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/#copies 1 store
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/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
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/CO /Courier def
/CI /Courier-Oblique def
/CB /Courier-Bold def
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/PI /Palatino-Italic def
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/KI /Bookman-LightItalic def
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/NI /NewCenturySchlbk-Italic def
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/NX /NewCenturySchlbk-BoldItalic def
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%
% A few arrays used to adjust reference points and character widths in some
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%
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%	/radicalex	[-50 -75 500 0]
%
% Move braceleftbt a bit - default PostScript character is off a bit.
%

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	/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]
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/S1defs [
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	/endash			[7 90 650 0]
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%
% Tries to round clipping path dimensions, as stored in array pagebbox, so they
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%

/roundpagebbox {
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%%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.
%

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/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 {
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} if

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setup
%%EndSetup
%%Page: 1 1
/saveobj save def
mark
1 pagesetup
12 /Times-Bold f
(Pnmpsnr) 2293 1230 w
(User) 2797 1230 w
(Manual) 3066 1230 w
10 /Times-Bold f
(pnmpsnr) 720 1920 w
10 /Times-Roman f
(Updated: 04 March 2001) 720 2076 w
(Table Of Contents) 720 2196 w
10 /Times-Bold f
(NAME) 720 2436 w
10 /Times-Roman f
(pnmpsnr \255 compute the difference between two images \(the PSNR\)) 720 2592 w
10 /Times-Bold f
(SYNOPSIS) 720 2832 w
(pnmpsnr) 720 2988 w
10 /Times-Roman f
([) 1135 2988 w
10 /Times-Italic f
(pnmfile1) 1168 2988 w
10 /Times-Roman f
(] [) 1518 2988 w
10 /Times-Italic f
(pnmfile2) 1609 2988 w
10 /Times-Roman f
(]) 1959 2988 w
10 /Times-Bold f
(DESCRIPTION) 720 3228 w
10 /Times-Roman f
(This program is part of Netpbm.) 720 3420 w
10 /Times-Bold f
(pnmpsnr) 720 3576 w
10 /Times-Roman f
(reads) 1138 3576 w
(two) 1376 3576 w
(PBM,) 1554 3576 w
(PGM,) 1819 3576 w
(or) 2089 3576 w
(PPM) 2200 3576 w
(files,) 2429 3576 w
(or) 2654 3576 w
(PAM) 2765 3576 w
(equivalents,) 3010 3576 w
(as) 3518 3576 w
(input) 3629 3576 w
(and) 3863 3576 w
(prints) 4035 3576 w
(the) 4291 3576 w
(peak) 4441 3576 w
(signal\255to\255) 4657 3576 w
(noise) 720 3696 w
(ratio) 959 3696 w
(\(PSNR\)) 1170 3696 w
(difference) 1515 3696 w
(between) 1946 3696 w
(the) 2305 3696 w
(two) 2454 3696 w
(images.) 2631 3696 w
(This) 2991 3696 w
(metric) 3196 3696 w
(is) 3478 3696 w
(typically) 3572 3696 w
(used) 3949 3696 w
(in) 4159 3696 w
(image) 4264 3696 w
(compression) 4535 3696 w
(papers to rate the distortion between original and decoded image.) 720 3816 w
(If) 720 3972 w
(the) 816 3972 w
(inputs) 968 3972 w
(are) 1243 3972 w
(PBM) 1394 3972 w
(or) 1636 3972 w
(PGM,) 1749 3972 w
10 /Times-Bold f
(pnmpsnr) 2021 3972 w
10 /Times-Roman f
(prints) 2441 3972 w
(the) 2699 3972 w
(PSNR) 2851 3972 w
(of) 3133 3972 w
(the) 3247 3972 w
(luminance) 3400 3972 w
(only.) 3847 3972 w
(Otherwise,) 4106 3972 w
(it) 4572 3972 w
(prints) 4659 3972 w
(the) 4918 3972 w
(separate PSNRs of the luminance, and chrominance \(Cb and Cr\) components of the colors.) 720 4092 w
(The) 720 4248 w
(PSNR) 908 4248 w
(of) 1192 4248 w
(a) 1308 4248 w
(given) 1385 4248 w
(component) 1640 4248 w
(is) 2117 4248 w
(the) 2217 4248 w
(ratio) 2372 4248 w
(of) 2588 4248 w
(the) 2704 4248 w
(mean) 2859 4248 w
(square) 3108 4248 w
(difference) 3401 4248 w
(of) 3837 4248 w
(the) 3953 4248 w
(component) 4108 4248 w
(for) 4585 4248 w
(the) 4734 4248 w
(two) 4890 4248 w
(images) 720 4368 w
(to) 1029 4368 w
(the) 1133 4368 w
(maximum) 1281 4368 w
(mean) 1713 4368 w
(square) 1955 4368 w
(difference) 2241 4368 w
(that) 2670 4368 w
(can) 2846 4368 w
(exist) 3010 4368 w
(between) 3225 4368 w
(any) 3583 4368 w
(two) 3753 4368 w
(images.) 3929 4368 w
(It) 4288 4368 w
(is) 4375 4368 w
(expressed) 4468 4368 w
(as) 4887 4368 w
(a) 4996 4368 w
(decibel value.) 720 4488 w
(The) 720 4644 w
(mean) 901 4644 w
(square) 1143 4644 w
(difference) 1429 4644 w
(of) 1858 4644 w
(a) 1967 4644 w
(component) 2037 4644 w
(for) 2507 4644 w
(two) 2649 4644 w
(images) 2825 4644 w
(is) 3134 4644 w
(the) 3228 4644 w
(mean) 3377 4644 w
(square) 3620 4644 w
(difference) 3907 4644 w
(of) 4337 4644 w
(the) 4447 4644 w
(component) 4596 4644 w
(value,) 720 4764 w
(comparing) 987 4764 w
(each) 1440 4764 w
(pixel) 1648 4764 w
(with) 1874 4764 w
(the) 2078 4764 w
(pixel) 2226 4764 w
(in) 2452 4764 w
(the) 2556 4764 w
(same) 2704 4764 w
(position) 2935 4764 w
(of) 3284 4764 w
(the) 3393 4764 w
(other) 3541 4764 w
(image.) 3772 4764 w
(For) 4092 4764 w
(the) 4257 4764 w
(purposes) 4405 4764 w
(of) 4786 4764 w
(this) 4895 4764 w
(computation, components are normalized to the scale [0..1].) 720 4884 w
(The maximum mean square difference is identically 1.) 720 5040 w
(So) 720 5196 w
(the) 856 5196 w
(higher) 1008 5196 w
(the) 1293 5196 w
(PSNR,) 1445 5196 w
(the) 1751 5196 w
(closer) 1904 5196 w
(the) 2173 5196 w
(images) 2326 5196 w
(are.) 2640 5196 w
(A) 2842 5196 w
(luminance) 2945 5196 w
(PSNR) 3392 5196 w
(of) 3674 5196 w
(20) 3788 5196 w
(means) 3919 5196 w
(the) 4205 5196 w
(mean) 4358 5196 w
(square) 4605 5196 w
(dif\255) 4896 5196 w
(ference of the luminances of the pixels is 100 times less than the maximum possible difference, i.e. 0.01.) 720 5316 w
10 /Times-Bold f
(SEE ALSO) 720 5556 w
(pnm) 720 5712 w
10 /S1 f
(________________________________________________________________________) 720 5832 w
10 /Times-Bold f
(Table Of Contents) 720 6072 w
10 /LucidaSansUnicode22 f
(\031) 720 6264 w
10 /Times-Roman f
(NAME) 970 6264 w
10 /LucidaSansUnicode22 f
(\031) 720 6420 w
10 /Times-Roman f
(SYNOPSIS) 970 6420 w
10 /LucidaSansUnicode22 f
(\031) 720 6576 w
10 /Times-Roman f
(DESCRIPTION) 970 6576 w
10 /LucidaSansUnicode22 f
(\031) 720 6732 w
10 /Times-Roman f
(SEE ALSO) 970 6732 w
cleartomark
showpage
saveobj restore
%%EndPage: 1 1
%%Trailer
done
%%DocumentFonts: Times-Roman LucidaSansUnicode22 Times-Italic Times-Bold S1
%%Pages: 1