mewin/libpng
1
0
Fork 0
mirror of https://git.code.sf.net/p/libpng/code.git synced 2025-07-10 18:04:09 +02:00
Code Issues Projects Releases Wiki Activity

[devel] Fixed some typos in the manual.

Browse Source
This commit is contained in:
Glenn Randers-Pehrson
2011-07-09 19:35:22 -05:00
parent 628b632419
commit ab38979670
4 changed files with 41 additions and 251 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
libpng.3
View File

@@ -1,4 +1,4 @@
.TH LIBPNG 3 "July 8, 2011"
.TH LIBPNG 3 "July 10, 2011"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.5.5beta01
.SH SYNOPSIS
@@ -955,7 +955,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng-manual.txt - A description on how to use and modify libpng
libpng version 1.5.5beta01 - July 8, 2011
libpng version 1.5.5beta01 - July 10, 2011
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -966,7 +966,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.5.5beta01 - July 8, 2011
libpng versions 0.97, January 1998, through 1.5.5beta01 - July 10, 2011
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -1793,7 +1793,7 @@ format produced by libpng to always have 8-bit or 16-bit components and then
store the color as an 8-bit or 16-bit color as appropriate. The color contains
separate gray and RGB component values, so you can let libpng produce gray or
RGB output according to the input format, but low bit depth grayscale images
must always be converted to at least 8-bit format. (Even low low bit depth
must always be converted to at least 8-bit format. (Even though low bit depth
grayscale images can't have an alpha channel they can have a transparent
color!)
@@ -1932,7 +1932,7 @@ provided by an earlier call to png_set_gamma or png_set_alpha_mode.
2) Prior to libpng-1.5.4 the background color from a bKGd chunk. This
damages the information provided by an earlier call to png_set_background
resulting in expected behavior. Libpng-1.5.4 no longer does this.
resulting in unexpected behavior. Libpng-1.5.4 no longer does this.
3) The number of significant bits in each component value. Libpng uses this to
optimize gamma handling by reducing the internal lookup table sizes.
@@ -2128,7 +2128,8 @@ pointer into the info_ptr is returned for any complex types.
png_get_bKGD(png_ptr, info_ptr, &background);
background - background color (PNG_VALID_bKGD)
background - background color (of type
png_color_16p) (PNG_VALID_bKGD)
valid 16-bit red, green and blue
values, regardless of color_type
@@ -2603,21 +2604,20 @@ If the PNG file contains a bKGD chunk (PNG_INFO_bKGD valid),
you may use this color, or supply another color more suitable for
the current display (e.g., the background color from a web page). You
need to tell libpng how the color is represented, both the format of the
component values in the color (the number of bits) and the gamme encoding of the
component values in the color (the number of bits) and the gamma encoding of the
color. The function takes two arguments, background_gamma_mode and need_expand
to convey this information, however only two combinations are like to be useful:
to convey this information, however only two combinations are likely to be
useful:
png_color_16 my_background;
png_color_16p image_background;
png_color_16p image_background, my_background;
if (png_get_bKGD(png_ptr, info_ptr, &image_background))
png_set_background(png_ptr, image_background,
PNG_BACKGROUND_GAMMA_FILE, 1/*needs to be expanded*/, 1);
else
png_set_background(png_ptr, &my_background,
png_set_background(png_ptr, info_ptr, my_background,
PNG_BACKGROUND_GAMMA_SCREEN, 0/*do not expand*/, 1);
The second call was described above - my_background is in the format of the
final, display, output produced by libpng. Because you now know the format of
the PNG it is possible to avoid the need to choose either 8-bit or 16-bit
@@ -3674,7 +3674,8 @@ width, height, bit_depth, and color_type must be the same in each call.
png_set_bKGD(png_ptr, info_ptr, background);
background - background color (PNG_VALID_bKGD)
background - background color (of type
png_color_16p) (PNG_VALID_bKGD)
png_set_text(png_ptr, info_ptr, text_ptr, num_text);
@@ -5379,7 +5380,7 @@ Other rules can be inferred by inspecting the libpng source.
.SH XIV. Y2K Compliance in libpng
July 8, 2011
July 10, 2011
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
@@ -5637,7 +5638,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.5.5beta01 - July 8, 2011:
Libpng version 1.5.5beta01 - July 10, 2011:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
@@ -5660,7 +5661,7 @@ this sentence.
This code is released under the libpng license.
libpng versions 1.2.6, August 15, 2004, through 1.5.5beta01, July 8, 2011, are
libpng versions 1.2.6, August 15, 2004, through 1.5.5beta01, July 10, 2011, 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
@@ -5759,7 +5760,7 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
July 8, 2011
July 10, 2011
.\" end of man page