the CIEXYZ data is done bz the FP file) then the FP file output on printers and monitors show the 16ßstep output which is approximately equally spaced in CIELAB for the seven output series between White W and the six chromatic colours CMYOLV and Black N.

If the output device system produces different outputs for the two ISO/IEC-test charts with the device coordinates cmyn* and olv* then 256 colours must be measured.

BAM
test chart
colour space
PostScript
operator
used in file
Folder for
download of
NP-files and FP-files
Download example for NP-file in PS / PDF
(size / kByte)
Download example for FP-file in PS / PDF
(size / kByte)
Measurement for printer or monitor systems, Remark
CMY0* and
000N*
cmy0* or 000n* setcmykcolor DE95 140 / 210 240 / 310 CIELAB
example for
ISO/IEC TR 19797
OLV* and
GRAY*
olv* setrgbcolor or w* setgray EE95 140 / 210 240 / 310 CIELAB
LAB*
(CIELAB)
LAB* setcolor FE95 140 / 210 240 / 310 CIELAB
CMY0* and
000N*
cmy0* or 000n* setcmykcolor IE95A 140 / 210 240 / 310 CIEXYZ, L*n=0
CMY0* and
000N*
cmy0* or 000n* setcmykcolor IE95B 140 / 210 240 / 310 CIEXYZ, L*n=18
example for
ISO/IEC TR 19797
CMY0* and
000N*
cmy0* or 000n* setcmykcolor IE95C 140 / 210 240 / 310 CIEXYZ, L*n=27
CMY0* and
000N*
cmy0* or 000n* setcmykcolor IE95D 140 / 210 240 / 310 CIEXYZ, L*n=33
OLV* and
GRAY*
olv* setrgbcolor or w* setgray JE95A 140 / 210 240 / 310 CIEXYZ, L*n=0
OLV* and
GRAY*
olv* setrgbcolor or w* setgray JE95B 140 / 210 240 / 310 CIEXYZ, L*n=18
OLV* and
GRAY*
olv* setrgbcolor or w* setgray JE95C 140 / 210 240 / 310 CIEXYZ, L*n=27
OLV* and
GRAY*
olv* setrgbcolor or w* setgray JE95D 140 / 210 240 / 310 CIEXYZ, L*n=33
LAB*
(CIELAB)
LAB* setcolor KE95A 140 / 210 240 / 310 CIEXYZ, L*n=0
LAB*
(CIELAB)
LAB* setcolor KE95B 140 / 210 240 / 310 CIEXYZ, L*n=18
LAB*
(CIELAB)
LAB* setcolor KE95C 140 / 210 240 / 310 CIEXYZ, L*n=27
LAB*
(CIELAB)
LAB* setcolor KE95D 140 / 210 240 / 310 CIEXYZ, L*n=33

For the last public version of ISO/IEC TR 19797:2004-09 see 19797E

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