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Diffstat (limited to 'libpng.3')
| -rw-r--r-- | libpng.3 | 61 |
1 files changed, 37 insertions, 24 deletions
@@ -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. - -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). +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 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 |