Home » Archimedes archive » Acorn User » AU 1998-03 B.adf » StarInfo » Tanner/!Png2Spr/!Help
Tanner/!Png2Spr/!Help
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Acorn User » AU 1998-03 B.adf » StarInfo |
| Filename: | Tanner/!Png2Spr/!Help |
| Read OK: | ✔ |
| File size: | 1272 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
!PNG2SPR
========
(c) T. R. Tanner
6 The Mallards, Hemel Hempstead, Herts HP3 9DP
email ttehtann@argonet.co.uk
This program allows conversion of graphics in the new "PNG" format to Acorn
sprite files, and vice versa. Note that due to the Acorn sprite formats, the
program converts 16 bit RGB colours to 8 bit RGB colours. Also, transparency is
an on / off mask.
The PNG web pages (specifications & example files) are to be found at
http://www.cdrom.com/pub/png/
To convert a PNG file (type B60), double click the file, or drop the file onto
the program icon on the icon bar. To save the file when converted, click the
menu button over the displayed picture, and drag the sprite to where you want
to save it, or type in a path name and click OK.
To convert a sprite to a PNG file, drop the sprite onto the iconbar icon.
Currently there are no conversion options, apart from the "Use Gamma" item on
the iconbar menu - if this is ticked, the file is given a gamma correction of
1 / 1.8 (the inverse of my guess at the gamma value for my monitor!).
Icon Bar Menu:
Info Standard useless program info
Single Task When ticked. the program does not release control to the wimp.
It therefore converts faster (but you can't do anything else!).
Off by default.
Use Scale When ticked, the program uses the "pHYS" chunk in the file (if
supplied) to scale the picture. NOTE: The size is not
guaranteed - I will supply some method of configuring real
pixel sizes in a later version. On by default.
Use Gamma When ticked, the program uses the "gAMA" chunk in the file (if
supplied) to apply gamma correction. On by default.
Viewer Mode When ticked, supresses queries about unsaved files on closing /
quitting
Transparency When clicked, brings up a screen allowing you to select
transparency options, as follows:
Ignore Ignore transparency / alpha channels (all pixels
considered opaque).
Create mask Create a mask (pixels whose opacity is less
than the slider value are considered
transparent).
Use Background
in bKGD chunk If bKGD chunk supplied, use it. Otherwise
use the colour selected by the button.
Use specified
colour Always use the colour selected by the button.
Save Options Save the above state of ticks above for the next time you run
the program.
Quit No prizes for guessing the effect of this one!
The program supports the Acorn desktop save and help protocols.
Known Bugs:
-----------
Masks are not converted from 8bpp sprite files to PNG files (mainly
because I'd probably have to produce a truecolour image)
sBIT is not dealt with, so converting a 32k sprite to a PNG and back to
a sprite results in a 16M colour sprite.
Future Enhancements:
--------------------
1 Allow specification of compression & interlacing when converting
sprite files.
2 Tidy up interface (again)
3 Convert Acorn masks on 8bpp sprites
4 Lots of others which are in the source code...
Tedious legal message
=====================
This application is freeware. It can be distributed freely as long as only
reasonable charges are made for media and distribution. I retain copyright on
all program code and documentation contained in this distribution.
This software is supplied �as�is�: I make no warranty, expressed or
implied, of the merchantability of this software or its �tness for any
particular purpose. In no circumstances shall I be liable for any damage,
loss of pro�ts, or any indirect or consequential loss arising out of the use
of this software or inability to use this software, even if I have been
advised of the possibility of such loss.
In other words, if your computer crashes, blows up, you lose all your work
etc. all because of !Png2Spr, don�t blame me.
Acknowledgments
---------------
Thanks are due to:
Greg Roelofs, for being helpful
Nick Smith, ANT Ltd, for sending me the official PNG sprites and pointing out
that I can't spell my own name.
Nick Roberts ("tigger@argonet.co.uk") for using the program and making some
suggestions to improve it.
Stewart Brodie for doing much the same
The producers of the Zlib & PNG support libraries
Copyrights
==========
The PNG support library (libpng) is copyright as follows:
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
Copyright (c) 1996, 1997 Andreas Dilger
Guy Eric Schalnat, Group 42, Inc.
Contributing Authors:
John Bowler
Sam Bushell
Kevin Bracey
Andreas Dilger
Magnus Holmgren
Dave Martindale
Greg Roelofs
Guy Eric Schalnat
Paul Schmidt
Tom Tanner
Tim Wegner
The inflate / deflate support library (zlib) is copyright as follows:
Copyright (c) 1995-1996 Jean-loup Gailly and Mark Adler
00000000 21 50 4e 47 32 53 50 52 0a 3d 3d 3d 3d 3d 3d 3d |!PNG2SPR.=======|
00000010 3d 0a 0a 28 63 29 20 54 2e 20 52 2e 20 54 61 6e |=..(c) T. R. Tan|
00000020 6e 65 72 0a 36 20 54 68 65 20 4d 61 6c 6c 61 72 |ner.6 The Mallar|
00000030 64 73 2c 20 48 65 6d 65 6c 20 48 65 6d 70 73 74 |ds, Hemel Hempst|
00000040 65 61 64 2c 20 48 65 72 74 73 20 48 50 33 20 39 |ead, Herts HP3 9|
00000050 44 50 0a 0a 65 6d 61 69 6c 20 74 74 65 68 74 61 |DP..email ttehta|
00000060 6e 6e 40 61 72 67 6f 6e 65 74 2e 63 6f 2e 75 6b |nn@argonet.co.uk|
00000070 0a 0a 0a 54 68 69 73 20 70 72 6f 67 72 61 6d 20 |...This program |
00000080 61 6c 6c 6f 77 73 20 63 6f 6e 76 65 72 73 69 6f |allows conversio|
00000090 6e 20 6f 66 20 67 72 61 70 68 69 63 73 20 69 6e |n of graphics in|
000000a0 20 74 68 65 20 6e 65 77 20 22 50 4e 47 22 20 66 | the new "PNG" f|
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000000c0 70 72 69 74 65 20 66 69 6c 65 73 2c 20 61 6e 64 |prite files, and|
000000d0 20 76 69 63 65 20 76 65 72 73 61 2e 20 4e 6f 74 | vice versa. Not|
000000e0 65 20 74 68 61 74 20 64 75 65 20 74 6f 20 74 68 |e that due to th|
000000f0 65 20 41 63 6f 72 6e 20 73 70 72 69 74 65 20 66 |e Acorn sprite f|
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00000110 72 61 6d 20 63 6f 6e 76 65 72 74 73 20 31 36 20 |ram converts 16 |
00000120 62 69 74 20 52 47 42 20 63 6f 6c 6f 75 72 73 20 |bit RGB colours |
00000130 74 6f 20 38 20 62 69 74 20 52 47 42 20 63 6f 6c |to 8 bit RGB col|
00000140 6f 75 72 73 2e 20 41 6c 73 6f 2c 20 74 72 61 6e |ours. Also, tran|
00000150 73 70 61 72 65 6e 63 79 20 69 73 0a 61 6e 20 6f |sparency is.an o|
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00000190 20 26 20 65 78 61 6d 70 6c 65 20 66 69 6c 65 73 | & example files|
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00000260 72 74 65 64 2c 20 63 6c 69 63 6b 20 74 68 65 0a |rted, click the.|
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000002d0 65 20 69 6e 20 61 20 70 61 74 68 20 6e 61 6d 65 |e in a path name|
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000003f0 20 67 75 65 73 73 20 61 74 20 74 68 65 20 67 61 | guess at the ga|
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00000420 6e 20 42 61 72 20 4d 65 6e 75 3a 0a 0a 49 6e 66 |n Bar Menu:..Inf|
00000430 6f 09 09 53 74 61 6e 64 61 72 64 20 75 73 65 6c |o..Standard usel|
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00000460 65 6e 20 74 69 63 6b 65 64 2e 20 74 68 65 20 70 |en ticked. the p|
00000470 72 6f 67 72 61 6d 20 64 6f 65 73 20 6e 6f 74 20 |rogram does not |
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000004a0 74 20 74 68 65 72 65 66 6f 72 65 20 63 6f 6e 76 |t therefore conv|
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000005c0 20 61 20 6c 61 74 65 72 20 76 65 72 73 69 6f 6e | a later version|
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00000970 70 72 6f 74 6f 63 6f 6c 73 2e 0a 0a 4b 6e 6f 77 |protocols...Know|
00000980 6e 20 42 75 67 73 3a 0a 2d 2d 2d 2d 2d 2d 2d 2d |n Bugs:.--------|
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00000a80 72 69 74 65 2e 0a 0a 46 75 74 75 72 65 20 45 6e |rite...Future En|
00000a90 68 61 6e 63 65 6d 65 6e 74 73 3a 0a 2d 2d 2d 2d |hancements:.----|
00000aa0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
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00000b50 74 68 65 72 73 20 77 68 69 63 68 20 61 72 65 20 |thers which are |
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00000b70 64 65 2e 2e 2e 0a 0a 54 65 64 69 6f 75 73 20 6c |de.....Tedious l|
00000b80 65 67 61 6c 20 6d 65 73 73 61 67 65 0a 3d 3d 3d |egal message.===|
00000b90 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d |================|
00000ba0 3d 3d 0a 0a 20 20 20 54 68 69 73 20 61 70 70 6c |==.. This appl|
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00000bc0 61 72 65 2e 20 49 74 20 63 61 6e 20 62 65 20 64 |are. It can be d|
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00000c10 72 20 6d 65 64 69 61 20 61 6e 64 20 64 69 73 74 |r media and dist|
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00000c40 61 6c 6c 20 70 72 6f 67 72 61 6d 20 63 6f 64 65 |all program code|
00000c50 20 61 6e 64 20 64 6f 63 75 6d 65 6e 74 61 74 69 | and documentati|
00000c60 6f 6e 20 63 6f 6e 74 61 69 6e 65 64 20 69 6e 20 |on contained in |
00000c70 74 68 69 73 20 64 69 73 74 72 69 62 75 74 69 6f |this distributio|
00000c80 6e 2e 0a 0a 20 20 20 54 68 69 73 20 73 6f 66 74 |n... This soft|
00000c90 77 61 72 65 20 69 73 20 73 75 70 70 6c 69 65 64 |ware is supplied|
00000ca0 20 94 61 73 a0 69 73 95 3a 20 49 20 6d 61 6b 65 | .as.is.: I make|
00000cb0 20 6e 6f 20 77 61 72 72 61 6e 74 79 2c 20 65 78 | no warranty, ex|
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00000cf0 69 73 20 73 6f 66 74 77 61 72 65 20 6f 72 20 69 |is software or i|
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00000d10 79 0a 70 61 72 74 69 63 75 6c 61 72 20 70 75 72 |y.particular pur|
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00000eb0 2d 2d 2d 2d 2d 2d 2d 0a 0a 54 68 61 6e 6b 73 20 |-------..Thanks |
00000ec0 61 72 65 20 64 75 65 20 74 6f 3a 0a 0a 47 72 65 |are due to:..Gre|
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00000f60 6b 20 52 6f 62 65 72 74 73 20 28 22 74 69 67 67 |k Roberts ("tigg|
00000f70 65 72 40 61 72 67 6f 6e 65 74 2e 63 6f 2e 75 6b |er@argonet.co.uk|
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00001020 43 6f 70 79 72 69 67 68 74 73 0a 3d 3d 3d 3d 3d |Copyrights.=====|
00001030 3d 3d 3d 3d 3d 0a 0a 54 68 65 20 50 4e 47 20 73 |=====..The PNG s|
00001040 75 70 70 6f 72 74 20 6c 69 62 72 61 72 79 20 28 |upport library (|
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00001070 0a 20 20 20 43 6f 70 79 72 69 67 68 74 20 28 63 |. Copyright (c|
00001080 29 20 31 39 39 35 2c 20 31 39 39 36 20 47 75 79 |) 1995, 1996 Guy|
00001090 20 45 72 69 63 20 53 63 68 61 6c 6e 61 74 2c 20 | Eric Schalnat, |
000010a0 47 72 6f 75 70 20 34 32 2c 20 49 6e 63 2e 0a 20 |Group 42, Inc.. |
000010b0 20 20 43 6f 70 79 72 69 67 68 74 20 28 63 29 20 | Copyright (c) |
000010c0 31 39 39 36 2c 20 31 39 39 37 20 41 6e 64 72 65 |1996, 1997 Andre|
000010d0 61 73 20 44 69 6c 67 65 72 0a 20 20 20 47 75 79 |as Dilger. Guy|
000010e0 20 45 72 69 63 20 53 63 68 61 6c 6e 61 74 2c 20 | Eric Schalnat, |
000010f0 47 72 6f 75 70 20 34 32 2c 20 49 6e 63 2e 0a 20 |Group 42, Inc.. |
00001100 20 20 43 6f 6e 74 72 69 62 75 74 69 6e 67 20 41 | Contributing A|
00001110 75 74 68 6f 72 73 3a 0a 20 20 20 20 20 20 4a 6f |uthors:. Jo|
00001120 68 6e 20 42 6f 77 6c 65 72 0a 20 20 20 20 20 20 |hn Bowler. |
00001130 53 61 6d 20 42 75 73 68 65 6c 6c 0a 20 20 20 20 |Sam Bushell. |
00001140 20 20 4b 65 76 69 6e 20 42 72 61 63 65 79 0a 20 | Kevin Bracey. |
00001150 20 20 20 20 20 41 6e 64 72 65 61 73 20 44 69 6c | Andreas Dil|
00001160 67 65 72 0a 20 20 20 20 20 20 4d 61 67 6e 75 73 |ger. Magnus|
00001170 20 48 6f 6c 6d 67 72 65 6e 0a 20 20 20 20 20 20 | Holmgren. |
00001180 44 61 76 65 20 4d 61 72 74 69 6e 64 61 6c 65 0a |Dave Martindale.|
00001190 20 20 20 20 20 20 47 72 65 67 20 52 6f 65 6c 6f | Greg Roelo|
000011a0 66 73 0a 20 20 20 20 20 20 47 75 79 20 45 72 69 |fs. Guy Eri|
000011b0 63 20 53 63 68 61 6c 6e 61 74 0a 20 20 20 20 20 |c Schalnat. |
000011c0 20 50 61 75 6c 20 53 63 68 6d 69 64 74 0a 20 20 | Paul Schmidt. |
000011d0 20 20 20 20 54 6f 6d 20 54 61 6e 6e 65 72 0a 20 | Tom Tanner. |
000011e0 20 20 20 20 20 54 69 6d 20 57 65 67 6e 65 72 0a | Tim Wegner.|
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00001230 6c 6c 6f 77 73 3a 0a 20 20 20 43 6f 70 79 72 69 |llows:. Copyri|
00001240 67 68 74 20 28 63 29 20 31 39 39 35 2d 31 39 39 |ght (c) 1995-199|
00001250 36 20 4a 65 61 6e 2d 6c 6f 75 70 20 47 61 69 6c |6 Jean-loup Gail|
00001260 6c 79 20 61 6e 64 20 4d 61 72 6b 20 41 64 6c 65 |ly and Mark Adle|
00001270 72 0a |r.|
00001272 
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