%!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 (Pamditherbw User) 2180 1230 w (Manual) 3179 1230 w 10 /Times-Bold f (pamditherbw) 720 1920 w 10 /Times-Roman f (Updated: 20 June 2004) 720 2076 w (Table Of Contents) 720 2196 w 10 /Times-Bold f (NAME) 720 2436 w 10 /Times-Roman f (pamditherbw \255 dither grayscale image to black and white) 720 2592 w 10 /Times-Bold f (SYNOPSIS) 720 2832 w (pamditherbw) 720 2988 w 10 /Times-Roman f ([) 1329 2988 w 10 /Times-Bold f (\255floyd) 1362 2988 w 10 /S f (\357) 1643 2988 w 10 /Times-Bold f (\255fs) 1723 2988 w 10 /S f (\357) 1859 2988 w 10 /Times-Bold f (\255threshold) 1939 2988 w 10 /S f (\357) 2409 2988 w 10 /Times-Bold f (\255hilbert) 2489 2988 w 10 /S f (\357) 2842 2988 w 10 /Times-Bold f (\255dither8) 2922 2988 w 10 /S f (\357) 3297 2988 w 10 /Times-Bold f (\255d8) 3377 2988 w 10 /S f (\357) 3547 2988 w 10 /Times-Bold f (\255cluster3) 3627 2988 w 10 /S f (\357) 4029 2988 w 10 /Times-Bold f (\255c3) 4109 2988 w 10 /S f (\357) 4267 2988 w 10 /Times-Bold f (\255cluster4) 4348 2988 w 10 /S f (\357) 4751 2988 w 10 /Times-Bold f (\255c4) 4832 2988 w 10 /S f (\357) 4991 2988 w 10 /Times-Bold f (\255cluster8) 720 3108 w 10 /Times-Roman f 10 /S f (\357) 1116 3108 w 10 /Times-Bold f (\255c8) 1190 3108 w 10 /Times-Roman f (] [) 1317 3108 w 10 /Times-Bold f (\255value) 1408 3108 w 10 /Times-Italic f (val) 1694 3108 w 10 /Times-Roman f (] [) 1816 3108 w 10 /Times-Bold f (\255clump) 1907 3108 w 10 /Times-Italic f (size) 2232 3108 w 10 /Times-Roman f (] [) 2382 3108 w 10 /Times-Italic f (pamfile) 2473 3108 w 10 /Times-Roman f (]) 2773 3108 w 10 /Times-Bold f (DESCRIPTION) 720 3348 w 10 /Times-Roman f (This program is part of Netpbm.) 720 3540 w 10 /Times-Bold f (pamditherbw) 720 3696 w 10 /Times-Roman f (dithers) 1338 3696 w (a) 1650 3696 w (grayscale) 1734 3696 w (image.) 2150 3696 w (Dithering) 2484 3696 w (means) 2907 3696 w (turning) 3202 3696 w (each) 3531 3696 w (shade) 3753 3696 w (of) 4020 3696 w (gray) 4143 3696 w (into) 4360 3696 w (a) 4556 3696 w (pattern) 4640 3696 w (of) 4957 3696 w (black and white pixels that, from a distance, look the same as the gray.) 720 3816 w (The) 720 3972 w (input) 902 3972 w (should) 1135 3972 w (be) 1429 3972 w (a) 1550 3972 w (PGM) 1621 3972 w (image) 1865 3972 w (or) 2136 3972 w (a) 2246 3972 w (PAM) 2317 3972 w (image) 2561 3972 w (of) 2832 3972 w (tuple) 2942 3972 w (type) 3169 3972 w (GRAYSCALE.) 3368 3972 w (However,) 4045 3972 w 10 /Times-Bold f (pamditherbw) 4462 3972 w 10 /Times-Roman f (doesn't) 720 4092 w (check,) 1042 4092 w (so) 1327 4092 w (if) 1444 4092 w (you) 1533 4092 w (feed) 1711 4092 w (it) 1909 4092 w (e.g.) 1992 4092 w (a) 2163 4092 w (PPM) 2234 4092 w (image,) 2462 4092 w (it) 2758 4092 w (will) 2841 4092 w (produce) 3024 4092 w (arbitrary) 3372 4092 w (results) 3742 4092 w (\(actually,) 4030 4092 w (it) 4431 4092 w (just) 4514 4092 w (takes) 4686 4092 w (the) 4918 4092 w (first channel of whatever you give it and treats it as if it represented gray levels\).) 720 4212 w (The) 720 4368 w (output) 904 4368 w (is) 1189 4368 w (a) 1285 4368 w (PAM) 1359 4368 w (with) 1606 4368 w (tuple) 1814 4368 w (type) 2044 4368 w (BLACKANDWHITE.) 2246 4368 w (You) 3202 4368 w (can) 3404 4368 w (turn) 3572 4368 w (this) 3763 4368 w (into) 3938 4368 w (a) 4124 4368 w (PBM) 4198 4368 w (\(if) 4440 4368 w (you) 4564 4368 w (need) 4744 4368 w (to) 4962 4368 w (use it with an older program doesn't understand PAM\) with) 720 4488 w 10 /Times-Bold f (pamtopnm) 3134 4488 w 10 /Times-Roman f (.) 3601 4488 w (To) 720 4644 w (do) 866 4644 w (the) 1001 4644 w (opposite) 1158 4644 w (of) 1532 4644 w (dithering,) 1650 4644 w (you) 2071 4644 w (can) 2256 4644 w (usually) 2429 4644 w (just) 2753 4644 w (scale) 2933 4644 w (the) 3167 4644 w (image) 3324 4644 w (down) 3604 4644 w (and) 3862 4644 w (then) 4042 4644 w (back) 4250 4644 w (up) 4474 4644 w (again) 4610 4644 w (with) 4862 4644 w 10 /Times-Bold f (pamscale) 720 4764 w 10 /Times-Roman f (,) 1114 4764 w (possibly) 1173 4764 w (smoothing) 1541 4764 w (or) 1998 4764 w (blurring) 2115 4764 w (the) 2471 4764 w (result) 2627 4764 w (with) 2882 4764 w 10 /Times-Bold f (pnmsmooth) 3093 4764 w 10 /Times-Roman f (or) 3632 4764 w 10 /Times-Bold f (pnmconvol) 3748 4764 w 10 /Times-Roman f (.) 4221 4764 w (Or) 4304 4764 w (use) 4442 4764 w (the) 4608 4764 w (special) 4763 4764 w (case program) 720 4884 w 10 /Times-Bold f (pbmtopgm) 1279 4884 w 10 /Times-Roman f (.) 1746 4884 w (To dither a color image \(to reduce the number of pixel colors\), use) 720 5040 w 10 /Times-Bold f (ppmdither) 3403 5040 w 10 /Times-Roman f (.) 3859 5040 w (Another) 720 5196 w (way) 1073 5196 w (to) 1265 5196 w (convert) 1369 5196 w (a) 1694 5196 w (grayscale) 1764 5196 w (image) 2166 5196 w (to) 2436 5196 w (a) 2540 5196 w (black) 2610 5196 w (and) 2852 5196 w (white) 3022 5196 w (image) 3270 5196 w (is) 3540 5196 w (thresholding.) 3633 5196 w (Thresholding) 4209 5196 w (is) 4768 5196 w (sim\255) 4862 5196 w (ply) 720 5316 w (replacing) 879 5316 w (each) 1281 5316 w (grayscale) 1494 5316 w (pixel) 1901 5316 w (with) 2132 5316 w (a) 2341 5316 w (black) 2416 5316 w (or) 2663 5316 w (white) 2777 5316 w (pixel) 3030 5316 w (depending) 3261 5316 w (on) 3708 5316 w (wether) 3838 5316 w (its) 4139 5316 w (brightness) 4264 5316 w (is) 4705 5316 w (above) 4802 5316 w (or) 720 5436 w (below) 831 5436 w (a) 1103 5436 w (threshold.) 1175 5436 w (That) 1625 5436 w (threshold) 1836 5436 w (might) 2236 5436 w (vary.) 2498 5436 w (Simple) 2753 5436 w (thresholding) 3066 5436 w (is) 3595 5436 w (a) 3691 5436 w (degenerate) 3764 5436 w (case) 4224 5436 w (of) 4424 5436 w (dithering,) 4536 5436 w (so) 4951 5436 w 10 /Times-Bold f (pamditherbw) 720 5556 w 10 /Times-Roman f (does) 1338 5556 w (very) 1560 5556 w (simple) 1776 5556 w (thresholding) 2082 5556 w (with) 2621 5556 w (its) 2838 5556 w 10 /Times-Bold f (\255threshold) 2972 5556 w 10 /Times-Roman f (option.) 3450 5556 w (But) 3795 5556 w 10 /Times-Bold f (pamthreshold) 3979 5556 w 10 /Times-Roman f (does) 4613 5556 w (more) 4835 5556 w (sophisticated thresholding.) 720 5676 w 10 /Times-Bold f (OPTIONS) 720 5916 w 10 /Times-Roman f (The default quantization method is boustrophedonic Floyd\255Steinberg error diffusion \() 720 6108 w 10 /Times-Bold f (\255floyd) 4141 6108 w 10 /Times-Roman f (or) 4416 6108 w 10 /Times-Bold f (\255fs) 4524 6108 w 10 /Times-Roman f (\).) 4629 6108 w (Also available are simple thresholding \() 720 6264 w 10 /Times-Bold f (\255threshold) 2315 6264 w 10 /Times-Roman f (\); Bayer's) 2754 6264 w (ordered) 3176 6264 w (dither) 3506 6264 w (\() 3765 6264 w 10 /Times-Bold f (\255dither8) 3798 6264 w 10 /Times-Roman f (\)) 4142 6264 w (with) 4201 6264 w (a) 4405 6264 w (16x16) 4475 6264 w (matrix;) 4751 6264 w (and three different sizes of 45\255degree clustered\255dot dither \() 720 6384 w 10 /Times-Bold f (\255cluster3) 3068 6384 w 10 /Times-Roman f (,) 3439 6384 w 10 /Times-Bold f (\255cluster4) 3489 6384 w 10 /Times-Roman f (,) 3860 6384 w 10 /Times-Bold f (\255cluster8) 3910 6384 w 10 /Times-Roman f (\).) 4281 6384 w (A space filling curve halftoning method using the Hilbert curve is also available \() 720 6540 w 10 /Times-Bold f (\255hilbert) 3979 6540 w 10 /Times-Roman f (\).) 4301 6540 w (Floyd\255Steinberg will almost always give the best looking results; however, looking) 720 6696 w (good) 4070 6696 w (is) 4296 6696 w (not) 4389 6696 w (always) 4543 6696 w (what) 4846 6696 w (you) 720 6816 w (want.) 896 6816 w (For) 1166 6816 w (instance,) 1331 6816 w (thresholding) 1709 6816 w (can) 2235 6816 w (be) 2399 6816 w (used) 2519 6816 w (in) 2728 6816 w (a) 2832 6816 w (pipeline) 2902 6816 w (with) 3250 6816 w (the) 3454 6816 w 10 /Times-Bold f (pnmconvol) 3602 6816 w 10 /Times-Roman f (tool,) 4101 6816 w (for) 4308 6816 w (tasks) 4450 6816 w (like) 4676 6816 w (edge) 4852 6816 w (and peak detection.) 720 6936 w (And clustered\255dot dithering gives a newspaper\255ish look, a useful special effect.) 1543 6936 w (The) 720 7092 w 10 /Times-Bold f (\255value) 901 7092 w 10 /Times-Roman f (option) 1188 7092 w (alters) 1470 7092 w (the) 1712 7092 w (thresholding) 1861 7092 w (value) 2388 7092 w (for) 2631 7092 w (Floyd\255Steinberg) 2774 7092 w (and) 3451 7092 w (simple) 3622 7092 w (thresholding.) 3916 7092 w (It) 4493 7092 w (should) 4581 7092 w (be) 4875 7092 w (a) 4996 7092 w (real number between 0 and 1.) 720 7212 w (Above 0.5 means darker images; below 0.5 means lighter.) 1950 7212 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 (The) 720 840 w (Hilbert) 902 840 w (curve) 1212 840 w (method) 1460 840 w (is) 1787 840 w (useful) 1881 840 w (for) 2152 840 w (processing) 2295 840 w (images) 2749 840 w (before) 3059 840 w (display) 3340 840 w (on) 3656 840 w (devices) 3783 840 w (that) 4109 840 w (do) 4286 840 w (not) 4413 840 w (render) 4569 840 w (indi\255) 4851 840 w (vidual) 720 960 w (pixels) 998 960 w (distinctly) 1265 960 w (\(like) 1665 960 w (laser) 1875 960 w (printers\).) 2090 960 w (This) 2505 960 w (dithering) 2710 960 w (method) 3098 960 w (can) 3425 960 w (give) 3590 960 w (better) 3789 960 w (results) 4043 960 w (than) 4331 960 w (the) 4530 960 w (dithering) 4679 960 w (usually) 720 1080 w (done) 1041 1080 w (by) 1267 1080 w (the) 1399 1080 w (laser) 1553 1080 w (printers) 1773 1080 w (themselves.) 2110 1080 w (The) 2637 1080 w 10 /Times-Bold f (\255clump) 2825 1080 w 10 /Times-Roman f (option) 3158 1080 w (alters) 3447 1080 w (the) 3696 1080 w (number) 3851 1080 w (of) 4189 1080 w (pixels) 4305 1080 w (in) 4577 1080 w (a) 4688 1080 w (clump.) 4765 1080 w (This) 720 1200 w (is) 926 1200 w (usually) 1021 1200 w (an) 1338 1200 w (integer) 1460 1200 w (between) 1765 1200 w (2) 2125 1200 w (and) 2203 1200 w (100) 2375 1200 w (\(default) 2553 1200 w (5\).) 2890 1200 w (Smaller) 3050 1200 w (clump) 3388 1200 w (sizes) 3665 1200 w (smear) 3886 1200 w (the) 4151 1200 w (image) 4300 1200 w (less) 4571 1200 w (and) 4748 1200 w (are) 4919 1200 w (less grainy, but seem to loose some grey scale linearity. Typically a PGM image will have to be) 720 1320 w (scaled) 4572 1320 w (to) 4847 1320 w (fit) 4951 1320 w (on) 720 1440 w (a) 855 1440 w (laser) 934 1440 w (printer) 1157 1440 w (page) 1458 1440 w (\(2400) 1681 1440 w (x) 1949 1440 w (3000) 2034 1440 w (pixels) 2269 1440 w (for) 2543 1440 w (an) 2694 1440 w (A4) 2823 1440 w (300) 2980 1440 w (dpi) 3165 1440 w (page\),) 3328 1440 w (and) 3609 1440 w (then) 3788 1440 w (dithered) 3995 1440 w (to) 4357 1440 w (a) 4470 1440 w (PBM) 4549 1440 w (image) 4796 1440 w (before being converted to a postscript file.) 720 1560 w (A printing pipeline might look something like:) 2458 1560 w (pamscale \255xysize 2400 3000 image.pgm ) 820 1740 w 10 /S f (\357) 2451 1740 w 10 /Times-Roman f (pamditherbw \255hilbert ) 2525 1740 w 10 /S f (\357) 3396 1740 w 10 /Times-Roman f (pamtopnm ) 3645 1740 w 10 /S f (\357) 4098 1740 w 10 /Times-Roman f (pnmtops \255scale 0.25 > image.ps) 4172 1740 w (All options can be abbreviated to their shortest unique prefix.) 720 1956 w 10 /Times-Bold f (REFERENCES) 720 2196 w 10 /Times-Roman f (The) 720 2388 w (only) 903 2388 w (reference) 1109 2388 w (you) 1506 2388 w (need) 1684 2388 w (for) 1900 2388 w (this) 2044 2388 w (stuff) 2217 2388 w (is) 2428 2388 w ("Digital) 2523 2388 w (Halftoning") 2870 2388 w (by) 3373 2388 w (Robert) 3502 2388 w (Ulichney,) 3803 2388 w (MIT) 4223 2388 w (Press,) 4435 2388 w (ISBN) 4700 2388 w (0\255) 4957 2388 w (262\25521009\2556.) 720 2508 w (The) 720 2664 w (Hilbert) 912 2664 w (curve) 1232 2664 w (space) 1490 2664 w (filling) 1748 2664 w (method) 2030 2664 w (is) 2367 2664 w (taken) 2471 2664 w (from) 2724 2664 w ("Digital) 2955 2664 w (Halftoning) 3311 2664 w (with) 3781 2664 w (Space) 3996 2664 w (Filling) 4272 2664 w (Curves") 4578 2664 w (by) 4940 2664 w (Luiz) 720 2784 w (Velho,) 944 2784 w (Computer) 1254 2784 w (Graphics) 1695 2784 w (Volume) 2096 2784 w (25,) 2459 2784 w (Number) 2625 2784 w (4,) 2993 2784 w (proceedings) 3108 2784 w (of) 3630 2784 w (SIGRAPH) 3753 2784 w ('91,) 4221 2784 w (page) 4419 2784 w (81.) 4647 2784 w (ISBN) 4812 2784 w (0\25589791\255436\2558) 720 2904 w 10 /Times-Bold f (SEE ALSO) 720 3144 w 10 /Times-Roman f (pamtopnm, pgmtopgm, pbmtopgm, pamthreshold, pbmreduce, pnmconvol, pamscale, pam, pnm,) 720 3300 w 10 /Times-Bold f (HISTORY) 720 3540 w (pamditherbw) 720 3732 w 10 /Times-Roman f (was) 1331 3732 w (new) 1519 3732 w (in) 1718 3732 w (Netpbm) 1829 3732 w (10.23) 2185 3732 w (\(July) 2444 3732 w (2004\),) 2678 3732 w (but) 2970 3732 w (is) 3132 3732 w (essentially) 3233 3732 w (the) 3689 3732 w (same) 3845 3732 w (program) 4084 3732 w (as) 4456 3732 w 10 /Times-Bold f (pgmtopbm) 4573 3732 w 10 /Times-Roman f (that) 720 3852 w (has) 901 3852 w (existed) 1065 3852 w (practically) 1379 3852 w (since) 1831 3852 w (the) 2067 3852 w (beginning.) 2220 3852 w 10 /Times-Bold f (pamditherbw) 2701 3852 w 10 /Times-Roman f (differs) 3310 3852 w (from) 3601 3852 w (its) 3825 3852 w (predecessor) 3950 3852 w (in) 4450 3852 w (that) 4558 3852 w (it) 4738 3852 w (prop\255) 4824 3852 w (erly) 720 3972 w (deals) 909 3972 w (with) 1148 3972 w (gamma) 1360 3972 w (adjustment) 1688 3972 w (and) 2161 3972 w (that) 2339 3972 w (it) 2523 3972 w (accepts) 2613 3972 w (PAM) 2940 3972 w (input) 3191 3972 w (in) 3431 3972 w (addition) 3543 3972 w (to) 3905 3972 w (PGM) 4017 3972 w (and) 4269 3972 w (PBM) 4448 3972 w (and) 4695 3972 w (pro\255) 4874 3972 w (duces PAM output.) 720 4092 w 10 /Times-Bold f (pamditherbw) 720 4248 w 10 /Times-Roman f (obsoletes) 1323 4248 w 10 /Times-Bold f (pgmtopbm) 1720 4248 w 10 /Times-Roman f (.) 2187 4248 w 10 /Times-Bold f (AUTHOR) 720 4488 w 10 /Times-Roman f (Copyright \(C\) 1989 by Jef Poskanzer.) 720 4644 w 10 /S1 f (________________________________________________________________________) 720 4764 w 10 /Times-Bold f (Table Of Contents) 720 5004 w 10 /LucidaSansUnicode22 f (\031) 720 5196 w 10 /Times-Roman f (SYNOPSIS) 970 5196 w 10 /LucidaSansUnicode22 f (\031) 720 5352 w 10 /Times-Roman f (DESCRIPTION) 970 5352 w 10 /LucidaSansUnicode22 f (\031) 720 5508 w 10 /Times-Roman f (OPTIONS) 970 5508 w 10 /LucidaSansUnicode22 f (\031) 720 5664 w 10 /Times-Roman f (REFERENCES) 970 5664 w 10 /LucidaSansUnicode22 f (\031) 720 5820 w 10 /Times-Roman f (SEE ALSO) 970 5820 w 10 /LucidaSansUnicode22 f (\031) 720 5976 w 10 /Times-Roman f (AUTHOR) 970 5976 w cleartomark showpage saveobj restore %%EndPage: 2 2 %%Trailer done %%DocumentFonts: Times-Roman LucidaSansUnicode22 Times-Italic Times-Bold S1 S %%Pages: 2