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png_dt.readme
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1995-09-20
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Short: PNG DataType v1.0
Author: Cloanto Italia srl
Type: util/dtype
PNG and the PNG DataType v. 1.0, by Cloanto
When we heard news that several, very popular, graphics formats were
menaced by software patents, at Cloanto we took a strong position in favor
of a new, improved format: PNG (Portable Network Graphics).
We are presenting here a PNG DataType for the Amiga, some background
information on PNG, sample source code to use DataTypes and an ARexx
script to automatically find GIFs and convert them to PNG. As the creators
of Personal Paint, we've also included some information on that program.
The DataType supports all types of PNG-encoded images. Grayscale images
are converted to palette-based images. True color (up to 48-bit) images
are dithered using a fast Floyd-Steinberg method. (More professional color
quantization options are available in Personal Paint.)
This DataType also reads the Author, Copyright and Comment fields
(DTA_ObjAuthor, DTA_ObjCopyright and DTA_ObjAnnotation DataType
attributes). The included source code shows how to read this information.
============================= Archive contents =============================
Original Packed Ratio Date Time Name
-------- ------- ----- --------- -------- -------------
628 270 57.0% 04-Jun-95 16:33:06 PNG_dt.info
628 269 57.1% 04-Jun-95 14:21:22 +Classes.info
628 271 56.8% 05-Jun-95 16:24:20 +DataTypes.info
28328 14208 49.8% 08-Jun-95 21:12:44 +png.datatype
28008 13969 50.1% 08-Jun-95 21:12:44 +png.datatype.020
628 269 57.1% 04-Jun-95 14:21:20 +Devs.info
628 270 57.0% 04-Jun-95 14:21:16 +DataTypes.info
92 85 7.6% 02-Jun-95 19:32:20 +PNG
473 294 37.8% 05-Jun-95 17:41:40 +PNG.info
1319 641 51.4% 05-Jun-95 16:24:50 +Install-PNG
1359 593 56.3% 06-Jun-95 22:20:28 +Install-PNG.info
70999 27555 61.1% 06-Jun-95 22:44:18 +PNG.guide
503 259 48.5% 06-Jun-95 22:15:28 +PNG.guide.info
1080 580 46.2% 06-Jun-95 19:22:16 +Product-Info
8216 8182 0.4% 09-Jun-95 01:30:22 +Test.png
663 326 50.8% 09-Jun-95 01:32:36 +Test.png.info
7604 4871 35.9% 06-Jun-95 18:07:00 +ViewDT
12163 3465 71.5% 06-Jun-95 18:58:52 +ViewDT.c
-------- ------- ----- --------- --------
163947 76377 53.4% 27-Jun-95 12:02:26 18 files