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Pulling in initial English from tuxpaint-docs

Browse source 
Documentation is now maintained in a separate source repository,
'tuxpaint-docs', which allows for easier and more consisten
translation of the documentation.  Pulling in initial version of
these docs, which contain a variety of minor updates (and also a
few which had previously only been available as plain TXT are now
available as HTML).

Pulling in the English stuff.
This commit is contained in:
Bill Kendrick 2021-02-05 00:40:17 -08:00
parent 9dd4dcf4aa
commit 72019b15d1
19 changed files with 3322 additions and 5810 deletions
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docs/en/PNG.txt
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PNG.txt for Tux Paint
Tux Paint
version 0.9.26
PNG Documentation
Tux Paint - A simple drawing program for children.
Copyright © 2007-2021 by various contributors; see AUTHORS.
http://www.tuxpaint.org/
Copyright 2002-2007 by Bill Kendrick and others
bill@newbreedsoftware.com
http://www.tuxpaint.org/
June 27, 2002 - June 19, 2007
$Id$
30 January 2021
----------------------------------------------------------------------
About PNGs
----------
PNG is the Portable Network Graphic format. It is an open standard,
not burdened by patents (like GIFs). It is a highly compressed format
(though not "lossy" like JPEGs - lossiness allows files to be much
smaller, but introduces 'mistakes' in the image when saved), and
supports 24-bit color (16.7 million colors) as well as a full
"alpha channel" - that is, each pixel can have a varying degree of
transparency.
For more information, visit: http://www.libpng.org/
PNG is the Portable Network Graphic format. It is an open standard, not
burdened by patents (like GIFs). It is a highly compressed format (though
not "lossy" like JPEGs - lossiness allows files to be much smaller, but
introduces 'mistakes' in the image when saved), and supports 24-bit color
(16.7 million colors) as well as a full "alpha channel" - that is, each
pixel can have a varying degree of transparency.
These features (openness, losslessness, compression, transparency/alpha)
make it the best choice for Tux Paint. (Tux Paint's support for the PNG
format comes from the Open Source SDL_Image library, which in turn gets
it from the libPNG library.)
For more information, visit: http://www.libpng.org/
Support for many colors allows photo-quality "rubber stamp" images to
be used in Tux Paint, and alpha transparency allows for high-quality
"paint brushes."
These features (openness, losslessness, compression, transparency/alpha)
make it the best choice for Tux Paint. (Tux Paint's support for the PNG
format comes from the Open Source SDL_Image library, which in turn gets it
from the libPNG library.)
Support for many colors allows photo-quality "rubber stamp" images to be
used in Tux Paint, and alpha transparency allows for high-quality brushes.
How To Make PNGs
----------------
The following is a very _brief_ list of ways to create PNGs or
convert existing images into PNGs.
The following is a very brief list of ways to create PNGs or convert
existing images into PNGs.
Linux/Unix Users
----------------
The GIMP
--------
The best tool with which to create PNG images for use in Tux Paint is
the GNU Image Manipulation Program ("The GIMP"), a high-quality
Open Source interactive drawing and photo editing program.
GIMP & Krita
It's probably already installed on your Linux system. If not, it's
almost definitely available on the install CD or from your
distribution's download site. Otherwise:
Excellent tools with which to create PNG images for use in Tux Paint are
GIMP and Krita, both high-quality Open Source interactive drawing and
photo editing programs.
http://www.gimp.org/
Krita
-----
Krita is a painting and image editing application for KOffice.
http://koffice.kde.org/krita/
It is likely that one or both are already installed on your system. If
not, they should be readily available from your Linux distribution's
software repository. If not, or to learn more, visit http://www.gimp.org/
and http://www.krita.org/, respectively.
Command-line Tools
NetPBM
------
The Portable Bitmap tools (collectively known as "NetPBM") is a
collection of Open Source command-line tools which convert to and from
various formats, including GIF, TIFF, BMP, PNG, and many more.
NOTE: The NetPBM formats (Portable Bitmap: PBM,
Portable Greymap: PGM, Portable Pixmap: PPM, and the catch-all
Portable Any Map: PNM) do not support alpha, so any transparency
information (e.g. from within a GIF) will be lost! Use The GIMP!
It's probably already installed on your Linux system. If not, it's
almost definitely available on the install CD or from your
distribution's download site. Otherwise:
http://netpbm.sourceforge.net/
The Portable Bitmap tools (collectively known as "NetPBM") is a collection
of Open Source command-line tools which convert to and from various
formats, including GIF, TIFF, BMP, PNG, and many more.
It is possible that it's already installed on your system. If not, they it
be readily available from your Linux distribution's software repository.
If not, or to learn more, visit http://netpbm.sourceforge.net/.
cjpeg/djpeg
-----------
The "cjpeg" and "djpeg" command-line programs convert between
the NetPBM Portable Any Map (PNM) format and JPEGs.
It's probably already installed on your Linux system.
(Under Debian, this is available in the package "libjpeg-progs".)
If not, it's almost definitely available on the install CD or from
your distribution's download site. Otherwise:
ftp://ftp.uu.net/graphics/jpeg/
The "cjpeg" and "djpeg" command-line programs convert between the NetPBM
Portable Any Map (PNM) format and JPEGs. It is possible that it's already
installed on your system. If not, they it be readily available from your
Linux distribution's software repository. If not, or to learn more, visit
https://jpegclub.org/.
Windows Users
-------------
The Gimp
http://www.gimp.org/~tml/gimp/win32/
Canvas (Deneba)
http://www.deneba.com/products/canvas8/default2.html
CorelDRAW (Corel)
http://www.corel.com/
Fireworks (Macromedia)
http://macromedia.com/software/fireworks/
Illustrator (Adobe)
http://www.adobe.com/products/illustrator/main.html
Paint Shop Pro (Jasc)
http://www.jasc.com/products/psp/
Photoshop (Adobe)
http://www.adobe.com/products/photoshop/main.html
PIXresizer (Bluefive software)
http://bluefive.pair.com/pixresizer.htm
* CorelDRAW (Corel) — http://www.corel.com/
* Illustrator (Adobe) — http://www.adobe.com/products/illustrator.html
* Paint Shop Pro (Corel) — https://www.paintshoppro.com/
* Photoshop (Adobe) — http://www.adobe.com/products/photoshop.html
* PIXresizer (Bluefive software) —
http://bluefive.pair.com/pixresizer.htm
Macintosh Users
---------------
Canvas (Deneba)
http://www.deneba.com/products/canvas8/default2.html
CorelDRAW (Corel)
http://www.corel.com/
Fireworks (Macromedia)
http://macromedia.com/software/fireworks/
GraphicConverter (Lemke Software)
http://www.lemkesoft.de/us_gcabout.html
Illustrator (Adobe)
http://www.adobe.com/products/illustrator/main.html
Photoshop (Adobe)
http://www.adobe.com/products/photoshop/main.html
More Info.
----------
The libPNG website lists image editors and image converts that
support the PNG format:
http://www.libpng.org/pub/png/pngaped.html
http://www.libpng.org/pub/png/pngapcv.html
* CorelDRAW (Corel) — http://www.corel.com/
* GraphicConverter (Lemke Software) —
https://www.lemkesoft.de/mac-fotobearbeitung-mac-diashow-mac-grafikprogramm-mac-bildbetrachter/
* Illustrator (Adobe) — http://www.adobe.com/products/illustrator.html
* Photoshop (Adobe) — http://www.adobe.com/products/photoshop.html