C Library Functions libpng(3)
NAME
libpng - Portable Network Graphics (PNG) Reference Library
SYNOPSIS
#include
cc [ flag ...] -I/usr/sfw/include file [ library ... ] -
L/usr/sfw/lib -R/usr/sfw/lib -lpng
pnguint32 pngaccessversionnumber (void);
int pngchecksig (pngbytep sig, int num);
void pngchunkerror (pngstructp pngptr, pngconstcharp
error);
void pngchunkwarning (pngstructp pngptr, pngconstcharp
message);
void pngconvertfromstructtm (pngtimep ptime, struct tm
FAR * ttime);
void pngconvertfromtimet (pngtimep ptime, timet
ttime);
pngcharp pngconverttorfc1124 (pngstructp pngptr,
pngtimep ptime);
pnginfop pngcreateinfostruct (pngstructp pngptr);
pngstructp pngcreatereadstruct (pngconstcharp
userpngver, pngvoidp errorptr, pngerrorptr errorfn,
pngerrorptr warnfn);
pngstructp pngcreatereadstruct2(pngconstcharp
userpngver, pngvoidp errorptr, pngerrorptr errorfn,
pngerrorptr warnfn, pngvoidp memptr, pngmallocptr
mallocfn, pngfreeptr freefn);
pngstructp pngcreatewritestruct (pngconstcharp
userpngver, pngvoidp errorptr, pngerrorptr errorfn,
pngerrorptr warnfn);
pngstructp pngcreatewritestruct2(pngconstcharp
userpngver, pngvoidp errorptr, pngerrorptr errorfn,
pngerrorptr warnfn, pngvoidp memptr, pngmallocptr
mallocfn, pngfreeptr freefn);
int pngdebug(int level, pngconstcharp message);
int pngdebug1(int level, pngconstcharp message, p1);
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C Library Functions libpng(3)
int pngdebug2(int level, pngconstcharp message, p1, p2);
void pngdestroyinfostruct (pngstructp pngptr,
pnginfopp infoptrptr);
void pngdestroyreadstruct (pngstructpp pngptrptr,
pnginfopp infoptrptr, pnginfopp endinfoptrptr);
void pngdestroywritestruct (pngstructpp pngptrptr,
pnginfopp infoptrptr);
void pngerror (pngstructp pngptr, pngconstcharp error);
void pngfree (pngstructp pngptr, pngvoidp ptr);
void pngfreechunklist (pngstructp pngptr);
void pngfreedefault(pngstructp pngptr, pngvoidp ptr);
void pngfreedata (pngstructp pngptr, pnginfop infoptr,
int num);
pngbyte pnggetbitdepth (pngstructp pngptr, pnginfop
infoptr);
pnguint32 pnggetbKGD (pngstructp pngptr, pnginfop
infoptr, pngcolor16p *background);
pngbyte pnggetchannels (pngstructp pngptr, pnginfop
infoptr);
pnguint32 pnggetcHRM (pngstructp pngptr, pnginfop
infoptr, double *whitex, double *whitey, double *redx,
double *redy, double *greenx, double *greeny, double
*bluex, double *bluey);
pnguint32 pnggetcHRMfixed (pngstructp pngptr,
pnginfop infoptr, pnguint32 *whitex, pnguint32
*whitey, pnguint32 *redx, pnguint32 *redy,
pnguint32 *greenx, pnguint32 *greeny, pnguint32
*bluex, pnguint32 *bluey);
pngbyte pnggetcolortype (pngstructp pngptr, pnginfop
infoptr);
pngbyte pnggetcompressiontype (pngstructp pngptr,
pnginfop infoptr);
pngbyte pnggetcopyright (pngstructp pngptr);
pngvoidp pnggeterrorptr (pngstructp pngptr);
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C Library Functions libpng(3)
pngbyte pnggetfiltertype (pngstructp pngptr, pnginfop
infoptr);
pnguint32 pnggetgAMA (pngstructp pngptr, pnginfop
infoptr, double *filegamma);
pnguint32 pnggetgAMAfixed (pngstructp pngptr,
pnginfop infoptr, pnguint32 *intfilegamma);
pngbyte pnggetheaderver (pngstructp pngptr);
pngbyte pnggetheaderversion (pngstructp pngptr);
pnguint32 pnggethIST (pngstructp pngptr, pnginfop
infoptr, pnguint16p *hist);
pnguint32 pnggetiCP (pngstructp pngptr, pnginfop
infoptr, pngcharpp name, int *compressiontype, pngcharpp
profile, pnguint32 *proflen);
pnguint32 pnggetIHDR (pngstructp pngptr, pnginfop
infoptr, pnguint32 *width, pnguint32 *height, int
*bitdepth, int *colortype, int *interlacetype, int
*compressiontype, int *filtertype);
pnguint32 pnggetimageheight (pngstructp pngptr,
pnginfop infoptr);
pnguint32 pnggetimagewidth (pngstructp pngptr,
pnginfop infoptr);
pngbyte pnggetinterlacetype (pngstructp pngptr,
pnginfop infoptr);
pngvoidp pnggetioptr (pngstructp pngptr);
pngbyte pnggetlibpngver (pngstructp pngptr);
pngvoidp pnggetmemptr(pngstructp pngptr);
pnguint32 pnggetoFs (pngstructp pngptr, pnginfop
infoptr, pnguint32 *offsetx, pnguint32 *offsety, int
*unittype);
pnguint32 pnggetpCAL (pngstructp pngptr, pnginfop
infoptr, pngcharp *purpose, pngint32 *X0, pngint32
*X1, int *type, int *nparams, pngcharp *units, pngcharpp
*params);
pnguint32 pnggetpHYs (pngstructp pngptr, pnginfop
infoptr, pnguint32 *resx, pnguint32 *resy, int
*unittype);
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C Library Functions libpng(3)
float pnggetpixelaspectratio (pngstructp pngptr,
pnginfop infoptr);
pnguint32 pnggetpixelspermeter (pngstructp pngptr,
pnginfop infoptr);
pngvoidp pnggetprogressiveptr (pngstructp pngptr);
pnguint32 pnggetPLTE (pngstructp pngptr, pnginfop
infoptr, pngcolorp *palette, int *numpalette);
pngbyte pnggetrgbtograystatus (pngstructp pngptr)
pnguint32 pnggetrowbytes (pngstructp pngptr, pnginfop
infoptr);
pngbytepp pnggetrows (pngstructp pngptr, pnginfop
infoptr);
pnguint32 pnggetsBIT (pngstructp pngptr, pnginfop
infoptr, pngcolor8p *sigbit);
pngbytep pnggetsignature (pngstructp pngptr, pnginfop
infoptr);
pnguint32 pnggetsPLT (pngstructp pngptr, pnginfop
infoptr, pngspalettep *spltptr);
pnguint32 pnggetsRGB (pngstructp pngptr, pnginfop
infoptr, int *intent);
pnguint32 pnggettext (pngstructp pngptr, pnginfop
infoptr, pngtextp *textptr, int *numtext);
pnguint32 pnggettIME (pngstructp pngptr, pnginfop
infoptr, pngtimep *modtime);
pnguint32 pnggettRNS (pngstructp pngptr, pnginfop
infoptr, pngbytep *trans, int *numtrans, pngcolor16p
*transvalues);
pnguint32 pnggetunknownchunks (pngstructp pngptr,
pnginfop infoptr, pngunknownchunkpp unknowns);
pngvoidp pnggetuserchunkptr (pngstructp pngptr);
pngvoidp pnggetusertransformptr (pngstructp pngptr);
pnguint32 pnggetvalid (pngstructp pngptr, pnginfop
infoptr, pnguint32 flag);
pngint32 pnggetxoffsetmicrons (pngstructp pngptr,
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C Library Functions libpng(3)
pnginfop infoptr);
pngint32 pnggetxoffsetpixels (pngstructp pngptr,
pnginfop infoptr);
pnguint32 pnggetxpixelspermeter (pngstructp pngptr,
pnginfop infoptr);
pngint32 pnggetyoffsetmicrons (pngstructp pngptr,
pnginfop infoptr);
pngint32 pnggetyoffsetpixels (pngstructp pngptr,
pnginfop infoptr);
pnguint32 pnggetypixelspermeter (pngstructp pngptr,
pnginfop infoptr);
pnguint32 pnggetcompressionbuffersize (pngstructp
pngptr);
void pnginfoinit (pnginfop infoptr);
void pnginitio (pngstructp pngptr, FILE *fp);
pngvoidp pngmalloc (pngstructp pngptr, pnguint32
size);
pngvoidp pngmallocdefault(pngstructp pngptr,
pnguint32 size);
voidp pngmemcpy (pngvoidp s1, pngvoidp s2, pngsizet
size);
pngvoidp pngmemcpycheck (pngstructp pngptr, pngvoidp
s1, pngvoidp s2, pnguint32 size);
voidp pngmemset (pngvoidp s1, int value, pngsizet size);
pngvoidp pngmemsetcheck (pngstructp pngptr, pngvoidp
s1, int value, pnguint32 size);
void pngpermitemptyplte (pngstructp pngptr, int
emptypltepermitted);
void pngprocessdata (pngstructp pngptr, pnginfop
infoptr, pngbytep buffer, pngsizet buffersize);
void pngprogressivecombinerow (pngstructp pngptr,
pngbytep oldrow, pngbytep newrow);
void pngreaddestroy (pngstructp pngptr, pnginfop
infoptr, pnginfop endinfoptr);
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C Library Functions libpng(3)
void pngreadend (pngstructp pngptr, pnginfop infoptr);
void pngreadimage (pngstructp pngptr, pngbytepp image);
DEPRECATED: void pngreadinit (pngstructp pngptr);
DEPRECATED: void pngreadinit2 (pngstructp pngptr,
pngconstcharp userpngver, pngsizet pngstructsize,
pngsizet pnginfosize);
void pngreadinfo (pngstructp pngptr, pnginfop
infoptr);
void pngreadpng (pngstructp pngptr, pnginfop infoptr,
int transforms, pngvoidp params);
void pngreadrow (pngstructp pngptr, pngbytep row,
pngbytep displayrow);
void pngreadrows (pngstructp pngptr, pngbytepp row,
pngbytepp displayrow, pnguint32 numrows);
void pngreadupdateinfo (pngstructp pngptr, pnginfop
infoptr);
void pngsetbackground (pngstructp pngptr, pngcolor16p
backgroundcolor, int backgroundgammacode, int
needexpand, double backgroundgamma);
void pngsetbgr (pngstructp pngptr);
void pngsetbKGD (pngstructp pngptr, pnginfop infoptr,
pngcolor16p background);
void pngsetcHRM (pngstructp pngptr, pnginfop infoptr,
double whitex, double whitey, double redx, double redy,
double greenx, double greeny, double bluex, double
bluey);
void pngsetcHRMfixed (pngstructp pngptr, pnginfop
infoptr, pnguint32 whitex, pnguint32 whitey,
pnguint32 redx, pnguint32 redy, pnguint32 greenx,
pnguint32 greeny, pnguint32 bluex, pnguint32
bluey);
void pngsetcompressionlevel (pngstructp pngptr, int
level);
void pngsetcompressionmemlevel (pngstructp pngptr, int
memlevel);
void pngsetcompressionmethod (pngstructp pngptr, int
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C Library Functions libpng(3)
method);
void pngsetcompressionstrategy (pngstructp pngptr, int
strategy);
void pngsetcompressionwindowbits (pngstructp pngptr,
int windowbits);
void pngsetcrcaction (pngstructp pngptr, int
critaction, int ancilaction);
void pngsetdither (pngstructp pngptr, pngcolorp
palette, int numpalette, int maximumcolors, pnguint16p
histogram, int fulldither);
void pngseterrorfn (pngstructp pngptr, pngvoidp
errorptr, pngerrorptr errorfn, pngerrorptr
warningfn);
void pngsetexpand (pngstructp pngptr);
void pngsetfiller (pngstructp pngptr, pnguint32
filler, int flags);
void pngsetfilter (pngstructp pngptr, int method, int
filters);
void pngsetfilterheuristics (pngstructp pngptr, int
heuristicmethod, int numweights, pngdoublep
filterweights, pngdoublep filtercosts);
void pngsetflush (pngstructp pngptr, int nrows);
void pngsetgamma (pngstructp pngptr, double
screengamma, double defaultfilegamma);
void pngsetgAMA (pngstructp pngptr, pnginfop infoptr,
double filegamma);
void pngsetgAMAfixed (pngstructp pngptr, pnginfop
infoptr, pnguint32 filegamma);
void pngsetgray124to8(pngstructp pngptr);
void pngsetgraytorgb (pngstructp pngptr);
void pngsethIST (pngstructp pngptr, pnginfop infoptr,
pnguint16p hist);
void pngsetiCP (pngstructp pngptr, pnginfop infoptr,
pngcharp name, int compressiontype, pngcharp profile,
pnguint32 proflen);
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C Library Functions libpng(3)
int pngsetinterlacehandling (pngstructp pngptr);
void pngsetinvalid (pngstructp pngptr, pnginfop
infoptr, int mask);
void pngsetinvertalpha (pngstructp pngptr);
void pngsetinvertmono (pngstructp pngptr);
void pngsetIHDR (pngstructp pngptr, pnginfop infoptr,
pnguint32 width, pnguint32 height, int bitdepth, int
colortype, int interlacetype, int compressiontype, int
filtertype);
void pngsetkeepunknownchunks (pngstructp pngptr, int
keep, pngbytep chunklist, int numchunks);
void pngsetmemfn(pngstructp pngptr, pngvoidp memptr,
pngmallocptr mallocfn, pngfreeptr freefn);
void pngsetoFs (pngstructp pngptr, pnginfop infoptr,
pnguint32 offsetx, pnguint32 offsety, int unittype);
void pngsetpacking (pngstructp pngptr);
void pngsetpackswap (pngstructp pngptr);
void pngsetpalettetorgb(pngstructp pngptr);
void pngsetpCAL (pngstructp pngptr, pnginfop infoptr,
pngcharp purpose, pngint32 X0, pngint32 X1, int type,
int nparams, pngcharp units, pngcharpp params);
void pngsetpHYs (pngstructp pngptr, pnginfop infoptr,
pnguint32 resx, pnguint32 resy, int unittype);
void pngsetprogressivereadfn (pngstructp pngptr,
pngvoidp progressiveptr, pngprogressiveinfoptr infofn,
pngprogressiverowptr rowfn, pngprogressiveendptr
endfn);
void pngsetPLTE (pngstructp pngptr, pnginfop infoptr,
pngcolorp palette, int numpalette);
void pngsetreadfn (pngstructp pngptr, pngvoidp ioptr,
pngrwptr readdatafn);
void pngsetreadstatusfn (pngstructp pngptr,
pngreadstatusptr readrowfn);
void pngsetreadusertransformfn (pngstructp pngptr,
pngusertransformptr readusertransformfn);
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C Library Functions libpng(3)
void pngsetrgbtogray (pngstructp pngptr, int
erroraction, double red, double green);
void pngsetrgbtograyfixed (pngstructp pngptr, int
erroraction pngfixedpoint red, pngfixedpoint green);
void pngsetrows (pngstructp pngptr, pnginfop infoptr,
pngbytepp rowpointers);
void pngsetsBIT (pngstructp pngptr, pnginfop infoptr,
pngcolor8p sigbit);
void pngsetsCAL (pngstructp pngptr, pnginfop infoptr,
pngcharp unit, double width, double height);
void pngsetshift (pngstructp pngptr, pngcolor8p
truebits);
void pngsetsigbytes (pngstructp pngptr, int numbytes);
void pngsetsPLT (pngstructp pngptr, pnginfop infoptr,
pngspalettep spltptr, int numspalettes);
void pngsetsRGB (pngstructp pngptr, pnginfop infoptr,
int intent);
void pngsetsRGBgAMAandcHRM (pngstructp pngptr,
pnginfop infoptr, int intent);
void pngsetstrip16 (pngstructp pngptr);
void pngsetstripalpha (pngstructp pngptr);
void pngsetswap (pngstructp pngptr);
void pngsetswapalpha (pngstructp pngptr);
void pngsettext (pngstructp pngptr, pnginfop infoptr,
pngtextp textptr, int numtext);
void pngsettIME (pngstructp pngptr, pnginfop infoptr,
pngtimep modtime);
void pngsettRNS (pngstructp pngptr, pnginfop infoptr,
pngbytep trans, int numtrans, pngcolor16p transvalues);
void pngsettRNStoalpha(pngstructp pngptr);
pnguint32 pngsetunknownchunks (pngstructp pngptr,
pnginfop infoptr, pngunknownchunkp unknowns, int num,
int location);
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C Library Functions libpng(3)
void pngsetunknownchunklocation(pngstructp pngptr,
pnginfop infoptr, int chunk, int location);
void pngsetreaduserchunkfn (pngstructp pngptr,
pngvoidp userchunkptr, pnguserchunkptr
readuserchunkfn);
void pngsetusertransforminfo (pngstructp pngptr,
pngvoidp usertransformptr, int usertransformdepth, int
usertransformchannels);
void pngsetwritefn (pngstructp pngptr, pngvoidp
ioptr, pngrwptr writedatafn, pngflushptr
outputflushfn);
void pngsetwritestatusfn (pngstructp pngptr,
pngwritestatusptr writerowfn);
void pngsetwriteusertransformfn (pngstructp pngptr,
pngusertransformptr writeusertransformfn);
void pngsetcompressionbuffersize(pngstructp pngptr,
pnguint32 size);
int pngsigcmp (pngbytep sig, pngsizet start, pngsizet
numtocheck);
void pngstartreadimage (pngstructp pngptr);
void pngwarning (pngstructp pngptr, pngconstcharp mes-
sage);
void pngwritechunk (pngstructp pngptr, pngbytep
chunkname, pngbytep data, pngsizet length);
void pngwritechunkdata (pngstructp pngptr, pngbytep
data, pngsizet length);
void pngwritechunkend (pngstructp pngptr);
void pngwritechunkstart (pngstructp pngptr, pngbytep
chunkname, pnguint32 length);
void pngwritedestroy (pngstructp pngptr);
void pngwritedestroyinfo (pnginfop infoptr);
void pngwriteend (pngstructp pngptr, pnginfop
infoptr);
void pngwriteflush (pngstructp pngptr);
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C Library Functions libpng(3)
void pngwriteimage (pngstructp pngptr, pngbytepp
image);
DEPRECATED: void pngwriteinit (pngstructp pngptr);
DEPRECATED: void pngwriteinit2 (pngstructp pngptr,
pngconstcharp userpngver, pngsizet pngstructsize,
pngsizet pnginfosize);
void pngwriteinfo (pngstructp pngptr, pnginfop
infoptr);
void pngwriteinfobeforePLTE (pngstructp pngptr,
pnginfop infoptr);
void pngwritepng (pngstructp pngptr, pnginfop infoptr,
int transforms, pngvoidp params);
void pngwriterow (pngstructp pngptr, pngbytep row);
void pngwriterows (pngstructp pngptr, pngbytepp row,
pnguint32 numrows);
DESCRIPTION
The libpng library supports encoding, decoding, and various
manipulations of the Portable Network Graphics (PNG) format
image files. The libpng library uses the zlib(3) compression
library.
For more information about libpng V1.0.15, see
http:/www.libpng.org/pub/png/libpng-1.0.15-manual.txt
For more information about libpng V1.2.5, see
http:/www.libpng.org/pub/png/libpng-manual.txt
EXTENDED DESCRIPTION
Version Numbers
Due to various miscommunications, unforeseen code incompati-
bilities and occasional factors outside the authors' con-
trol, version numbering on the library has not always been
consistent and straightforward. The following table summar-
izes matters since version 0.89c, which was the first widely
used release.
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C Library Functions libpng(3)
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C Library Functions libpng(3)
source version png.h string png.h int shared-lib version
0.89c ("beta 3") 0.89 89 1.0.89
0.90 ("beta 4") 0.90 90 0.90
0.95 ("beta 5") 0.95 95 0.95
0.96 ("beta 6") 0.96 96 0.96
0.97b ("beta 7") 1.00.97 97 1.0.1
0.97c 0.97 97 1.0.1
0.98 0.98 98 2.0.98
0.99 0.99 98 2.0.99
0.99a-m 0.99 99 2.0.99
1.00 1.00 100 2.1.0
1.0.0 1.0.0 100 2.1.0
1.0.0 * 100 2.1.0
1.0.1 10001 2.1.0
1.0.1a-e 10002 #
1.0.2 10002
1.0.2a-b 10003
1.0.1 10001
1.0.1a-e 10002 2.1.0.1a-e
1.0.2 10002 2.1.0.2
1.0.2a-b 10003 2.1.0.2a-b
1.0 10003 2.1.0
1.0a-d 10004 2.1.0a-d
1.0.4 10004 2.1.0.4
1.0.4a-f 10005 2.1.0.4a-f
1.0.5 (] 2 patches) 10005 2.1.0.5
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C Library Functions libpng(3)
1.0.5a-d 10006 2.1.0.5a-d
1.0.5e-r 10100 2.1.0.5e-r
1.0.5s-v 10006 2.1.0.5s-v
1.0.6 (] 3 patches) 10006 2.1.0.6
1.0.6d-g 10007 2.1.0.6d-g
1.0.6h 10007 10.6h
1.0.6i 10007 10.6i
1.0.6j 10007 2.1.0.6j
1.0.7beta11-14 DLNUM 10007 2.1.0.7beta11-14
1.0.7beta15-18 1 10007 2.1.0.7beta15-18
1.0.7rc1-2 1 10007 2.1.0.7rc1-2
1.0.7 1 10007 2.1.0.7
1.0.8beta1-4 1 10008 2.1.0.8beta1-4
1.0.8rc1 1 10008 2.1.0.8rc1
1.0.8 1 10008 2.1.0.8
1.0.9beta1-6 1 10009 2.1.0.9beta1-6
1.0.9rc1 1 10009 2.1.0.9rc1
1.0.9beta7-10 1 10009 2.1.0.9beta7-10
1.0.9rc2 1 10009 2.1.0.9rc2
1.0.9 1 10009 2.1.0.9
1.0.10beta1 1 10010 2.1.0.10beta1
1.0.10rc1 1 10010 2.1.0.10rc1
1.0.10 1 10010 2.1.0.10
1.0.11beta1-3 1 10011 2.1.0.11beta1-3
1.0.11rc1 1 10011 2.1.0.11rc1
1.0.11 1 10011 2.1.0.11
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C Library Functions libpng(3)
1.0.12beta1-2 1 10012 2.1.0.12beta1-2
* From this release forward, the png.h
string is identical to the source
version.
# From this release forward, the
shared library is 2.V, where V is
the source code version except as
noted.
Henceforth, the source version will match the shared-library
minor and patch numbers. The shared-library major version
number will be used for changes in backward compatibility,
as it is intended. The PNGPNGLIBVER macro, which is not
used within libpng but is available for applications, is an
unsigned integer of the form xyyzz corresponding to the
source version x.y.z (leading zeros in y and z). Beta ver-
sions were given the previous public release number plus a
letter, until version 1.0.6j. From then on, they were given
the upcoming public release number plus "betaN" or "rcN".
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWpng
Interface stability Uncommitted
SEE ALSO
libpngpf(3), png(4), attributes(5)
libpng
ftp:/ftp.uu.net/graphics/png
http:/www.libpng.org/pub/png
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C Library Functions libpng(3)
zlib
Generally at the same location as libpng or at
ftp:/ftp.uu.net/pub/archiving/zip/zlib
ftp:/ftp.info-zip.org/pub/infozip/zlib
PNGspecification:RFC2083
Generally at the same location as libpng or at
ftp:/ds.internic.net/rfc/rfc2083.txt
or as a W3C Recommendation at http:/www.w3.org/TR/REC-
png.html
In the case of any inconsistency between the PNG specifica-
tion and this library, the specification takes precedence.
NOTES
This man page was originally written by Glenn Randers-
Pehrson. Updated by Breda McColgan, Sun Microsystems Inc.,
2004.
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