source: tuxpaint/trunk/fuentes/docs/PNG.txt @ 219

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1PNG.txt for Tux Paint
2
3Tux Paint - A simple drawing program for children.
4
5Copyright 2002-2007 by Bill Kendrick and others
6bill@newbreedsoftware.com
7http://www.tuxpaint.org/
8
9June 27, 2002 - June 19, 2007
10$Id: PNG.txt,v 1.6 2007/06/19 20:21:54 wkendrick Exp $
11
12
13About PNGs
14----------
15  PNG is the Portable Network Graphic format.  It is an open standard,
16  not burdened by patents (like GIFs).  It is a highly compressed format
17  (though not "lossy" like JPEGs - lossiness allows files to be much
18  smaller, but introduces 'mistakes' in the image when saved), and
19  supports 24-bit color (16.7 million colors) as well as a full
20  "alpha channel" - that is, each pixel can have a varying degree of
21  transparency.
22
23  For more information, visit:  http://www.libpng.org/
24
25  These features (openness, losslessness, compression, transparency/alpha)
26  make it the best choice for Tux Paint.  (Tux Paint's support for the PNG
27  format comes from the Open Source SDL_Image library, which in turn gets
28  it from the libPNG library.)
29
30  Support for many colors allows photo-quality "rubber stamp" images to
31  be used in Tux Paint, and alpha transparency allows for high-quality
32  "paint brushes."
33
34
35How To Make PNGs
36----------------
37  The following is a very _brief_ list of ways to create PNGs or
38  convert existing images into PNGs.
39
40
41  Linux/Unix Users
42  ----------------
43    The GIMP
44    --------
45      The best tool with which to create PNG images for use in Tux Paint is
46      the GNU Image Manipulation Program ("The GIMP"), a high-quality
47      Open Source interactive drawing and photo editing program.
48
49      It's probably already installed on your Linux system.  If not, it's
50      almost definitely available on the install CD or from your
51      distribution's download site.  Otherwise:
52
53        http://www.gimp.org/
54
55
56    Krita
57    -----
58      Krita is a painting and image editing application for KOffice.
59
60        http://koffice.kde.org/krita/
61
62
63    NetPBM
64    ------
65      The Portable Bitmap tools (collectively known as "NetPBM") is a
66      collection of Open Source command-line tools which convert to and from
67      various formats, including GIF, TIFF, BMP, PNG, and many more.
68
69      NOTE: The NetPBM formats (Portable Bitmap: PBM,
70      Portable Greymap: PGM, Portable Pixmap: PPM, and the catch-all
71      Portable Any Map: PNM) do not support alpha, so any transparency
72      information (e.g. from within a GIF) will be lost!  Use The GIMP!
73
74      It's probably already installed on your Linux system.  If not, it's
75      almost definitely available on the install CD or from your
76      distribution's download site.  Otherwise:
77
78        http://netpbm.sourceforge.net/
79
80
81    cjpeg/djpeg
82    -----------
83      The "cjpeg" and "djpeg" command-line programs convert between
84      the NetPBM Portable Any Map (PNM) format and JPEGs.
85
86      It's probably already installed on your Linux system.
87      (Under Debian, this is available in the package "libjpeg-progs".)
88      If not, it's almost definitely available on the install CD or from
89      your distribution's download site.  Otherwise:
90
91        ftp://ftp.uu.net/graphics/jpeg/
92
93
94  Windows Users
95  -------------
96    The Gimp
97      http://www.gimp.org/~tml/gimp/win32/
98
99    Canvas (Deneba)
100      http://www.deneba.com/products/canvas8/default2.html
101
102    CorelDRAW (Corel)
103      http://www.corel.com/
104
105    Fireworks (Macromedia)
106      http://macromedia.com/software/fireworks/
107     
108    Illustrator (Adobe)
109      http://www.adobe.com/products/illustrator/main.html
110
111    Paint Shop Pro (Jasc)
112      http://www.jasc.com/products/psp/
113   
114    Photoshop (Adobe)
115      http://www.adobe.com/products/photoshop/main.html
116
117    PIXresizer (Bluefive software)
118      http://bluefive.pair.com/pixresizer.htm
119
120
121  Macintosh Users
122  ---------------
123    Canvas (Deneba)
124      http://www.deneba.com/products/canvas8/default2.html
125
126    CorelDRAW (Corel)
127      http://www.corel.com/
128
129    Fireworks (Macromedia)
130      http://macromedia.com/software/fireworks/
131
132    GraphicConverter (Lemke Software)
133      http://www.lemkesoft.de/us_gcabout.html
134
135    Illustrator (Adobe)
136      http://www.adobe.com/products/illustrator/main.html
137     
138    Photoshop (Adobe)
139      http://www.adobe.com/products/photoshop/main.html
140
141
142More Info.
143----------
144  The libPNG website lists image editors and image converts that
145  support the PNG format:
146
147    http://www.libpng.org/pub/png/pngaped.html
148    http://www.libpng.org/pub/png/pngapcv.html
149
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