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