181212 and 030101: A/DE36/DE36.HTM
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32 ISO/IEC-test colours defined by raw scan data or by raw scan data which are changed by different local input transfer functions. Each image of the 16 on one page include three series:
1. local raw scan image data
2. local raw scan image data transfered by a PS code program and
by the Input Linearization (IL) method
3. local raw scan image data transfered by a separate FORTRAN
program to the new hexadecimal image data and by the Input
Linearization (IL) method
and one global Output Linearization (OL) method. The model method uses here a square root (sqrt) function.
1. global sqrt model tranfer with setcolortransfer
Test intention for the Input Linearization
(IL) method:
A raw scan image file including olv* orcmyn* color
data of 8bit image data in relative coordinates olv* (rgb*) and cmyn* is changed.
One of three identical parts of the raw scan image data is changed by a separate FORTRAN program to new hexadecimal image data by the Input Linearization (IL) method. This lead to the standard image data in this part.
Test intention for the Output Linearization
(OL) method:
The image file (one of the three parts includes standard image
data) is changed by a setcolortransfer function to
produce the same output by different output Linearization
(OL) methods using the Output Linearization data in the PS-file
(F), the Distiller Startup (S) directory, or in the PS-device
(D) memory, e. g. a PS-printer.
Method:
A Output Linearization file OUTLINXY.PS (X=N,F,S,D,T,E;
Y=A,P) is used to store the following data:
The standard PS-operators
setgray, setrgbcolor, setcmykcolor , settransfer and setcolortransfer
are modified and include then a square root transfer function
for olv* and a square function for cmyn* changing all colours
to lighter colours for the whole output page.
In a first step four global (g)
PS-operators are defined to be identical to the standard PS-operators
/sggray
{setgray} bind def
/sgrgbcolor {setrgbcolor} bind def
/sgcmykcolor {setcmykcolor} bind def
/sgtransfer {settransfer} bind def
/sgcolortransfer {setcolortransfer} bind def
Then the former standard PS-operators are redefined by the four global (g) PS-operators which are modified by the PS-square root function {sqrt = 0.5 exp} here in this example.
%p=positive or n=negative change with
lightness for olv* (rgb*) and cmyn*
/prozp {0.5 exp} bind def /transp {prozp} bind def
/prozn {2.0 exp} bind def /transn {prozn} bind def
/setgray {transp sggray} def
/setcmykcolor
{/ncolor exch transn def /ycolor exch transn def
/mcolor exch transn def /ccolor exch transn def ccolor mcolor
ycolor ncolor sgcmykcolor} def
/setrgbcolor {/bcolor exch transp def /gcolor exch transp
def
/rcolor exch transp def rcolor gcolor bcolor sgrgbcolor}
def
/settransfer {/ntransfer exch def {ntransfer transp} sgtransfer}
def
/setcolortransfer {/ntransfer exch def /ytransfer exch
def /mtransfer exch def /ctransfer exch def {ctransfer transp}
{mtransfer transp}{ytransfer transp} {ntransfer transp} sgcolortransfer}
def
The effect is very important for the Output Linearization (OL): All colour data of the 8bit image and colour patches on the whole page are modified by the PS-square root function and become lighter.
Files for Output Linearization (OL) method: There are three methods (no. 2 to 4) to make the modifications. The most effective way (no. 4) is to store the file OUTLINXY.PS in a PS-device, e. g. a PS-printer. Then the PS-interpreter in the PS-printer will change all colours according to the redefined PS-functions: setgray, setcmykcolor, setrgbcolor, settransfer, and setcolortransfer.
If the transfer functions defined
in OUTLINXY.PS for Output Linearization of any device are
based on CIELAB Colour Measurement of a start output on
this devices then any standard PS-image file will produce the
same visual output on any device. This is not realized in
the examples here which only give the theoretical basis for this
intention.
Thefore the following examples will show that it seems possible
that any 8bit image file (based on an standard P.PS-file)
will produce the same visual output on any device (not
only on PS-devices).
This is an important solution for the Output Linearization (OL) method as many PS-image files (A.PS- and P.PS-files) are based on only a few PS-operators which are modified according to the Output Linearization (OL) method by the file OUTLINXY.PS for the device output.
3.0 Input and Output Linearization (IL and OL) with 32 ISO/IEC-test colours for the device T
Remark 1: The files for the different OL methods N, F, S, D are in the chapters X.1, X.2, X.3, X.4 (X=3 for the devices T)
3.1 N=No Output Linearization (OL), Device T, Start output of step S1, file formats PS and PDF only
| Digital colour test charts for colour printers and black and white printers | Remarks for use and reproduction | Both PostScript format File extent. NA.PS and NA.TXT |
PostScript and Portable Document Format (Version
3.0) File extent. NP.PS and NP.PDF |
| Files: T10E00N.. 32 ISO/IEC-test colours |
N=No Linearization Method |
119 kByte |
119 / 39 kByte |
3.2 F=File Output Linearization (OLF),
Device T, linearized output of step S2, file formats PS and PDF
only
| Digital colour test charts for colour printers and black and white printers | Remarks for use and reproduction | Both PostScript format File extent. FA.PS and FA.TXT |
PostScript and Portable Document Format (Version
3.0) File extent. FP.PS and FP.PDF |
| Files: T10E00F.. 32 ISO/IEC-test colours |
F=File Linearization Method |
119 kByte |
119 / 39 kByte |
3.3 S=Startup Output Linearization
(OLS) by Adobe Acrobat Distiller
3.0 using the file T10E00SA.PS and
the file OUTLINSA.PS in the Distiller
Startup directory (S). This output can be simulated by the
file T10E00TP.PS which includes
in the file the same Startup (S) file OUTLINTP.PS.
The file T10E00SP.PS includes no
output linearization file and will therefore show the result with
no output linearization.
Remark 1: The Distiller 3.0_S (S=Startup) directory has been used
to produce the file with the extention TP.PDF frorm TP.PS.
This simulates the output.
| Digital colour test charts for colour printers and black and white printers | Remarks for use and reproduction | Both PostScript format File extent. SA.PS and SA.TXT File for output linearization in the Startup (S) directory: OUTLINSA.PS |
PostScript and Portable Document Format (Version
3.0) File extent. SP.PS and SP.PDF Simulation: TP.PS and TP.PDF T: Simulation of output linearization including the file: OUTLINTP.PS |
| Files: T10E00S.. 32 ISO/IEC-test colours |
S=Startup Linearization Method |
119 kByte |
Simulation: T10E00TP(.PS / PDF ) 119 / 39 kByt.e |
Remark 1: The Distiller 3.0_S (S=Startup) directory has been used to produce the file with the extention EP.PDF frorm EP.PS. This simulates the output only approximately. We found larger differences between PS output and PDF output which varies by the every Distiller version.
| Digital colour test charts for colour printers and black and white printers | Remarks for use and reproduction | Both PostScript format File extent. DA.PS and DA.TXT File for output linearization in the PS Device (D): OUTLINDA.PS |
PostScript and Portable Document Format (Version
3.0) File extent. DP.PS and DP.PDF Simulation: EP.PS and EP.PDF E: Simulation of output linearization including the file: OUTLINEP.PS |
| Files: T10E00D.. 32 ISO/IEC-test colours |
D=Device Linearization Method |
119 kByte |
Simulation: T10E00EP(.PS / PDF ) 119 / 39 kByt.e |
Remarks to the files:
There are three identical PostScript-files
with the file extensions "A.TXT", "A.PS" and
"P.PS" and one PDF-file "P.PDF".
The file with the extention "A.TXT" is used to show directly the PostScript-program code in the browser window.
The file with the extention "A.PS" is used for download to the local drive and is used for output on a PostScript printer or a Display PostScript System.
Very important remarks: The file with the name OUTLINXY.PS (X=N,F,S,D,T,E; Y=A,P) includes the Output Linearization (OL) data. This file is only a part of a PostScript program. There are three possibilities to locate (store) this program:
1. The file OUTLINXY.PS is included in the file L8640EFA.PS to produce a download to a PS-device, e. g. a printer. Or the file L8640EFP.PS and the standard Distiller are used to distill the P.PS-file.
2. The file OUTLINXY.PS is added to a Startup (S) directory (there
is one file Example.ps allready). It is recommended here to use
the standard Distiller in a special directory (_S=Startup)
to distill the P.PS-file L8640ESP.PS (For more information
look at the following).
3. The file OUTLINXY.PS is added to the PS-definitions
in a PostScript device (e. g. a printer or DPS-System). The PS
file L8640EDA.PS is downloaded to the PS-device (D). The
information in this file is used for every output (in normal case
for every output until restart of the PS-device).
Five remarks to the important possibility
no. 2 (Output Linearization data in Startup directory):
Remark 1: You may add the file OUTLINXY.PS to the existing
file Example.ps in the Startup (S) directory of the Acrobat 3.0
(or 4.0) directory but this is not recommended here as
every distiller job will then use this information!
Remark 2: It is recommended to duplicate the Adobe Acrobat 3.0 (or 4.0) directory (about 50 Mbyte or install only Acrobat Distiller in this new directory (10 Mbyte)) and rename this directory to Acrobat 3.0_S. This directory then also includes the directory Startup (S) with the only existing file Example.ps. Add the file OUTLINXY.PS. If You start the Distiller stored in the Acrobat_S directory then this information will be used in all Distiller jobs.
Remark 3: You can use the standard directory Acrobat 3.0 (without _S) including the standard Distiller for all jobs to distill as usual.
Remark 4: You must quit the Distiller program if You change the file OUTLINXY.PS in the Startup (S) directory and if You like to use the changed data within the next Distiller job.
Remark 5: You may include the file Example.ps which will avoid to change cmyn*-data to olv* (rgb*)-image data. There is also the possibility to use the preference menue of Adobe Acrobat Distiller for this task.
With PS-files one can reach the best reproduction in colour and resolution. One can use by the operating system Windows "copy" and by the operating system Macintosh "download" to print the PS-file by a PostScript printer.The PS-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).
The file with the extention "P.PS" includes additionally the alphanumeric sequence "P.PS->P.PDF". The P.PS-file may be downloaded to the local drive and transfered to a P.PDF-file by the local software Adobe Acrobat Distiller or equivalent.
The file with the extention "P.PDF" is viewed in the browser window if AdobePDFviewer is installed as browser plugIn. This P.PDF-file may be downloaded to the local drive and viewed with Adobe Acrobat Reader.
The following is very important only if the method is used to optimize the output (by CIELAB colour measurement of the first output which defines the transfer function depending on measurement data).
If the P.PDF-file test is used, then the local P.PS file must be transfered to a P.PDF file by the local computer operating system with the same version of Adobe Acrobat Distiller or an equivalent software.
Remark: The transformation from a P.PS-file to a P.PDF-file may depend on the Distiller version or the version of the equivalent software. Therefore the P.PDF-file from the internet should not be used for the test.
The test result is independend of the Distiller version or the version of the equivalent software. One can use the P.PDF-file to view the digital file 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 2.1, 3.0 or 4.0.
Test procedure for output:
Basic material:
There are 16 files, 4 as Text (A.TXT), 4 as PostScript
(A.PS), 4 as PostScript (P.PS), and 4 as Portable Document
(P.PDF).
Test method:
There is a reference output no. 1 and three lighter outputs no.
2 to no. 4 which are approximately identical. The smal differences
are only based on the reproduction properties of the colour output
and the different interpretation of software and devices of A.PS
and A:PDF files. Some combinations (square output including
square root transfer) must produce the reference output of the
first top left picture.
For PostScript(PS) printers and Display-PostScript(DPS) systems one should use the A.PS files. The transfer of the P.PS files to the P.PDF files allows the output on any printer.
1. PDF-file output on any printer
If the test uses not a PS printer and not a DPS
system then Adobe Acrobat Distiller or an equivalent software
is necessary to transfer the EPS file into the PDF file. The PDF
file is normaly viewed on the monitor and printed by the printer
driver.
2. PS-file output on a PS-printers
If the test uses a PostScript (PS) printer then the software Adobe
Acrobat Distiller or an equivalent is not necessary.
The A.PS-files is used by the PS-interpreter in the printer to
make the output on the PS-printer.
3. PS-file output on a DPS-system (e.
g. Mac OS X Server, Application Yap)
If the test uses a Display PostScript (DPS) system then
the software Adobe Acrobat Distiller or an equivalent is
not necessary. The A.PS-files is used by the PS-interpreter
of the DPS-system to view the file on the monitor and to make
the output by the printer driver of the DPS system on any printer
(PS- and other printers).
4. PDF-file output on a PDF-printer
If the test uses a Portable Document (PDF) printer then
the software Adobe Acrobat Distiller or an equivalent is
necessary to transfer the P.PS-file into a P.PDF-file. The P.PDF-file
is used by the PDF-interpreter in the PDF-printer to make the
output on the PDF-printer.
The following feature is valid only
if the Linearization Method data in the file OUTLINXY.PS are
based on the device, e. g. CIELAB colour measurement of the first
output.
1. There is the same test result independent of the three
above test methods (no. 2 to no. 4) used.
2. The test result is independent of the Adobe Acrobat
Distller Software version and the PostScript version
Remark 1: Examples and methods how to store the file OUTLINXY.PS
in the PS-devices are not realized here.
Remark 2: Examples which include CIELAB colour measurement data
in the file OUTLINXY.PS are not realized here.
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