181212 and 030101: A/DE70/DE70R.HTM

For this page, see DE70 in English or DG70 in German.
For the previous page, see DE69 in English or DG69 in German.
For the next page, see DE71 in English or DG71 in German.
Back to the main page of this colour series, see ../DE in English or ../DG in German.

For a technical paper with discussion and applications of the material, see XY91AE.html

The output depends on the colour workflow (the same or different input and output PS operators), see DE81.HTM

Tables and content of similar data and recommendations about PDF-files, see DE70D.HTM

Procedure for the comparison of the digital output and the reference output

General: The output of the 16 steps of the file L72E05FP.PDF (lower part) must be compared sample by sample with the output of the file L72E01FP. PDF (upper part).
If possible then choose the transparent ISO/IEC-test chart no. 3 as reference (available from BAM with the label L72E01FP.PDF).
If the transparent test chart is NOT available then choose as reference the digital output of the file L72E01FP.PDF(01FP: upper part of the test chart).
The reference output is either the transparent ISO/IEC-test chart or the output of the corresponding IOS/IEC-test chart file.

Remark: The procedure is described here for the test chart files L72*.*. The files L7i*.* (i=0,1,..,9) may be used instead. In all cases the transparent ISO/IEC-test chart no. 3 according to ISO/IEC 15775 (available from BAM) serves as reference.

Step 1: Produce the digital output to be compared with the reference output:
The output of the file L72E05FP.PDF (02FP: lower part of the test chart, only lower part of Fig. C3) on the monitor is produced by the software Adobe Acrobat Reader. Use the option "magnify to 150%" of Adobe Acrobat Reader to produce larger samples of this output compared to the reference.

Step 1a. If the transparent ISO/IEC-test chart no. 3 is available then shift the window with the 16 grey steps at the lower part of the monitor screen and use the large upper white part to mount the transparent ISO/IEC-test chart no. 3. Procede to Step 2a.

Step 1b. If the transparent ISO/IEC-test chart no. 3 is NOT available then shift the 16 grey steps adjacent to the upper part of the Acrobat Reader window by the vertical rulers of the window (magnified to 150%). The vertical size of the Acrobat window may be reduced to about 1/6 of the original vertical window size. Then this window is located at the lower part of the screen and shows only the 16 grey steps. Procede to Step 2b

Step 2: Produce the reference output:
Step 2a: If the transparent ISO/IEC-test chart no. 3 is available then it is required to mount this ISO/IEC-test chart no. 3 on the white monitor screen as reference for comparison. The grey samples are mounted adjacent to the grey samples of the digital output.

Step 2b: If the transparent ISO/IEC-test chart no. 3 is NOT available then for the testing and the training of the method use the output of the file L72E01FP. PDF (01FP: upper part of the test chart) on the monitor screen as reference for comparison. Usually a magnification factor between 100% and 105% of Adobe Acrobat Reader presents the reference A4 size on the monitor. Shift the grey samples of the upper output adjacent to the grey samples of the lower output. Unfortunately the Adobe Acrobat Reader window border (about 5 mm) separates the two grey series but still the comparison is possible.

Remark: If the corresponding PS-files (or PDF-files) are used with the software Adobe Illustrator or Adobe Photoshop the window border may be a thin line and not about 5mm.

Step 3: Compare visually the digital and reference output:
The 16 grey samples of the digital output of the file L72E05FP.PDF (02FP: lower part of the test chart, only lower part of Fig. C3) must be compared sample by sample with the reference.

Remark: It is recommended to shift for this comparison any sample by the vertical and horizontal rulers of the Acrobat Reader window. The whole window may be shifted in case of larger differences.

Step 3a: If the transparent ISO/IEC-test chart no. 3 is available, then the white samples 15(0) of the reference and digital output are the same. The black samples will appear the same if the monitor screen is adjusted to black (In this case the standard PAL monitor produces for the digital input value 1/255 the monitor luminance (1/255)*(1/255)=1/100.000 which appears equal black compared to the transparent reference with the contrast range 1:10.000). Compare the remaining 14 samples.

Step 3b: If the transparent ISO/IEC-test chart no. 3 is NOT available, then the white sample 15(0) and the black sample 00(F) of the reference and digital output are the same. Only in this case the complete result of the visual comparison is similar to the following data (in general the visual data must be a monotonic data series and not more than one decimal is possible to estimate by visual comparison, e. g. 18.0, 18.4, ..., 95.4):

step and L* of CIELAB color space
00(F) 18.01
01(E) 18.35
02(D) 19.39
03(C) 21.11
04(F) 23.51
05(A) 26.61
06(9) 30.39
07(8) 34.87
08(7) 40.03
09(6) 45.87
10(5) 52.41
11(4) 59.63
12(3) 67.55
13(2) 76.15
14(1) 85.43
15(0) 95.41

Step 4: Replace in the file L72E05FP.PS the original (linear) data of the series white-black W-N by the visual comparison data by any editor

The new data 18.01, 18.35, ... , 85.43, 95.41 (the observer visual estimation 18.0, 18.4, 19.4, ..., 85.4, 95.4) must replace
the old data 18.01, 23.17, ... , 90.25, 95.41 (which are equidistant in CIELAB L*). The old data are in the following table and at the beginning of the file

L72E05FP.PS (Lower part of the test chart, only lower part of Fig. C3)

00 18.01 +0.50 -0.47 %0.000 1.000 N-W L w* setgray (Note: this table starts near line 294 in the FP.PS file)
01 23.17 +0.40 -0.12 %0.067 0.933 N-W L
02 28.33 +0.30 +0.23 %0.133 0.867 N-W L
03 33.49 +0.20 +0.58 %0.200 0.800 N-W L
04 38.65 +0.10 +0.92 %0.267 0.733 N-W L
05 43.81 +0.00 +1.27 %0.333 0.667 N-W L
06 48.97 -0.10 +1.62 %0.400 0.600 N-W L
07 54.13 -0.20 +1.97 %0.467 0.533 N-W L
08 59.29 -0.29 +2.32 %0.533 0.467 N-W L
09 64.45 -0.39 +4.02 %0.667 0.333 N-W L
11 74.77 -0.59 +3.37 %0.733 0.267 N-W L
12 79.93 -0.69 +3.71 %0.800 0.200 N-W L
13 85.09 -0.79 +4.06 %0.867 0.133 N-W L
14 90.25 -0.89 +4.41 %0.933 0.067 N-W L
15 95.41 -0.99 +4.76 %1.000 0.000 N-W L

Step 5: Save the corrected file with the new data and use the file name L72E05FP1.PS. Produce the PDF file L72E05FP1.PDF with the software Adobe Acrobat Distiller.

Step 6: Compare the monitor output of the file L72E05FP1.PDF with the reference (equidistant transparent ISO/IEC-test chart no. 3 on monitor as reference or file output L72E01FP.PDF as reference (which is not equidistant and for a standard PAL monitor the dark steps appear larger).

Result: The output of the 16 steps appears equal in both cases (transparent or digital ISO/IEC-test chart as reference)!

Remark 1: If a Display PostScript system (e. g. Mac OS X, Application Yap) is used for the test, then it is recommended to use the FA.PS files (the PF.PDF files only distinguish by output name from the FA.PDF files and the "P" indicates the "PDF file" method used)

Remark 2. Different versions of the software Adobe Acrobat Distiller may produce different PDF files with different output. If the PDF files are used for the test then it is recommended NOT to use the PDF files from the BAM server but to download the corresponding PS files and to use the local Adobe Acrobat Distiller version with the local settings of this software to transfer the PS files to the PDF files for the whole test.

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