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[ /Title (PostScript pictures: farbe.li.tu-berlin.de/fgo4/fgo4.htm)
/Author (compare K. Richter "Computergrafik ...": ISBN 3-8007-1775-1)
/Subject (goto: http://farbe.li.tu-berlin.de or http://color.li.tu-berlin.de)
/Keywords (image reproduction, colour devices)
/Creator (klaus.richter@mac.com)
/CreationDate (D:2024040112000)
/ModDate (D:20240401112000)
/DOCINFO pdfmark03
[ /View [ /Fit ]
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TIL
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TL (\255Gesetz\255Helligkeit ) showde
( law describes the lightness ) showea
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( ist eine ) showde TBIL (logarithmische ) showde TL (Funktion von ) showde
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ix0 yhod iyds 1 mul sub moveto
TL (The ) showea (Die ) showde
TIL
(Stevens) show
TL (\255Gesetz\255Helligkeit ) showde
( law describes the lightness ) showea
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( ist eine ) showde TBIL (Potenzfunktion ) showde TL (von ) showde
TIL (L) show 0 -30 rmoveto TV (rW) show 10 30 rmoveto
TL (=) show TIL (Y) show TL (/90.) show
ix0 yhod iyds 2 mul sub moveto
TL
%(IEC 61966\2552\2551 uses a similar potential function ) showea
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TBL (, ) show
TBL (Approximation: ) showea
(N\344herung: ) showde
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TBL ( = 100 ) show TBIL (L) show
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TL (The ) showea (Das ) showde
TIL
(Weber\255Fechner) show
TL (\255Gesetz ist \344quivalent zur Gleichung: ) showde
( law is equivalent to the equation: ) showea
SL (D) show TIL (L) show 0 -30 rmoveto TV (rW) show 0 30 rmoveto
TL ( = ) show TIL (c) show
0 -30 rmoveto TV (W) show 0 30 rmoveto
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TIL (L) show 0 -30 rmoveto TV (rW) show 0 30 rmoveto
5750 yhod iyds 3.1 mul sub moveto TL ([2]) show
0 setgray
TL
ix0 yhod iyds 4.2 mul sub moveto
TIL
(Integration ) show
TL (leads to the logarithmic equation: ) showea
(f\374hrt zur logarithmischen Gleichung: ) showde
TIL (L*) show 0 -30 rmoveto TV (rW) show 0 30 rmoveto
TL (=t) show
0 -30 rmoveto TV (W) show 0 30 rmoveto
30 0 rmoveto TL (log\050) show
TIL (L) show 0 -30 rmoveto TV (rW) show 0 30 rmoveto TL (\051.) show
5750 yhod iyds 4.2 mul sub moveto TL ([3]) show
ix0 yhod iyds 5.3 mul sub moveto
TIL
(Derivation ) showea
(Ableitung ) showde
TL (leads for ) showea
(f\374hrt f\374r ) showde
SL (D) show TIL (L*) show 0 -30 rmoveto TV (rW) show 0 30 rmoveto TL (=1 ) show
TL (to the linear equation: ) showea
(zur linearen Gleichung: ) showde
TIL (L) show 0 -30 rmoveto TV (rW) show 0 30 rmoveto
TL (/) show SL (D) show
TIL (L) show 0 -30 rmoveto TV (rW) show 0 30 rmoveto TL (=t) show
0 -30 rmoveto TV (W) show 0 30 rmoveto
TL (=57.) show
5750 yhod iyds 5.3 mul sub moveto TL ([4]) show
ix0 yhod iyds 6.4 mul sub moveto
TL (For ) showea
(f\374r ) showde
TBIL (adjacent ) showea
(aneinandergrenzende ) showde
TL (Colours in offices the standard contrast range is ) showea
(Farben im B\374ro ist der NormKontrastbereich ) showde
TBL (25:1) show TL (=90:3,6) show
(.) show
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/iy15i [0 0 0 0 0 0] def
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%/ty17i[((paper))() () () (=50) (=t*log(1))] def
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/iy17i [0 0 0 0 0 0] def
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/iy19i [0 0 0 0 0 0] def
%**************************************************************************
% 0 1 2 3 4 5
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%**********************************************************************
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%**********************************************************************
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%**********************************************************************
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%**********************************************************************
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%**********************************************************************
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% p2 p1 N D U H W P1 P2
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TBL (Table 1: ) showea (Tabelle 1: ) showde
(CIE tristimulus value ) showea (Normfarbwert ) showde
TBIL (Y, ) show
TBL (luminance ) showea (Leuchtdichte ) showde
TBIL (L) show
TBL (, and lightness ) showea ( und Helligkeit ) showde
TBIL (L* ) show
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0 setgray
TBL
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ixi 0 get iyi 01 get moveto ((matte paper)) showea ((Mattpapier)) showde
ixi 1 get iyi 00 get moveto (tristimu\255) showea (Norm\255) showde
ixi 1 get iyi 01 get moveto (lus values) showea (farbwert) showde
ixi 2 get iyi 00 get moveto (SDR office) showea (SDR\255B\374ro\255) showde
ixi 2 get iyi 01 get moveto (luminance) showea (Leuchtdichte) showde
ixi 3 get iyi 00 get moveto (relative) showea (relative) showde
ixi 3 get iyi 01 get moveto (luminance) showea (Leuchtdichte) showde
ixi 4 get iyi 00 get moveto
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ixi 4 get iyi 01 get moveto (lightness) showea (Helligkeit) showde
ixi 5 get iyi 00 get moveto (TUBLOG) show
0 -50 rmoveto (U) show 0 50 rmoveto
ixi 5 get iyi 01 get moveto (lightness) showea (Helligkeit) showde
0 1 5 {/i exch def
iy02i i get 0 eq {1 1 1 setrgbcolor} if
iy02i i get 1 eq {1 1 0 setrgbcolor} if
iy02i i get 2 eq {0 1 0 setrgbcolor} if
iy02i i get 3 eq {1 0 0 setrgbcolor} if
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/ixd ixi i 1 add get ixi i get sub def
ixd 0 rlineto 0 iyd rlineto
ixd neg 0 rlineto closepath fill
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0 1 5 {/i exch def
iy03i i get 0 eq {1 1 1 setrgbcolor} if
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iy03i i get 3 eq {1 0 0 setrgbcolor} if
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/ixd ixi i 1 add get ixi i get sub def
ixd 0 rlineto 0 iyd rlineto
ixd neg 0 rlineto closepath fill
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0 setgray
/xp 480 def
/yp 20 def
ixi 0 get iyi 02 get yp add moveto TBL (Contrast W:N) showea
(Kontrast W:N) showde
ixi 1 get iyi 02 get yp add moveto TBIL (Y) show
ixi 2 get iyi 02 get yp add moveto TBIL (L) show
ixi 3 get iyi 02 get yp add moveto TBIL (L) show
0 -30 rmoveto TBV (rU) show 0 30 rmoveto
ispace 2 eq {%CIELAB_W
ixi 4 get iyi 02 get yp add moveto TBIL (L*) show
-20 -30 rmoveto TBV (CIELAB_W) show 0 30 rmoveto
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ispace 4 eq {%IECsRGB_W
ixi 4 get iyi 02 get yp add moveto TBIL (L*) show
-20 -30 rmoveto TBV (IECsRGB_W) show 0 30 rmoveto
} if %CIELAB_W
ixi 5 get iyi 02 get yp add moveto TBIL (L*) show
-0 -30 rmoveto TBV (TUBLOG_U) show 0 30 rmoveto
ixi 0 get iyi 03 get moveto TBL ((25:1=90:3,6)) show
ixi 1 get iyi 03 get moveto () show
ixi 2 get iyi 03 get moveto TBL ([cd/m) show
0 40 rmoveto TBV (2) show 0 -40 rmoveto
TBL (]) show
ixi 3 get iyi 03 get moveto TBIL (=L/L) show
0 -30 rmoveto TBV (U) show 0 30 rmoveto
ixi 3 get xp add iyi 03 get moveto
TBIL (=L/L) show
0 -30 rmoveto TBV (W) show 0 30 rmoveto
ispace 2 eq {%CIELAB_W
ixi 4 get -20 0 rmoveto
iyi 03 get moveto TBL (=c) show
0 -30 rmoveto TBV (W) show 0 30 rmoveto
0 0 rmoveto TBIL (L) show
0 -30 rmoveto TBV (rW) show 0 30 rmoveto
0 40 rmoveto TBV (1/3) show 0 -40 rmoveto
TBL (-16) show
} if %CIELAB_W
%ispace 1 eq {%TUBLOG_U allways
ixi 5 get -20 0 rmoveto
iyi 03 get moveto TBIL (=t) show
0 -30 rmoveto TBV (U) show 0 30 rmoveto
0 0 rmoveto TBL (log\050) show TBIL (L) show
0 -30 rmoveto TBV (rU) show 0 30 rmoveto
TBL (\051+50) show
% } if %TUBLOG_U
ispace 4 eq {%IECsRGB_W
ixi 4 get -20 0 rmoveto
iyi 03 get moveto TBL (=s) show
0 -30 rmoveto TBV (W) show 0 30 rmoveto
0 0 rmoveto TBIL (L) show
0 -30 rmoveto TBV (rW) show 0 30 rmoveto
0 50 rmoveto TBV (1/2,4) show 0 -50 rmoveto
} if %IECsRGB_W
0 setgray
0 1 5 {/i exch def
iy14i i get 0 eq {1 1 1 setrgbcolor} if
iy14i i get 1 eq {1 1 0 setrgbcolor} if
iy14i i get 2 eq {0 1 0 setrgbcolor} if
iy14i i get 3 eq {1 0 0 setrgbcolor} if
ixi i get ixs sub iyi 04 get ixs sub moveto
/ixd ixi i 1 add get ixi i get sub def
ixd 0 rlineto 0 iyd rlineto
ixd neg 0 rlineto closepath fill
} for
0 1 5 {/i exch def
iy15i i get 0 eq {1 1 1 setrgbcolor} if
iy15i i get 1 eq {1 1 0 setrgbcolor} if
iy15i i get 2 eq {0 1 0 setrgbcolor} if
iy15i i get 3 eq {1 0 0 setrgbcolor} if
ixi i get ixs sub iyi 05 get ixs sub moveto
/ixd ixi i 1 add get ixi i get sub def
ixd 0 rlineto 0 iyd rlineto
ixd neg 0 rlineto closepath fill
} for
0 setgray
TL
ixi 0 get iyi 04 get moveto ty14i 0 get showea dy14i 0 get showde
ixi 1 get iyi 04 get moveto ty14i 1 get showea dy14i 1 get showde
ixi 2 get iyi 04 get moveto ty14i 2 get showea dy14i 2 get showde
ixi 3 get iyi 04 get moveto ty14i 3 get showea dy14i 3 get showde
ixi 4 get iyi 04 get moveto ty14i 4 get showea dy14i 4 get showde
ixi 5 get iyi 04 get moveto ty14i 5 get showea dy14i 5 get showde
ixi 0 get iyi 05 get moveto ty15i 0 get showea dy15i 0 get showde
ixi 1 get iyi 05 get moveto ty15i 1 get showea dy15i 1 get showde
ixi 2 get iyi 05 get moveto ty15i 2 get showea dy15i 2 get showde
ixi 3 get iyi 05 get moveto ty15i 3 get showea dy15i 3 get showde
ixi 4 get iyi 05 get moveto ty15i 4 get showea dy15i 4 get showde
ixi 5 get iyi 05 get moveto ty15i 5 get showea dy15i 5 get showde
%=t log(5)
%1 0 0 setrgbcolor
ixi 5 get -20 0 rmoveto iyi 05 get moveto
TIL (=t) show 00 0 rmoveto TL (log(5)+50) show
0 setgray
0 1 5 {/i exch def
iy16i i get 0 eq {1 1 1 setrgbcolor} if
iy16i i get 1 eq {1 1 0 setrgbcolor} if
iy16i i get 2 eq {0 1 0 setrgbcolor} if
iy16i i get 3 eq {1 0 0 setrgbcolor} if
ixi i get ixs sub iyi 06 get ixs sub moveto
/ixd ixi i 1 add get ixi i get sub def
ixd 0 rlineto 0 iyd rlineto
ixd neg 0 rlineto closepath fill
} for
0 1 5 {/i exch def
iy17i i get 0 eq {1 1 1 setrgbcolor} if
iy17i i get 1 eq {1 1 0 setrgbcolor} if
iy17i i get 2 eq {0 1 0 setrgbcolor} if
iy17i i get 3 eq {1 0 0 setrgbcolor} if
ixi i get ixs sub iyi 07 get ixs sub moveto
/ixd ixi i 1 add get ixi i get sub def
ixd 0 rlineto 0 iyd rlineto
ixd neg 0 rlineto closepath fill
} for
0 setgray
TL
ixi 0 get iyi 06 get moveto ty16i 0 get showea dy16i 0 get showde
ixi 1 get iyi 06 get moveto ty16i 1 get showea dy16i 1 get showde
ixi 2 get iyi 06 get moveto ty16i 2 get showea dy16i 2 get showde
ixi 3 get iyi 06 get moveto ty16i 3 get showea dy16i 3 get showde
ixi 4 get iyi 06 get moveto ty16i 4 get showea dy16i 4 get showde
ixi 5 get iyi 06 get moveto ty16i 5 get showea dy16i 5 get showde
ixi 0 get iyi 07 get moveto ty17i 0 get showea dy17i 0 get showde
ixi 1 get iyi 07 get moveto ty17i 1 get showea dy17i 1 get showde
ixi 2 get iyi 07 get moveto ty17i 2 get showea dy17i 2 get showde
ixi 3 get iyi 07 get moveto ty17i 3 get showea dy17i 3 get showde
ixi 4 get iyi 07 get moveto ty17i 4 get showea dy17i 4 get showde
ixi 5 get iyi 07 get moveto ty17i 5 get showea dy17i 5 get showde
%=t log(1)
%1 0 0 setrgbcolor
ixi 5 get iyi 07 get moveto
TIL (=t) show 20 0 rmoveto TL (log(1)+50) show
0 setgray
0 1 5 {/i exch def
iy18i i get 0 eq {1 1 1 setrgbcolor} if
iy18i i get 1 eq {1 1 0 setrgbcolor} if
iy18i i get 2 eq {0 1 0 setrgbcolor} if
iy18i i get 3 eq {1 0 0 setrgbcolor} if
ixi i get ixs sub iyi 08 get ixs sub moveto
/ixd ixi i 1 add get ixi i get sub def
ixd 0 rlineto 0 iyd rlineto
ixd neg 0 rlineto closepath fill
} for
0 1 5 {/i exch def
iy19i i get 0 eq {1 1 1 setrgbcolor} if
iy19i i get 1 eq {1 1 0 setrgbcolor} if
iy19i i get 2 eq {0 1 0 setrgbcolor} if
iy19i i get 3 eq {1 0 0 setrgbcolor} if
ixi i get ixs sub iyi 09 get ixs sub moveto
/ixd ixi i 1 add get ixi i get sub def
ixd 0 rlineto 0 iyd rlineto
ixd neg 0 rlineto closepath fill
} for
0 setgray
TL
ixi 0 get iyi 08 get moveto ty18i 0 get showea dy18i 0 get showde
ixi 1 get iyi 08 get moveto ty18i 1 get showea dy18i 1 get showde
ixi 2 get iyi 08 get moveto ty18i 2 get showea dy18i 2 get showde
ixi 3 get iyi 08 get moveto ty18i 3 get showea dy18i 3 get showde
ixi 4 get iyi 08 get moveto ty18i 4 get showea dy18i 4 get showde
ixi 5 get iyi 08 get moveto ty18i 5 get showea dy18i 5 get showde
ixi 0 get iyi 09 get moveto ty19i 0 get showea dy19i 0 get showde
ixi 1 get iyi 09 get moveto ty19i 1 get showea dy19i 1 get showde
ixi 2 get iyi 09 get moveto ty19i 2 get showea dy19i 2 get showde
ixi 3 get iyi 09 get moveto ty19i 3 get showea dy19i 3 get showde
ixi 4 get iyi 09 get moveto ty19i 4 get showea dy19i 4 get showde
ixi 5 get iyi 09 get moveto ty19i 5 get showea dy19i 5 get showde
%=t log(5)
%1 0 0 setrgbcolor
ixi 5 get iyi 09 get moveto
TIL (=t) show 20 0 rmoveto TL (log(0,2)+50) show
0 setgray
20 setlinewidth
/lupt iytab iyd add 40 sub 20 add def
/llot iytab iyd 9 mul sub 40 sub def
/ldit lupt llot sub def
0 lupt 20 add moveto xwidth 0 rlineto stroke %line upper table
1 1 5 {/i exch def %i=1,5
ixi i get ixs sub llot 10 add moveto 0 ldit rlineto stroke
} for %i=1,5
%horizontal lines
1 2 9 {/i exch def %i=1,9,2
0 iyi i get 60 sub moveto
xwidth 0 rlineto stroke
} for %i=1,9,2
%Lu/Lw special vertical line
ixi 3 get xp add 20 sub llot 10 sub moveto
0 ldit iyd 2 mul sub 00 sub rlineto stroke
0 1 8 {/i exch def %i=0,8
/Ynref Y_refi i get def
ispace 2 eq {proz_Y_L*_CIELAB_W} if
ispace 3 eq {proz_Y_L*_CIELAB_U} if
ispace 4 eq {proz_Y_L*_IECsRGB_W} if
L*refi i L*ref put
} for %i=0,8
ixi 4 get iyi 08 get moveto L*refi 2 get cvishow
(=50) show L*refi 2 get 50 sub cvishow %N
ixi 4 get iyi 06 get moveto L*refi 4 get cvishow
(=50) show L*refi 4 get 50 sub cvishow %U
ixi 4 get iyi 04 get moveto L*refi 6 get cvishow
(=50+) show L*refi 6 get 50 sub cvishow %W
ispace 2 eq {%CIELAB_W
ixi 4 get iyi 09 get moveto TL (=c(0,04)) show
TV 0 50 rmoveto (1/3) show 0 -50 rmoveto TL (-16) show
ixi 4 get iyi 07 get moveto TL (=c(0,2)) show
TV 0 50 rmoveto (1/3) show 0 -50 rmoveto TL (-16) show
ixi 4 get iyi 05 get moveto TL (=c(1)) show
TV 0 50 rmoveto (1/3) show 0 -50 rmoveto TL (-16) show
} if %CIELAB_W
ispace 3 eq {%CIELAB_U
ixi 4 get iyi 09 get moveto TL (=c(0,2)) show
TV 0 50 rmoveto (1/3) show 0 -50 rmoveto TL (-16) show
ixi 4 get iyi 07 get moveto TL (=c(1,0)) show
TV 0 50 rmoveto (1/3) show 0 -50 rmoveto TL (-16) show
ixi 4 get iyi 05 get moveto TL (=c(5)) show
TV 0 50 rmoveto (1/3) show 0 -50 rmoveto TL (-16) show
} if %CIELAB_U
ispace 4 eq {%IECsRGB_W
ixi 4 get iyi 09 get moveto TL (=c(0,04)) show
TV 0 50 rmoveto (1/2,4) show 0 -50 rmoveto TL
ixi 4 get iyi 07 get moveto TL (=c(0,2)) show
TV 0 50 rmoveto (1/2,4) show 0 -50 rmoveto TL
ixi 4 get iyi 05 get moveto TL (=c(1)) show
TV 0 50 rmoveto (1/2,4) show 0 -50 rmoveto TL
} if %IECsRGB_W
0 1 8 {/i exch def %i=0,8
/Ynref Y_refi i get def
proz_Y_L*_TUBLOG_U
L*refi i L*ref 50 add put
} for %i=0,8
ixi 5 get iyi 08 get moveto L*refi 2 get cvishow
(=50-) show L*refi 2 get 50 sub abs cvishow %N
ixi 5 get iyi 06 get moveto L*refi 4 get cvishow
(=50+) show L*refi 4 get 50 sub cvishow %U
ixi 5 get iyi 04 get moveto L*refi 6 get cvishow
(=50+) show L*refi 6 get 50 sub cvishow %W
ixi 3 get xp add iyi 02 get moveto
TBIL (L) show 0 -30 rmoveto TBV (rW) show 0 30 rmoveto
ixi 3 get xp add iyi 03 get moveto
TBIL (=L/L) show 0 -30 rmoveto TBV (W) show 0 30 rmoveto
TL ixi 3 get xp add iyi 04 get moveto (1) show
TL ixi 3 get xp add iyi 06 get moveto (0,2) show
TL ixi 3 get xp add iyi 08 get moveto (0,04) show
ix0 0070 moveto
TL (It is valid: ) showea
(Es gilt: ) showde
ispace 2 eq {%CIELAB_W
TL (CIELAB) show TV 0 -30 rmoveto (W) show 0 30 rmoveto
TL (: c) show TV 0 -30 rmoveto (W) show 0 30 rmoveto
TL (=c) show
TL (=116, ) show
} if %CIELAB_W
ispace 3 eq {%CIELAB_U
TL (CIELAB) show TV 0 -30 rmoveto (U) show 0 30 rmoveto
TL (: c) show TV 0 -30 rmoveto (U) show 0 30 rmoveto
TL (=c) show
TL (=66, ) show
} if %CIELAB_U
ispace 4 eq {%IECsRGB_W
TL (IECsRGB) show TV 0 -30 rmoveto (W) show 0 30 rmoveto
TL (: d) show TV 0 -30 rmoveto (W) show 0 30 rmoveto
TL (=d) show
TL (=100, ) show
} if %IECsRGB_W
TL (TUBLOG) show TV 0 -30 rmoveto (U) show 0 30 rmoveto
TL (: t) show TV 0 -30 rmoveto (U) show 0 30 rmoveto
TL (=t) show
TL (=) show TL (50/log(5)=57) show
/yhoe 4000 def /xwidth xwidth def
15 setlinewidth
0 setgray
0 0 moveto xwidth 0 rlineto 0 yhoe rlineto xwidth neg 0 rlineto
closepath stroke
%*****************************************************************
grestore %end because of clip
showpage
grestore
%%Trailer