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Glenn Randers-Pehrson
1999-10-01 14:22:25 -05:00
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libpng.3
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@@ -1,6 +1,6 @@
.TH LIBPNG 3 "September 19, 1999"
.TH LIBPNG 3 "October 1, 1999"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.4 - September 19, 1999
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.4c - October 1, 1999
.SH SYNOPSIS
\fI\fB
@@ -617,7 +617,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng.txt - A description on how to use and modify libpng
libpng version 1.0.4 - September 19, 1999
libpng version 1.0.4c - October 1, 1999
Updated and distributed by Glenn Randers-Pehrson
<randeg@alum.rpi.edu>
Copyright (c) 1998, 1999 Glenn Randers-Pehrson
@@ -1314,17 +1314,15 @@ or as an RGB triplet that may or may not be in the palette (need_expand = 0).
To properly display PNG images on any kind of system, the application needs
to know what the display gamma is. Ideally, the user will know this, and
the application will allow them to set it. One method of allowing the user
to set the display gamma separately for each system is to check for the
DISPLAY_GAMMA and VIEWING_GAMMA environment variables or for a SCREEN_GAMMA
environment variable, which will hopefully be correctly set.
to set the display gamma separately for each system is to check for a
SCREEN_GAMMA or DISPLAY_GAMMA environment variable, which will hopefully be
correctly set.
Note that display_gamma is the gamma of your display, while screen_gamma is
the overall gamma correction required to produce pleasing results,
which depends on the lighting conditions in the surrounding environment.
Screen_gamma is display_gamma/viewing_gamma, where viewing_gamma is
the amount of additional gamma correction needed to compensate for
a (viewing_gamma=1.25) environment. In a dim or brightly lit room, no
compensation other than the display_gamma is needed (viewing_gamma=1.0).
Note that display_gamma is the overall gamma correction required to produce
pleasing results, which depends on the lighting conditions in the surrounding
environment. In a dim or brightly lit room, no compensation other than
the physical gamma exponent of the monitor is needed, while in a dark room
a slightly smaller exponent is better.
double gamma, screen_gamma;
@@ -2677,13 +2675,13 @@ the old method.
.SH VII. Y2K Compliance in libpng
January 13, 1999
October 1, 1999
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.0.4 are Y2K compliant. It is my belief that earlier
upward through 1.0.4c are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
@@ -2802,12 +2800,6 @@ and this library, the specification takes precedence.
.SH AUTHORS
This man page: Glenn Randers-Pehrson
<randeg@alum.rpi.edu>
Contributing Authors: John Bowler, Kevin Bracey, Sam Bushell, Andreas Dilger,
Magnus Holmgren, Tom Lane, Dave Martindale, Glenn Randers-Pehrson,
Greg Roelofs, Guy Eric Schalnat, Paul Schmidt, Tom Tanner, Willem van
Schaik, Tim Wegner.
<png-implement@ccrc.wustl.edu>
The contributing authors would like to thank all those who helped
with testing, bug fixes, and patience. This wouldn't have been
@@ -2815,7 +2807,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.0.4 - September 19, 1999:
Libpng version 1.0.4c - October 1, 1999:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (randeg@alum.rpi.edu).
@@ -2830,7 +2822,25 @@ Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
Copyright (c) 1996, 1997 Andreas Dilger
(libpng versions 0.90, December 1996, through 0.96, May 1997)
Copyright (c) 1998, 1999 Glenn Randers-Pehrson
(libpng versions 0.97, January 1998, through 1.0.4, September 19, 1999)
(libpng versions 0.97, January 1998, through 1.0.4c, October 1, 1999)
For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:
John Bowler
Kevin Bracey
Sam Bushell
Andreas Dilger
Magnus Holmgren
Tom Lane
Dave Martindale
Glenn Randers-Pehrson
Greg Roelofs
Guy Eric Schalnat
Paul Schmidt
Tom Tanner
Willem van Schaik
Tim Wegner
The PNG Reference Library (libpng) is supplied "AS IS". The Contributing
Authors and Group 42, Inc. disclaim all warranties, expressed or implied,
@@ -2869,5 +2879,8 @@ boxes and the like:
Also, the PNG logo (in PNG format, of course) is supplied in the
file "pngnow.png".
Libpng is OSI Certified Open Source Software. OSI Certified is a
certification mark of the Open Source Initiative.
.\" end of man page