Imported from libpng-1.4.0beta47.tar

libpng.3

@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "December 10, 2008"
+.TH LIBPNG 3 "December 15, 2008"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.4.0beta46
+libpng \- Portable Network Graphics (PNG) Reference Library 1.4.0beta47
 .SH SYNOPSIS
 \fI\fB
 
@@ -809,7 +809,7 @@ 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 1.4.0beta46 - December 10, 2008
+ libpng version 1.4.0beta47 - December 15, 2008
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2005 Glenn Randers-Pehrson
@@ -1204,7 +1204,7 @@ you want to do are limited to the following set:
     PNG_TRANSFORM_SWAP_ENDIAN   Byte-swap 16-bit samples
 
 (This excludes setting a background color, doing gamma transformation,
-dithering, and setting filler.)  If this is the case, simply do this:
+and setting filler.)  If this is the case, simply do this:
 
     png_read_png(png_ptr, info_ptr, png_transforms, NULL)
 
@@ -1850,39 +1850,6 @@ recommended that PNG viewers support gamma correction.
    else
       png_set_gamma(png_ptr, screen_gamma, 0.45455);
 
-If you need to reduce an RGB file to a paletted file, or if a paletted
-file has more entries then will fit on your screen, png_set_dither()
-will do that.  Note that this is a simple match dither that merely
-finds the closest color available.  This should work fairly well with
-optimized palettes, and fairly badly with linear color cubes.  If you
-pass a palette that is larger then maximum_colors, the file will
-reduce the number of colors in the palette so it will fit into
-maximum_colors.  If there is a histogram, it will use it to make
-more intelligent choices when reducing the palette.  If there is no
-histogram, it may not do as good a job.
-
-   if (color_type & PNG_COLOR_MASK_COLOR)
-   {
-      if (png_get_valid(png_ptr, info_ptr,
-         PNG_INFO_PLTE))
-      {
-         png_uint_16p histogram = NULL;
-
-         png_get_hIST(png_ptr, info_ptr,
-            &histogram);
-         png_set_dither(png_ptr, palette, num_palette,
-            max_screen_colors, histogram, 1);
-      }
-      else
-      {
-         png_color std_color_cube[MAX_SCREEN_COLORS] =
-            { ... colors ... };
-
-         png_set_dither(png_ptr, std_color_cube,
-            MAX_SCREEN_COLORS, MAX_SCREEN_COLORS,
-            NULL,0);
-      }
-   }
 
 PNG files describe monochrome as black being zero and white being one.
 The following code will reverse this (make black be one and white be
@@ -3631,13 +3598,13 @@ application:
 
 .SH IX. Y2K Compliance in libpng
 
-December 10, 2008
+December 15, 2008
 
 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 1.4.0beta46 are Y2K compliant.  It is my belief that earlier
+upward through 1.4.0beta47 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
@@ -3861,7 +3828,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.4.0beta46 - December 10, 2008:
+Libpng version 1.4.0beta47 - December 15, 2008:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -3882,7 +3849,7 @@ included in the libpng distribution, the latter shall prevail.)
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.4.0beta46, December 10, 2008, are
+libpng versions 1.2.6, August 15, 2004, through 1.4.0beta47, December 15, 2008, are
 Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -3981,7 +3948,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-December 10, 2008
+December 15, 2008
 
 .\" end of man page