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EnigmA Amiga Run 1997 May
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EnigmA AMIGA RUN 18 (1997)(G.R. Edizioni)(IT)[!][issue 1997-05][EAR-CD II].iso
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akpng43x.rea
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1997-03-02
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Short: AkPNG-dt V43.27 (PNG, 68000-060)
Author: Andreas_Kleinert@t-online.de
Uploader: Andreas_Kleinert@t-online.de
Type: util/dtype
(68000, 020/030, 040 and 060 versions inside)
***************** NEWS FLASH *****************
V43.27 (23.02.97) : - MAJOR REVISION
- there's now a global BestModeID() patch available
as Aminet:util/sys/ModeP.lha
- there were problems with 16 Bit grayscaled images
(-> Magnus Holmgren)
- the 16 Bit bug was a side effect of a wrongly
handled pixel_depth check, thus perhaps it would
have happened with other bit_depth 16 images as well
- removed some misinterpretable information
on 16 bit (highcolor) modes, which are not
allowed with PNG, with the exception of
16 Bit grayscaled images
(-> Magnus Holmgren)
- added an overview table of valid PNG depth
combinations (refering to the specification)
- re-introduced "wm32 magic fix"
- __inline'd HAM code also, now
- there were "memory losses" under specific conditions
(below is what I found out)
(-> Magnus Holmgren)
- under low memory conditions there might have
appeared even more memory loss, since setjmp'ing
of the PNG sources did cause some high level
allocations not to be delocated - this mainly
did concern the non-V43 modes
- gfx mode selection now a little bit more
AGA sensitive, ModeP patch still recommended, though
- tested compatibility by viewing Willem van Schaik's
"PNG Test Suite" in V40 ordered dithering 8 Bit mode
(http://www.wco.com/~png/pngsuite.html). When there
is enough (chip) memory, all pictures seem to be
handled and displayed correctly (now). On the page
there are samples for all types of images (depth
combinations) as mentioned in the PNG Suite
Documentation. If you find anything not displayed
correctly, though: please tell me. Note, that
gamma correction is not applied (no need to
mention).
- 2..128 color images no longer imported as 256
color images (2 still as 4, though), this also
saves (chip) memory...
(-> Roger Hâgensen, various)
- fixed bug in reading 24 Bit + alpha channel images
in V40 HAM8 or ordered dither mode
(HAM6 worked fine)
- added some notes to the docs
- most stable version so far; nearly rock-solid
***************** NEWS FLASH *****************
akPNG.datatype
- licenseable SHAREWARE -
© 1996-97 by Andreas Ralph Kleinert. All rights reserved.
A PerSuaSiVe SoftWorX PRODUCT.
Needs Kickstart V3.x
Program information
-------------------
akPNG.datatype is a new PNG datatype, which is based on the
latest PNG sources (zlib V1.0.4, libpng 1.0 beta 4 - version 0.90).
So it does support 8 Bit color mapped files (colorspace expanded to
8 bit per component always) and True color files (24/48 Bit, alpha
channel ignored, 48 Bit 16:16:16 cut down to 24 Bit 8:8:8).
[ More detailed description can be found in akPNG.guide ]
With V39-V42 picture.datatype it either produces (upto) 256 color
palette-based or HAM6/8 output (256 colors exported unmodified,
24 Bit data either dithered or converted to HAM6/HAM8) with
Ralph Schmidt's picture.datatype V43 24 Bit may be done unmodified.
You must use the included preferences program for best configuration.
See program archive for copyright and distribution information.
============================= Archive contents =============================
Original Packed Ratio Date Time Name
-------- ------- ----- --------- -------- -------------
4596 2509 45.4% 27-Jan-97 20:55:42 +akT
86 78 9.3% 01-Nov-96 13:48:02 +PNG
467 281 39.8% 01-Nov-96 13:48:02 +PNG.info
3146 1077 65.7% 08-Feb-97 11:25:42 +Install
3234 497 84.6% 03-Jan-97 14:20:22 +Install.info
624 238 61.8% 26-Jan-97 15:34:04 +Datatypes.info
11572 6422 44.5% 01-Jan-97 12:35:38 +akPNGPrefs
3252 517 84.1% 17-Sep-96 14:25:10 +akPNGPrefs.info
624 238 61.8% 05-Jan-97 14:23:14 akPNG-Datatype.info
81680 42722 47.6% 23-Feb-97 15:46:52 +akPNG.datatype
80908 42670 47.2% 23-Feb-97 15:49:30 +akPNG.datatype.030
80840 42639 47.2% 23-Feb-97 15:59:28 +akPNG.datatype.040
80972 42738 47.2% 23-Feb-97 16:02:44 +akPNG.datatype.060
36502 13441 63.1% 23-Feb-97 15:50:40 +akPNG.guide
6888 2569 62.7% 21-Feb-97 21:40:08 +Commercial_1
-------- ------- ----- --------- --------
395391 198636 49.7% 23-Feb-97 19:02:54 15 files