%!PS-Adobe-2.0 %%Version: 0.1 %%DocumentFonts: (atend) %%Pages: (atend) %%EndComments % % Version 3.3.2 prologue for troff files. % /#copies 1 store /aspectratio 1 def /formsperpage 1 def /landscape false def /linewidth .3 def /magnification 1 def /margin 0 def /orientation 0 def /resolution 720 def /rotation 1 def /xoffset 0 def /yoffset 0 def /roundpage true def /useclippath true def /pagebbox [0 0 612 792] def /R /Times-Roman def /I /Times-Italic def /B /Times-Bold def /BI /Times-BoldItalic def /H /Helvetica def /HI /Helvetica-Oblique def /HB /Helvetica-Bold def /HX /Helvetica-BoldOblique def /CW /Courier def /CO /Courier def /CI /Courier-Oblique def /CB /Courier-Bold def /CX /Courier-BoldOblique def /PA /Palatino-Roman def /PI /Palatino-Italic def /PB /Palatino-Bold def /PX /Palatino-BoldItalic def /Hr /Helvetica-Narrow def /Hi /Helvetica-Narrow-Oblique def /Hb /Helvetica-Narrow-Bold def /Hx /Helvetica-Narrow-BoldOblique def /KR /Bookman-Light def /KI /Bookman-LightItalic def /KB /Bookman-Demi def /KX /Bookman-DemiItalic def /AR /AvantGarde-Book def /AI /AvantGarde-BookOblique def /AB /AvantGarde-Demi def /AX /AvantGarde-DemiOblique def /NR /NewCenturySchlbk-Roman def /NI /NewCenturySchlbk-Italic def /NB /NewCenturySchlbk-Bold def /NX /NewCenturySchlbk-BoldItalic def /ZD /ZapfDingbats def /ZI /ZapfChancery-MediumItalic def /S /S def /S1 /S1 def /GR /Symbol def /inch {72 mul} bind def /min {2 copy gt {exch} if pop} bind def /setup { counttomark 2 idiv {def} repeat pop landscape {/orientation 90 orientation add def} if /scaling 72 resolution div def linewidth setlinewidth 1 setlinecap pagedimensions xcenter ycenter translate orientation rotation mul rotate width 2 div neg height 2 div translate xoffset inch yoffset inch neg translate margin 2 div dup neg translate magnification dup aspectratio mul scale scaling scaling scale addmetrics 0 0 moveto } def /pagedimensions { useclippath userdict /gotpagebbox known not and { /pagebbox [clippath pathbbox newpath] def roundpage currentdict /roundpagebbox known and {roundpagebbox} if } if pagebbox aload pop 4 -1 roll exch 4 1 roll 4 copy landscape {4 2 roll} if sub /width exch def sub /height exch def add 2 div /xcenter exch def add 2 div /ycenter exch def userdict /gotpagebbox true put } def /addmetrics { /Symbol /S null Sdefs cf /Times-Roman /S1 StandardEncoding dup length array copy S1defs cf } def /pagesetup { /page exch def currentdict /pagedict known currentdict page known and { page load pagedict exch get cvx exec } if } def /decodingdefs [ {counttomark 2 idiv {y moveto show} repeat} {neg /y exch def counttomark 2 idiv {y moveto show} repeat} {neg moveto {2 index stringwidth pop sub exch div 0 32 4 -1 roll widthshow} repeat} {neg moveto {spacewidth sub 0.0 32 4 -1 roll widthshow} repeat} {counttomark 2 idiv {y moveto show} repeat} {neg setfunnytext} ] def /setdecoding {/t decodingdefs 3 -1 roll get bind def} bind def /w {neg moveto show} bind def /m {neg dup /y exch def moveto} bind def /done {/lastpage where {pop lastpage} if} def /f { dup /font exch def findfont exch dup /ptsize exch def scaling div dup /size exch def scalefont setfont linewidth ptsize mul scaling 10 mul div setlinewidth /spacewidth ( ) stringwidth pop def } bind def /changefont { /fontheight exch def /fontslant exch def currentfont [ 1 0 fontheight ptsize div fontslant sin mul fontslant cos div fontheight ptsize div 0 0 ] makefont setfont } bind def /sf {f} bind def /cf { dup length 2 idiv /entries exch def /chtab exch def /newencoding exch def /newfont exch def findfont dup length 1 add dict /newdict exch def {1 index /FID ne {newdict 3 1 roll put}{pop pop} ifelse} forall newencoding type /arraytype eq {newdict /Encoding newencoding put} if newdict /Metrics entries dict put newdict /Metrics get begin chtab aload pop 1 1 entries {pop def} for newfont newdict definefont pop end } bind def % % A few arrays used to adjust reference points and character widths in some % of the printer resident fonts. If square roots are too high try changing % the lines describing /radical and /radicalex to, % % /radical [0 -75 550 0] % /radicalex [-50 -75 500 0] % % Move braceleftbt a bit - default PostScript character is off a bit. % /Sdefs [ /bracketlefttp [201 500] /bracketleftbt [201 500] /bracketrighttp [-81 380] /bracketrightbt [-83 380] /braceleftbt [203 490] /bracketrightex [220 -125 500 0] /radical [0 0 550 0] /radicalex [-50 0 500 0] /parenleftex [-20 -170 0 0] /integral [100 -50 500 0] /infinity [10 -75 730 0] ] def /S1defs [ /underscore [0 80 500 0] /endash [7 90 650 0] ] def % % Tries to round clipping path dimensions, as stored in array pagebbox, so they % match one of the known sizes in the papersizes array. Lower left coordinates % are always set to 0. % /roundpagebbox { 7 dict begin /papersizes [8.5 inch 11 inch 14 inch 17 inch] def /mappapersize { /val exch def /slop .5 inch def /diff slop def /j 0 def 0 1 papersizes length 1 sub { /i exch def papersizes i get val sub abs dup diff le {/diff exch def /j i def} {pop} ifelse } for diff slop lt {papersizes j get} {val} ifelse } def pagebbox 0 0 put pagebbox 1 0 put pagebbox dup 2 get mappapersize 2 exch put pagebbox dup 3 get mappapersize 3 exch put end } bind def %%EndProlog %%BeginSetup mark % % Encoding vector and redefinition of findfont for the ISO Latin1 standard. % The 18 characters missing from ROM based fonts on older printers are noted % below. % /ISOLatin1Encoding [ /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /space /exclam /quotedbl /numbersign /dollar /percent /ampersand /quoteright /parenleft /parenright /asterisk /plus /comma /minus /period /slash /zero /one /two /three /four /five /six /seven /eight /nine /colon /semicolon /less /equal /greater /question /at /A /B /C /D /E /F /G /H /I /J /K /L /M /N /O /P /Q /R /S /T /U /V /W /X /Y /Z /bracketleft /backslash /bracketright /asciicircum /underscore /quoteleft /a /b /c /d /e /f /g /h /i /j /k /l /m /n /o /p /q /r /s /t /u /v /w /x /y /z /braceleft /bar /braceright /asciitilde /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /dotlessi /grave /acute /circumflex /tilde /macron /breve /dotaccent /dieresis /.notdef /ring /cedilla /.notdef /hungarumlaut /ogonek /caron /space /exclamdown /cent /sterling /currency /yen /brokenbar % missing /section /dieresis /copyright /ordfeminine /guillemotleft /logicalnot /hyphen /registered /macron /degree % missing /plusminus % missing /twosuperior % missing /threesuperior % missing /acute /mu % missing /paragraph /periodcentered /cedilla /onesuperior % missing /ordmasculine /guillemotright /onequarter % missing /onehalf % missing /threequarters % missing /questiondown /Agrave /Aacute /Acircumflex /Atilde /Adieresis /Aring /AE /Ccedilla /Egrave /Eacute /Ecircumflex /Edieresis /Igrave /Iacute /Icircumflex /Idieresis /Eth % missing /Ntilde /Ograve /Oacute /Ocircumflex /Otilde /Odieresis /multiply % missing /Oslash /Ugrave /Uacute /Ucircumflex /Udieresis /Yacute % missing /Thorn % missing /germandbls /agrave /aacute /acircumflex /atilde /adieresis /aring /ae /ccedilla /egrave /eacute /ecircumflex /edieresis /igrave /iacute /icircumflex /idieresis /eth % missing /ntilde /ograve /oacute /ocircumflex /otilde /odieresis /divide % missing /oslash /ugrave /uacute /ucircumflex /udieresis /yacute % missing /thorn % missing /ydieresis ] def /NewFontDirectory FontDirectory maxlength dict def % % Apparently no guarantee findfont is defined in systemdict so the obvious % % systemdict /findfont get exec % % can generate an error. So far the only exception is a VT600 (version 48.0). % userdict /@RealFindfont known not { userdict begin /@RealFindfont systemdict begin /findfont load end def end } if /findfont { dup NewFontDirectory exch known not { dup %dup systemdict /findfont get exec % not always in systemdict dup userdict /@RealFindfont get exec dup /Encoding get StandardEncoding eq { dup length dict begin {1 index /FID ne {def}{pop pop} ifelse} forall /Encoding ISOLatin1Encoding def currentdict end /DummyFontName exch definefont } if NewFontDirectory 3 1 roll put } if NewFontDirectory exch get } bind def setup %%EndSetup %%Page: 1 1 /saveobj save def mark 1 pagesetup 12 /Times-Bold f (Pnmgamma User) 2220 1230 w (Manual) 3139 1230 w 10 /Times-Bold f (pnmgamma) 720 1920 w 10 /Times-Roman f (Updated: 18 February 2006) 720 2076 w (Table Of Contents) 720 2196 w 10 /Times-Bold f (NAME) 720 2436 w 10 /Times-Roman f (pnmgamma \255 perform gamma correction on a PNM image) 720 2592 w 10 /Times-Bold f (SYNOPSIS) 720 2832 w (pnmgamma) 720 2988 w 10 /Times-Roman f ([) 720 3108 w 10 /Times-Bold f (\255bt709ramp) 778 3108 w 10 /Times-Roman f 10 /S f (\357) 1308 3108 w 10 /Times-Bold f (\255srgbramp) 1382 3108 w 10 /Times-Roman f 10 /S f (\357) 1862 3108 w 10 /Times-Roman f (] [) 1936 3108 w 10 /Times-Bold f (\255ungamma) 2027 3108 w 10 /Times-Roman f (]) 2488 3108 w ([) 720 3228 w 10 /Times-Italic f (gamma) 753 3228 w 10 /S f (\357) 1078 3228 w 10 /Times-Italic f (redgamma) 1158 3228 w (greengamma) 1616 3228 w (bluegamma) 2168 3228 w 10 /Times-Roman f ([) 2665 3228 w 10 /Times-Italic f (pnmfile) 2698 3228 w 10 /Times-Roman f (]]) 2998 3228 w 10 /Times-Bold f (pnmgamma) 3095 3228 w 10 /Times-Roman f ({) 3637 3228 w 10 /Times-Bold f (\255bt709tolinear) 3717 3228 w 10 /S f (\357) 4354 3228 w 10 /Times-Bold f (\255lineartobt709) 4435 3228 w 10 /S f (\357) 720 3348 w 10 /Times-Bold f (\255bt709tosrgb) 808 3348 w 10 /S f (\357) 1391 3348 w 10 /Times-Bold f (\255srgbtobt709) 1479 3348 w 10 /Times-Roman f (}) 2062 3348 w ([) 2149 3348 w 10 /Times-Bold f (\255gamma=) 2182 3348 w 10 /Times-Italic f (float) 2588 3348 w 10 /Times-Roman f (]) 2772 3348 w ([) 2844 3348 w 10 /Times-Bold f (\255rgamma=) 2877 3348 w 10 /Times-Italic f (float) 3327 3348 w 10 /Times-Roman f (]) 3511 3348 w ([) 3583 3348 w 10 /Times-Bold f (\255ggamma=) 3616 3348 w 10 /Times-Italic f (float) 4072 3348 w 10 /Times-Roman f (]) 4256 3348 w ([) 4328 3348 w 10 /Times-Bold f (\255bgamma=) 4361 3348 w 10 /Times-Italic f (float) 4823 3348 w 10 /Times-Roman f (]) 5007 3348 w ([) 720 3468 w 10 /Times-Italic f (pnmfile) 753 3468 w 10 /Times-Roman f (]) 1053 3468 w 10 /Times-Bold f (DESCRIPTION) 720 3708 w 10 /Times-Roman f (This program is part of Netpbm.) 720 3900 w 10 /Times-Bold f (Pnmgamma) 720 4056 w 10 /Times-Roman f (performs gamma correction on pseudo\255PNM images.) 1261 4056 w (The) 720 4212 w (PPM) 901 4212 w (format) 1128 4212 w (specification) 1420 4212 w (specifies) 1956 4212 w (that) 2331 4212 w (certain) 2507 4212 w (sample) 2805 4212 w (values) 3115 4212 w (in) 3397 4212 w (a) 3502 4212 w (file) 3573 4212 w (represent) 3733 4212 w (certain) 4125 4212 w (light) 4423 4212 w (intensities) 4634 4212 w (in) 720 4332 w (an) 836 4332 w (image.) 968 4332 w (In) 1300 4332 w (particular,) 1421 4332 w (they) 1866 4332 w (specify) 2075 4332 w (that) 2400 4332 w (the) 2587 4332 w (sample) 2746 4332 w (values) 3066 4332 w (are) 3358 4332 w (directly) 3516 4332 w (proportional) 3858 4332 w (to) 4389 4332 w (luminance) 4504 4332 w (as) 4957 4332 w (defined by ITU\255R Recommendation BT.709.) 720 4452 w (However,) 720 4608 w (people) 1141 4608 w (sometimes) 1438 4608 w (work) 1898 4608 w (with) 2135 4608 w (approximations) 2345 4608 w (of) 2999 4608 w (PPM) 3114 4608 w (and) 3347 4608 w (PGM) 3523 4608 w (where) 3772 4608 w (the) 4047 4608 w (sample) 4201 4608 w (values) 4516 4608 w (repre\255) 4803 4608 w (sent) 720 4728 w (intensity) 913 4728 w (in) 1290 4728 w (different) 1400 4728 w (ways.) 1775 4728 w (For) 2062 4728 w (example,) 2233 4728 w (the) 2628 4728 w (sample) 2782 4728 w (value) 3096 4728 w (might) 3343 4728 w (be) 3608 4728 w (directly) 3733 4728 w (proportional) 4069 4728 w (to) 4594 4728 w (radiance) 4703 4728 w (\(often) 720 4848 w (called) 997 4848 w ("linear) 1274 4848 w (intensity"\).) 1582 4848 w (Or) 2091 4848 w (a) 2236 4848 w (different) 2320 4848 w (gamma) 2703 4848 w (transfer) 3037 4848 w (function) 3381 4848 w (may) 3754 4848 w (be) 3966 4848 w (used.) 4100 4848 w (The) 4373 4848 w (relationship) 4568 4848 w (between the sample values and radiance is often called a gamma transfer function.) 720 4968 w 10 /Times-Bold f (pnmgamma) 720 5124 w 10 /Times-Roman f (allows) 1272 5124 w (you) 1574 5124 w (to) 1766 5124 w (manipulate) 1886 5124 w (the) 2372 5124 w (gamma) 2536 5124 w (transfer) 2872 5124 w (function,) 3218 5124 w (thus) 3618 5124 w (working) 3827 5124 w (with) 4202 5124 w (and/or) 4422 5124 w (creating) 4719 5124 w (pseudo\255PPM files that are useful for various things.) 720 5244 w (For example, if you feed a true PPM to) 720 5400 w 10 /Courier f (pnmgamma \255bt709tolinear) 2307 5400 w 10 /Times-Roman f (, you get as output) 3712 5400 w (a) 4474 5400 w (file) 4544 5400 w (which) 4703 5400 w (is) 4973 5400 w (PPM) 720 5520 w (in) 954 5520 w (every) 1065 5520 w (respect) 1319 5520 w (except) 1634 5520 w (that) 1927 5520 w (the) 2109 5520 w (sample) 2263 5520 w (values) 2578 5520 w (are) 2865 5520 w (radiances.) 3018 5520 w (If) 3476 5520 w (you) 3574 5520 w (feed) 3756 5520 w (such) 3959 5520 w (a) 4174 5520 w (file) 4250 5520 w (to) 4415 5520 w 10 /Courier f (pnmgamma) 4560 5520 w (\255linearto709) 720 5640 w 10 /Times-Roman f (, you get back a true PPM.) 1440 5640 w (The situation for PGM images is analogous.) 720 5796 w (And) 2533 5796 w 10 /Times-Bold f (pnmgamma) 2730 5796 w 10 /Times-Roman f (treats PBM images as PGM images.) 3266 5796 w (When) 720 5952 w (you) 989 5952 w (feed) 1170 5952 w (a) 1372 5952 w (radiance\255proportional) 1447 5952 w (pseudo\255PPM) 2342 5952 w (image) 2890 5952 w (to) 3165 5952 w (a) 3274 5952 w (display) 3349 5952 w (program) 3669 5952 w (that) 4038 5952 w (expects) 4220 5952 w (a) 4551 5952 w (true) 4627 5952 w (PPM,) 4814 5952 w (the) 720 6072 w (display) 869 6072 w (appears) 1185 6072 w (darker) 1516 6072 w (than) 1797 6072 w (it) 1996 6072 w (should,) 2079 6072 w (so) 2398 6072 w 10 /Times-Bold f (pnmgamma) 2514 6072 w 10 /Times-Roman f (has) 3052 6072 w (the) 3212 6072 w (effect) 3361 6072 w (of) 3614 6072 w (lightening) 3724 6072 w (the) 4157 6072 w (image.) 4306 6072 w (When) 4626 6072 w (you) 4890 6072 w (feed) 720 6192 w (a) 920 6192 w (true) 993 6192 w (PPM) 1177 6192 w (to) 1407 6192 w (a) 1514 6192 w (display) 1587 6192 w (program) 1905 6192 w (that) 2272 6192 w (expects) 2451 6192 w (radiance\255proportional) 2779 6192 w (sample) 3672 6192 w (values,) 3984 6192 w (and) 4294 6192 w (therefore) 4468 6192 w (does) 4857 6192 w (a) 720 6312 w (gamma) 797 6312 w (correction) 1124 6312 w (of) 1561 6312 w (its) 1677 6312 w (own) 1805 6312 w (on) 2010 6312 w (them,) 2143 6312 w (the) 2401 6312 w (display) 2556 6312 w (appears) 2877 6312 w (lighter) 3213 6312 w (than) 3506 6312 w (it) 3710 6312 w (should,) 3798 6312 w (so) 4122 6312 w 10 /Times-Bold f (pnmgamma) 4243 6312 w 10 /Times-Roman f (with) 4786 6312 w (a) 4996 6312 w (gamma) 720 6432 w (value) 1042 6432 w (less) 1286 6432 w (than) 1465 6432 w (one) 1666 6432 w (\(the) 1839 6432 w (multiplicative) 2023 6432 w (inverse) 2608 6432 w (of) 2925 6432 w (whatever) 3037 6432 w (gamma) 3431 6432 w (value) 3754 6432 w (the) 3999 6432 w (display) 4150 6432 w (program) 4468 6432 w (uses\)) 4835 6432 w (has the effect of darkening the image.) 720 6552 w 10 /Times-Bold f (PARAMETERS) 720 6792 w 10 /Times-Roman f (The) 720 6984 w (form) 907 6984 w (of) 1133 6984 w (the) 1248 6984 w (parameters) 1402 6984 w (depends) 1871 6984 w (on) 2231 6984 w (whether) 2364 6984 w (you're) 2718 6984 w (using) 3011 6984 w (the) 3261 6984 w (old) 3416 6984 w (syntax) 3577 6984 w (or) 3871 6984 w (the) 3987 6984 w (new) 4142 6984 w (syntax.) 4341 6984 w (With) 4685 6984 w (the) 4918 6984 w (old) 720 7104 w (syntax,) 881 7104 w (the) 1200 7104 w (parameters) 1355 7104 w (are) 1825 7104 w (a) 1979 7104 w (mixture) 2056 7104 w (of) 2400 7104 w (gamma) 2516 7104 w (values) 2843 7104 w (and) 3131 7104 w (the) 3308 7104 w (input) 3463 7104 w (file) 3702 7104 w (name.) 3868 7104 w (With) 4167 7104 w (the) 4400 7104 w (new) 4555 7104 w (syntax,) 4754 7104 w (the only parameter is the input file name and you specify gamma values with option.) 720 7224 w cleartomark showpage saveobj restore %%EndPage: 1 1 %%Page: 2 2 /saveobj save def mark 2 pagesetup 10 /Times-Roman f (\255 2 \255) 2797 480 w (You) 720 840 w (use) 920 840 w (the) 1081 840 w (old) 1232 840 w (syntax) 1389 840 w (if) 1679 840 w (you) 1769 840 w (specify) 1948 840 w 10 /Times-Bold f (\255bt709ramp) 2265 840 w 10 /Times-Roman f (\(or) 2799 840 w (its) 2944 840 w (synonym) 3068 840 w 10 /Times-Bold f (\255cieramp) 3464 840 w 10 /Times-Roman f (\)) 3846 840 w (or) 3908 840 w 10 /Times-Bold f (\255srgramp) 4020 840 w 10 /Times-Roman f (or) 4448 840 w (if) 4560 840 w (you) 4650 840 w (don't) 4829 840 w (specify) 720 960 w (any) 1039 960 w (transfer) 1214 960 w (function) 1549 960 w (at) 1913 960 w (all) 2015 960 w (\(and) 2145 960 w (thus) 2352 960 w (default) 2549 960 w (to) 2856 960 w (a) 2964 960 w (simple) 3038 960 w (exponential\).) 3335 960 w (Otherwise,) 3914 960 w (you) 4379 960 w (use) 4559 960 w (the) 4722 960 w (new) 4874 960 w (syntax.) 720 1080 w (With) 720 1236 w (the) 953 1236 w (old) 1108 1236 w (syntax,) 1269 1236 w (you) 1588 1236 w (may) 1771 1236 w (specify) 1976 1236 w (a) 2297 1236 w (single) 2374 1236 w (gamma) 2646 1236 w (value) 2973 1236 w (or) 3222 1236 w (3) 3338 1236 w (separate) 3421 1236 w (gamma) 3780 1236 w (values) 4108 1236 w (\(red,) 4397 1236 w (green,) 4616 1236 w (and) 4896 1236 w (blue\)) 720 1356 w (or) 955 1356 w (no) 1068 1356 w (gamma) 1198 1356 w (values.) 1522 1356 w (In) 1857 1356 w (any) 1970 1356 w (case,) 2144 1356 w (the) 2370 1356 w (meanings) 2522 1356 w (of) 2935 1356 w (those) 3048 1356 w (parameters) 3289 1356 w (is) 3756 1356 w (the) 3853 1356 w (same) 4004 1356 w (as) 4238 1356 w (the) 4350 1356 w (more) 4501 1356 w (modern) 4735 1356 w 10 /Times-Bold f (\255gamma) 720 1476 w 10 /Times-Roman f (,) 1069 1476 w 10 /Times-Bold f (\255rgamma) 1119 1476 w 10 /Times-Roman f (,) 1512 1476 w 10 /Times-Bold f (\255ggamma) 1562 1476 w 10 /Times-Roman f (, and) 1961 1476 w 10 /Times-Bold f (\255bgamma) 2180 1476 w 10 /Times-Roman f (options described below.) 2610 1476 w 10 /Times-Bold f (OPTIONS) 720 1716 w (\255bt709tolinear) 970 1908 w 10 /Times-Roman f (Convert) 1575 1908 w (the) 1927 1908 w (image) 2079 1908 w (from) 2353 1908 w (ITU) 2577 1908 w (Recommendation) 2773 1908 w (BT.709) 3508 1908 w (luminance) 3841 1908 w (to) 4287 1908 w (radiance) 4395 1908 w (\(some\255) 4763 1908 w (times) 1220 2028 w (called) 1471 2028 w ("linear"\).) 1743 2028 w (I.e.) 2169 2028 w (convert) 2330 2028 w (from) 2663 2028 w (true) 2891 2028 w (PPM) 3080 2028 w (or) 3315 2028 w (PGM) 3432 2028 w (to) 3683 2028 w (a) 3795 2028 w (radiance\255linear) 3872 2028 w (variation) 4502 2028 w (that) 4890 2028 w (can be used with certain tools that need it.) 1220 2148 w (This option was new in Netpbm 10.32 \(February 2006\).) 970 2304 w 10 /Times-Bold f (\255lineartobt709) 970 2460 w 10 /Times-Roman f (Convert) 1575 2460 w (the) 1937 2460 w (image) 2099 2460 w (from) 2383 2460 w (radiance) 2617 2460 w (to) 2994 2460 w (ITU) 3112 2460 w (Recommendation) 3318 2460 w (BT.709) 4063 2460 w (luminance.) 4406 2460 w (I.e.) 4913 2460 w (convert to true PPM or PGM from a "linear" variation.) 1220 2580 w (This option was new in Netpbm 10.32 \(February 2006\).) 970 2736 w 10 /Times-Bold f (\255bt709tosrgb) 970 2892 w 10 /Times-Roman f (Convert) 1514 2892 w (the) 1863 2892 w (image) 2012 2892 w (from) 2283 2892 w (ITU) 2504 2892 w (Recommendation) 2697 2892 w (BT.709) 3429 2892 w (luminance) 3759 2892 w (to) 4203 2892 w (SRGB) 4309 2892 w (luminance.) 4599 2892 w (I.e.) 1220 3012 w (convert) 1386 3012 w (from) 1724 3012 w (true) 1957 3012 w (PPM) 2151 3012 w (or) 2391 3012 w (PGM) 2512 3012 w (to) 2767 3012 w (an) 2883 3012 w (SRGB\255based) 3015 3012 w (variation) 3575 3012 w (that) 3968 3012 w (is) 4156 3012 w (required) 4261 3012 w (by) 4631 3012 w (certain) 4769 3012 w (tools and display devices.) 1220 3132 w (This option was new in Netpbm 10.32 \(February 2006\).) 970 3288 w 10 /Times-Bold f (\255srgbtobt709) 970 3444 w 10 /Times-Roman f (Convert) 1514 3444 w (the) 1863 3444 w (image) 2012 3444 w (from) 2283 3444 w (SRGB) 2504 3444 w (luminance) 2793 3444 w (to) 3236 3444 w (ITU) 3341 3444 w (Recommendation) 3535 3444 w (BT.709) 4268 3444 w (luminance.) 4599 3444 w (I.e. convert to true PPM or PGM from an SRGB\255based variation.) 1220 3564 w (This option was new in Netpbm 10.32 \(February 2006\).) 970 3720 w 10 /Times-Bold f (\255bt709ramp) 970 3876 w 10 /Times-Roman f (Use) 1475 3876 w (the) 1664 3876 w (ITU\255R) 1820 3876 w (Recommendation) 2120 3876 w (BT.709) 2859 3876 w (gamma) 3196 3876 w (transfer) 3524 3876 w (function.) 3862 3876 w (Note) 4279 3876 w (that) 4507 3876 w (it) 4692 3876 w (is) 4783 3876 w (true) 4885 3876 w (BT.709) 1220 3996 w (only) 1559 3996 w (if) 1773 3996 w (you) 1870 3996 w (use) 2056 3996 w (the) 2225 3996 w (default) 2383 3996 w (gamma) 2696 3996 w (value) 3026 3996 w (\(i.e.) 3278 3996 w (don't) 3468 3996 w (specify) 3714 3996 w (any) 4037 3996 w (gamma) 4216 3996 w (parameters\).) 4545 3996 w (This transfer function is a power function modified with a linear ramp near black.) 1220 4116 w (If you specify none of the transfer functions the transfer function defaults to a simple power function.) 970 4272 w (This option was renamed in Netpbm 10.32 \(February 2006\).) 970 4428 w (Before that, its name is) 3428 4428 w 10 /Times-Bold f (\255cieramp) 4377 4428 w 10 /Times-Roman f (.) 4759 4428 w 10 /Times-Bold f (\255cieramp) 970 4584 w 10 /Times-Roman f (This is an obsolete synonym for) 1352 4584 w 10 /Times-Bold f (\255bt709ramp) 2657 4584 w 10 /Times-Roman f (.) 3162 4584 w (The) 970 4740 w (name) 1160 4740 w (of) 1411 4740 w (this) 1529 4740 w (option) 1709 4740 w (comes) 2000 4740 w (from) 2290 4740 w (a) 2519 4740 w (former) 2599 4740 w (belief) 2906 4740 w (that) 3169 4740 w (this) 3355 4740 w (was) 3536 4740 w (a) 3727 4740 w (standard) 3807 4740 w (of) 4181 4740 w (CIE) 4300 4740 w (\(International) 4497 4740 w (Commission On Illumination\), but it now \(August 2005\) looks like it never was.) 970 4860 w 10 /Times-Bold f (\255srgbramp) 970 5016 w 10 /Times-Roman f (Use) 1457 5016 w (the) 1644 5016 w (Internation) 1798 5016 w (Electrotechnical) 2268 5016 w (Commission) 2948 5016 w (\(IEC\)) 3488 5016 w (SRGB) 3748 5016 w (gamma) 4043 5016 w (transfer) 4370 5016 w (function) 4707 5016 w (\(as) 1220 5136 w (specified) 1373 5136 w (in) 1770 5136 w (the) 1885 5136 w (standard) 2044 5136 w (IEC) 2419 5136 w (61966\2552\2551\).) 2617 5136 w (Note) 3152 5136 w (that) 3382 5136 w (it) 3568 5136 w (is) 3660 5136 w (true) 3763 5136 w (SRGB) 3954 5136 w (only) 4252 5136 w (if) 4466 5136 w (you) 4563 5136 w (use) 4749 5136 w (the) 4918 5136 w (default) 1220 5256 w (gamma) 1526 5256 w (value) 1850 5256 w (\(i.e.) 2096 5256 w (don't) 2281 5256 w (specify) 2522 5256 w (any) 2840 5256 w (gamma) 3014 5256 w (parameters\).) 3338 5256 w (This) 3888 5256 w (transfer) 4096 5256 w (function) 4430 5256 w (is) 4793 5256 w (like) 4890 5256 w (the one selected by) 1220 5376 w 10 /Times-Bold f (\255bt709ramp) 2007 5376 w 10 /Times-Roman f (, but with different constants in it.) 2512 5376 w (Note) 970 5532 w (that) 1200 5532 w (SRGB) 1386 5532 w (is) 1684 5532 w (often) 1787 5532 w (spelled) 2028 5532 w ("sRGB".) 2347 5532 w (In) 2761 5532 w (this) 2881 5532 w (document,) 3063 5532 w (we) 3519 5532 w (use) 3672 5532 w (standard) 3842 5532 w (English) 4217 5532 w (typography,) 4560 5532 w (though, which doesn't allow for that kind of capitalization.) 970 5652 w (If) 970 5808 w (you) 1068 5808 w (specify) 1250 5808 w (neither) 1570 5808 w 10 /Times-Bold f (\255bt709ramp) 1879 5808 w 10 /Times-Roman f (nor) 2417 5808 w 10 /Times-Bold f (\255srgbramp) 2583 5808 w 10 /Times-Roman f (,) 3038 5808 w (the) 3096 5808 w (transfer) 3251 5808 w (function) 3588 5808 w (defaults) 3954 5808 w (to) 4303 5808 w (a) 4414 5808 w (simple) 4491 5808 w (power) 4791 5808 w (function.) 970 5928 w 10 /Times-Bold f (\255ungamma) 970 6084 w 10 /Times-Roman f (Apply) 1431 6084 w (the) 1713 6084 w (inverse) 1867 6084 w (of) 2187 6084 w (the) 2302 6084 w (specified) 2456 6084 w (transfer) 2848 6084 w (function) 3184 6084 w (\(i.e.) 3549 6084 w (go) 3736 6084 w (from) 3868 6084 w (gamma\255corrected) 4094 6084 w (lumi\255) 4823 6084 w (nance to radiance\).) 1220 6204 w (This) 970 6360 w (is) 1175 6360 w (valid) 1269 6360 w (only) 1496 6360 w (with) 1701 6360 w 10 /Times-Bold f (\255bt709ramp) 1907 6360 w 10 /Times-Roman f (\(aka) 2440 6360 w 10 /Times-Bold f (\255cieramp) 2639 6360 w 10 /Times-Roman f (\),) 3021 6360 w 10 /Times-Bold f (\255srgbramp) 3107 6360 w 10 /Times-Roman f (,) 3562 6360 w (and) 3615 6360 w (the) 3787 6360 w (default) 3937 6360 w (exponential) 4242 6360 w (transfer) 4736 6360 w (function.) 970 6480 w 10 /Times-Bold f (\255gamma=) 970 6636 w 10 /Times-Italic f (float) 1376 6636 w 10 /Times-Roman f (This specifies the gamma value to use in the transfer function.) 1560 6636 w (All of the transfer) 4092 6636 w (func\255) 4830 6636 w (tions involve an exponent, and the gamma value is that exponent.) 1220 6756 w (The) 970 6912 w (standards) 1155 6912 w (specify) 1562 6912 w (a) 1880 6912 w (particular) 1955 6912 w (gamma) 2368 6912 w (value.) 2693 6912 w (If) 2990 6912 w (you) 3087 6912 w (use) 3268 6912 w (anything) 3432 6912 w (else,) 3813 6912 w (you) 4024 6912 w (are) 4205 6912 w (varying) 4357 6912 w (from) 4693 6912 w (the) 4918 6912 w (standard.) 970 7032 w (The) 970 7188 w (default) 1156 7188 w (is) 1464 7188 w (the) 1562 7188 w (standard) 1715 7188 w (value.) 2084 7188 w (For) 2381 7188 w (the) 2551 7188 w (simple) 2704 7188 w (exponential) 3003 7188 w (transfer) 3501 7188 w (function) 3837 7188 w (\(which) 4202 7188 w (is) 4511 7188 w (not) 4610 7188 w (a) 4770 7188 w (stan\255) 4846 7188 w (dard\), the default is 2.2.) 970 7308 w cleartomark showpage saveobj restore %%EndPage: 2 2 %%Page: 3 3 /saveobj save def mark 3 pagesetup 10 /Times-Roman f (\255 3 \255) 2797 480 w (If) 970 840 w (you) 1073 840 w (specify) 1261 840 w (one) 1587 840 w (of) 1769 840 w (the) 1890 840 w (component\255specific) 2050 840 w (options) 2875 840 w (\() 3208 840 w 10 /Times-Bold f (\255rgamma) 3241 840 w 10 /Times-Roman f (,) 3634 840 w (etc.\),) 3697 840 w (that) 3934 840 w (overrides) 4122 840 w (the) 4531 840 w 10 /Times-Bold f (\255gamma) 4691 840 w 10 /Times-Roman f (value.) 970 960 w (With) 970 1116 w (the) 1210 1116 w 10 /Times-Bold f (\255bt709ramp) 1372 1116 w 10 /Times-Roman f (\(aka) 1917 1116 w 10 /Times-Bold f (\255cieramp) 2128 1116 w 10 /Times-Roman f (\),) 2510 1116 w 10 /Times-Bold f (\255srgbramp) 2608 1116 w 10 /Times-Roman f (,) 3063 1116 w (or) 3128 1116 w (the) 3251 1116 w (default) 3413 1116 w (exponentional) 3730 1116 w (transfer) 4337 1116 w (function,) 4682 1116 w (you can't actually use this option, but you specify the same thing with parameters.) 970 1236 w (This option was new in Netpbm 10.32 \(February 2006\).) 970 1392 w 10 /Times-Bold f (\255rgamma=) 970 1548 w 10 /Times-Italic f (float) 1420 1548 w 10 /Times-Bold f (\255ggamma=) 970 1704 w 10 /Times-Italic f (float) 1426 1704 w 10 /Times-Bold f (\255bgamma=) 970 1860 w 10 /Times-Italic f (float) 1432 1860 w 10 /Times-Roman f (These options are just like) 1616 1860 w 10 /Times-Bold f (\255gamma) 2690 1860 w 10 /Times-Roman f (, except they) 3039 1860 w (specify) 3572 1860 w (the) 3886 1860 w (value) 4034 1860 w (for) 4276 1860 w (a) 4418 1860 w (particular) 4488 1860 w (one) 4896 1860 w (of the color components.) 1220 1980 w (If) 970 2136 w (you) 1063 2136 w (don't) 1240 2136 w (specify) 1478 2136 w (this) 1793 2136 w (option) 1965 2136 w (for) 2248 2136 w (a) 2391 2136 w (particular) 2463 2136 w (color) 2873 2136 w (component,) 3106 2136 w (the) 3603 2136 w (default) 3753 2136 w (is) 4058 2136 w (the) 4153 2136 w 10 /Times-Bold f (\255gamma) 4303 2136 w 10 /Times-Roman f (value) 4680 2136 w (\(or) 4924 2136 w 10 /Times-Bold f (\255gamma) 970 2256 w 10 /Times-Roman f ('s default if you didn't specify that either\).) 1319 2256 w (With) 970 2412 w (the) 1210 2412 w 10 /Times-Bold f (\255bt709ramp) 1372 2412 w 10 /Times-Roman f (\(aka) 1917 2412 w 10 /Times-Bold f (\255cieramp) 2128 2412 w 10 /Times-Roman f (\),) 2510 2412 w 10 /Times-Bold f (\255srgbramp) 2608 2412 w 10 /Times-Roman f (,) 3063 2412 w (or) 3128 2412 w (the) 3251 2412 w (default) 3413 2412 w (exponentional) 3730 2412 w (transfer) 4337 2412 w (function,) 4682 2412 w (you can't actually use this option, but you specify the same thing with parameters.) 970 2532 w (This option was new in Netpbm 10.32 \(February 2006\).) 970 2688 w 10 /Times-Bold f (\255maxval=) 970 2844 w 10 /Times-Italic f (maxval) 1371 2844 w 10 /Times-Roman f (This) 1659 2844 w (is) 1867 2844 w (the) 1964 2844 w (maxval) 2116 2844 w (of) 2440 2844 w (the) 2553 2844 w (output) 2705 2844 w (image.) 2991 2844 w (By) 3315 2844 w (default,) 3462 2844 w (the) 3794 2844 w (maxval) 3946 2844 w (of) 4270 2844 w (the) 4383 2844 w (output) 4535 2844 w (is) 4821 2844 w (the) 4918 2844 w (same as that of the input.) 1220 2964 w (Because) 970 3120 w (the) 1330 3120 w (transformation) 1480 3120 w (is) 2096 3120 w (not) 2191 3120 w (linear,) 2348 3120 w (you) 2629 3120 w (need) 2808 3120 w (a) 3025 3120 w (greater) 3098 3120 w (maxval) 3403 3120 w (in) 3726 3120 w (the) 3833 3120 w (output) 3984 3120 w (in) 4269 3120 w (order) 4376 3120 w (not) 4615 3120 w (to) 4772 3120 w (lose) 4879 3120 w (any) 970 3240 w (information) 1149 3240 w (from) 1656 3240 w (the) 1885 3240 w (input.) 2041 3240 w (For) 2331 3240 w (example,) 2504 3240 w (if) 2901 3240 w (you) 2996 3240 w (convert) 3180 3240 w (to) 3513 3240 w (radiance\255linear) 3625 3240 w (sample) 4256 3240 w (values) 4573 3240 w (with) 4862 3240 w (with) 970 3360 w 10 /Courier f (\255ungamma) 1216 3360 w (\255bt709ramp) 1764 3360 w 10 /Times-Roman f (and) 2397 3360 w (default) 2574 3360 w (gamma) 2884 3360 w (value,) 3211 3360 w (and) 3485 3360 w (your) 3662 3360 w (maxval) 3878 3360 w (is) 4205 3360 w (255) 4305 3360 w (on) 4488 3360 w (both) 4622 3360 w (input) 4834 3360 w (and) 970 3480 w (output,) 1145 3480 w (3) 1457 3480 w (different) 1538 3480 w (input) 1911 3480 w (sample) 2147 3480 w (values) 2460 3480 w (all) 2745 3480 w (generate) 2875 3480 w (output) 3242 3480 w (sample) 3528 3480 w (value) 3841 3480 w (254.) 4087 3480 w (In) 4317 3480 w (order) 4430 3480 w (to) 4670 3480 w (have) 4778 3480 w (a) 4996 3480 w (different) 970 3600 w (output) 1341 3600 w (sample) 1625 3600 w (value) 1936 3600 w (for) 2180 3600 w (each) 2324 3600 w (input) 2534 3600 w (sample) 2768 3600 w (value,) 3080 3600 w (you) 3350 3600 w (would) 3529 3600 w (need) 3808 3600 w (an) 4025 3600 w (output) 4148 3600 w (maxval) 4433 3600 w (at) 4756 3600 w (least) 4857 3600 w (3 times the input maxval.) 970 3720 w (This) 970 3876 w (option) 1174 3876 w (was) 1456 3876 w (new) 1637 3876 w (in) 1829 3876 w (Netpbm) 1933 3876 w (10.32) 2282 3876 w (\(February) 2534 3876 w (2006\).) 2954 3876 w (Before) 3264 3876 w (that,) 3562 3876 w (you) 3764 3876 w (can) 3941 3876 w (achieve) 4106 3876 w (the) 4437 3876 w (same) 4586 3876 w (result) 4818 3876 w (by increasing the maxval of the input or decreasing the maxval of the output using) 970 3996 w 10 /Times-Bold f (pnmdepth) 4285 3996 w 10 /Times-Roman f (.) 4725 3996 w 10 /Times-Bold f (WHAT IS GAMMA?) 720 4236 w 10 /Times-Roman f (A) 720 4428 w (good) 952 4428 w (explanation) 1312 4428 w (of) 1938 4428 w (gamma) 2181 4428 w (is) 2635 4428 w (in) 2862 4428 w (Charles) 3100 4428 w (Poynton's) 3565 4428 w (Gamma) 4131 4428 w (FAQ) 4607 4428 w (at) 4968 4428 w (http://www.poynton.com/GammaFAQ.html and Color FAQ at http://www.poynton.com/ColorFAQ.html.) 720 4548 w (In) 720 4704 w (brief:) 833 4704 w (The) 1079 4704 w (simplest) 1264 4704 w (way) 1628 4704 w (to) 1824 4704 w (code) 1932 4704 w (an) 2150 4704 w (image) 2274 4704 w (is) 2548 4704 w (by) 2645 4704 w (using) 2775 4704 w (sample) 3022 4704 w (values) 3335 4704 w (that) 3620 4704 w (are) 3800 4704 w (directly) 3951 4704 w (proportional) 4286 4704 w (to) 4810 4704 w (the) 4918 4704 w (radiance) 720 4824 w (of) 1089 4824 w (the) 1204 4824 w (color) 1358 4824 w (components.) 1595 4824 w (Radiance) 2160 4824 w (is) 2563 4824 w (a) 2662 4824 w (physical) 2738 4824 w (quantification) 3103 4824 w (based) 3690 4824 w (on) 3949 4824 w (the) 4081 4824 w (amount) 4235 4824 w (of) 4567 4824 w (power) 4682 4824 w (in) 4962 4824 w (the) 720 4944 w (light;) 868 4944 w (it) 1106 4944 w (is) 1188 4944 w (easily) 1281 4944 w (measurable) 1540 4944 w (in) 2020 4944 w (a) 2124 4944 w (laboratory,) 2194 4944 w (but) 2656 4944 w (does) 2811 4944 w (not) 3021 4944 w (take) 3176 4944 w (into) 3369 4944 w (account) 3552 4944 w (what) 3889 4944 w (the) 4110 4944 w (light) 4259 4944 w (looks) 4470 4944 w (like) 4714 4944 w (to) 4891 4944 w (a) 4996 4944 w (person.) 720 5064 w (It) 1067 5064 w (wastes) 1159 5064 w (the) 1456 5064 w (sample) 1608 5064 w (space) 1921 5064 w (because) 2172 5064 w (the) 2517 5064 w (human) 2669 5064 w (eye) 2971 5064 w (can't) 3139 5064 w (discern) 3368 5064 w (differences) 3686 5064 w (between) 4158 5064 w (low\255radiance) 4520 5064 w (colors) 720 5184 w (as) 999 5184 w (well) 1117 5184 w (as) 1324 5184 w (it) 1442 5184 w (can) 1533 5184 w (between) 1706 5184 w (high\255radiance) 2073 5184 w (colors.) 2656 5184 w (So) 2985 5184 w (instead,) 3126 5184 w (we) 3469 5184 w (pass) 3620 5184 w (the) 3827 5184 w (radiance) 3985 5184 w (values) 4358 5184 w (through) 4649 5184 w (a) 4996 5184 w (transfer) 720 5304 w (function) 1062 5304 w (that) 1433 5304 w (makes) 1621 5304 w (it) 1914 5304 w (so) 2008 5304 w (that) 2135 5304 w (changing) 2323 5304 w (a) 2726 5304 w (sample) 2807 5304 w (value) 3127 5304 w (by) 3380 5304 w (1) 3517 5304 w (causes) 3604 5304 w (the) 3901 5304 w (same) 4060 5304 w (level) 4302 5304 w (of) 4533 5304 w (perceived) 4653 5304 w (color change anywhere in the sample range.) 720 5424 w (We store those resulting values in) 2523 5424 w (the) 3900 5424 w (image) 4048 5424 w (file.) 4318 5424 w (That) 4527 5424 w (transfer) 4736 5424 w (function is called the gamma transfer function and the transformation is called gamma correcting.) 720 5544 w (The gamma\255corrected value, proportional to subjective brightness, are known as the luminance of the pixel.) 720 5700 w (There) 720 5856 w (is) 994 5856 w (no) 1103 5856 w (precise) 1246 5856 w (objective) 1571 5856 w (way) 1980 5856 w (to) 2189 5856 w (measure) 2310 5856 w (luminance,) 2685 5856 w (since) 3169 5856 w (it's) 3417 5856 w (psychological.) 3588 5856 w (Also,) 4236 5856 w (perception) 4493 5856 w (of) 4957 5856 w (brightness) 720 5976 w (varies) 1161 5976 w (according) 1429 5976 w (to) 1852 5976 w (a) 1960 5976 w (variety) 2034 5976 w (of) 2341 5976 w (factors,) 2454 5976 w (including) 2780 5976 w (the) 3188 5976 w (surrounding) 3340 5976 w (in) 3853 5976 w (which) 3961 5976 w (an) 4235 5976 w (image) 4358 5976 w (is) 4631 5976 w (viewed.) 4727 5976 w (Therefore, there is not just one gamma transfer function.) 720 6096 w (Virtually) 720 6252 w (all) 1112 6252 w (image) 1243 6252 w (formats,) 1518 6252 w (either) 1879 6252 w (specified) 2137 6252 w (or) 2529 6252 w (de) 2644 6252 w (facto,) 2770 6252 w (use) 3026 6252 w (gamma\255corrected) 3191 6252 w (values) 3920 6252 w (for) 4207 6252 w (their) 4355 6252 w (sample) 4570 6252 w (val\255) 4885 6252 w (ues.) 720 6372 w (What's) 720 6528 w (really) 1036 6528 w (nice) 1291 6528 w (about) 1485 6528 w (gamma) 1736 6528 w (is) 2059 6528 w (that) 2155 6528 w (by) 2334 6528 w (coincidence,) 2463 6528 w (the) 2993 6528 w (inverse) 3144 6528 w (function) 3461 6528 w (that) 3823 6528 w (you) 4002 6528 w (have) 4181 6528 w (to) 4398 6528 w (do) 4505 6528 w (to) 4634 6528 w (convert) 4741 6528 w (the) 720 6648 w (gamma\255corrected) 874 6648 w (values) 1603 6648 w (back) 1890 6648 w (to) 2109 6648 w (radiance) 2218 6648 w (is) 2586 6648 w (done) 2684 6648 w (automatically) 2909 6648 w (by) 3484 6648 w (CRTs.) 3615 6648 w (You) 3930 6648 w (just) 4133 6648 w (apply) 4309 6648 w (a) 4562 6648 w (voltage) 4637 6648 w (to) 4962 6648 w (the) 720 6768 w (CRT's) 874 6768 w (electron) 1173 6768 w (gun) 1526 6768 w (that) 1708 6768 w (is) 1890 6768 w (proportional) 1989 6768 w (to) 2515 6768 w (the) 2625 6768 w (gamma\255corrected) 2780 6768 w (sample) 3510 6768 w (value,) 3826 6768 w (and) 4100 6768 w (the) 4277 6768 w (radiance) 4432 6768 w (of) 4802 6768 w (the) 4918 6768 w (light) 720 6888 w (that) 942 6888 w (comes) 1130 6888 w (out) 1423 6888 w (of) 1589 6888 w (the) 1710 6888 w (screen) 1870 6888 w (is) 2162 6888 w (close) 2267 6888 w (to) 2509 6888 w (the) 2624 6888 w (radiance) 2783 6888 w (value) 3157 6888 w (you) 3410 6888 w (had) 3597 6888 w (before) 3778 6888 w (you) 4069 6888 w (applied) 4256 6888 w (the) 4587 6888 w (gamma) 4746 6888 w (transfer function!) 720 7008 w (And) 720 7164 w (when) 927 7164 w (you) 1178 7164 w (consider) 1363 7164 w (that) 1736 7164 w (computer) 1921 7164 w (video) 2333 7164 w (devices) 2590 7164 w (usually) 2924 7164 w (want) 3248 7164 w (you) 3477 7164 w (to) 3662 7164 w (store) 3775 7164 w (in) 4004 7164 w (video) 4117 7164 w (memory) 4375 7164 w (a) 4744 7164 w (value) 4824 7164 w (proportional) 720 7284 w (to) 1240 7284 w (the signal voltage you want to go to the monitor, which the monitor turns into a proportional) 1344 7284 w cleartomark showpage saveobj restore %%EndPage: 3 3 %%Page: 4 4 /saveobj save def mark 4 pagesetup 10 /Times-Roman f (\255 4 \255) 2797 480 w (drive voltage on the electron gun, it is really convenient to work with gamma\255corrected sample values.) 720 840 w 10 /Times-Bold f (SEE ALSO) 720 1080 w (pnm) 720 1236 w (AUTHOR) 720 1476 w 10 /Times-Roman f (Copyright \(C\) 1991 by Bill Davidson and Jef Poskanzer.) 720 1632 w 10 /S1 f (________________________________________________________________________) 720 1752 w 10 /Times-Bold f (Table Of Contents) 720 1992 w 10 /LucidaSansUnicode22 f (\031) 720 2184 w 10 /Times-Roman f (SYNOPSIS) 970 2184 w 10 /LucidaSansUnicode22 f (\031) 720 2340 w 10 /Times-Roman f (DESCRIPTION) 970 2340 w 10 /LucidaSansUnicode22 f (\031) 720 2496 w 10 /Times-Roman f (PARAMETERS) 970 2496 w 10 /LucidaSansUnicode22 f (\031) 720 2652 w 10 /Times-Roman f (OPTIONS) 970 2652 w 10 /LucidaSansUnicode22 f (\031) 720 2808 w 10 /Times-Roman f (WHAT IS GAMMA?) 970 2808 w 10 /LucidaSansUnicode22 f (\031) 720 2964 w 10 /Times-Roman f (SEE ALSO) 970 2964 w 10 /LucidaSansUnicode22 f (\031) 720 3120 w 10 /Times-Roman f (AUTHOR) 970 3120 w cleartomark showpage saveobj restore %%EndPage: 4 4 %%Trailer done %%DocumentFonts: Times-Roman LucidaSansUnicode22 Times-Italic Times-Bold Courier S1 S %%Pages: 4