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- In this disk you will find 'PD software' wich can help you write programs
- to display or modify graphics on the Amiga with capabilities wich are not
- yet fully implemented in the commercial software. The most important thing
- is that you can display all lo-res pictures (even with interlace/overscan)
- with more color than usual.
-
- In the disk you will find utilities to convert pictures from GIF to HAM
- and viceversa, utilities to display pictures with BEAM, SHAM, CTBL chunks,
- and well commented source code ready to modify and use.
-
- There are the original IFF_sources for reading and writing IFF_ILBM files.
-
- CAMG, CRNG, CCRT chunks added by Carolyn Schepner of Commodore Amiga, Inc.
-
- They have been slightly modified by Diego Perini of Quest, to compile and
- link with 16-bit libraries both with Lattice and Aztec compilers/linkers.
-
- Minor changes done : "L"'s appended to all constants, all "int"'s changed
- to "long"'s, all untyped functions such as "sizeof" typecasted to (LONG).
-
- Major changes done : ILBM routines know the new chunk type "BEAM" proposed
- by Quest. Holds one palette for every scan line. It allows lot of colors !
-
- It differs from 'SHAM' in that it really use a different palette for every
- scan line considering both frames (even/odd) of interlaced pictures so for
- a 512 line picture there are 512 palette not 256 like in SHAM. This allows
- for much sharper (defined) pictures. It will be incorporated in digitizers
- allowing all low-resolution modes of Amiga to take advantage of this.
-
- The program can't show hi-res pictures. Hi-res does not allow palettes of
- 4096 colors on each line, just 16 out of 4096. This looks great, but this
- hogs the machine disallowing multitasking wich is the best of Amiga !!!
-
- Furthermore this way of doing palette changes on every line let the 68000
- to run at full speed without any intervention nor interruption. Only the
- copper is doing crazy things to follow up with the beam speed. This will
- let developers include this display mode in program for image manipulation
- paint (?), ray-tracing/rendering, digitizers, scanners, etc...
-
- Conversion tools already exists on many bulletin boards or on BIX. See for
- ShamView3.zoo, TmpToDP, HamGIF, AmGIF to convert GIF picture to SHAM.
-
- We still do not have original pictures that show the full capability of
- our display routines. We would appreciate very much any contribution.
-
- We are especially looking for contact with ASDG, NewTek, and all the other
- implementing dynamic-res in their wonderful software, Rhett Andersen that
- gave me ideas on implementing this mode and Jonathan Hue wich have a very
- good 24 bit to HAM conversion algorithm from what I have seen.
-
- All Electronic Arts routines are public domain. Quest routines are pd too!
-
- For more information consult:
-
- Amiga ROM Kernel Refernce Manual : Includes & Autodocs - Revised & Updated
-
- or contact Diego Perini c/o:
-
- Quest Software
-
- Via Elena da Persico, 24
-
- 37136 Verona - IT
-
- Tel/Fax: (045) - 585302
-
- or on BIX as 'dperini'.
-
- Enjoy it !!!
-
-
- PS: Please if you downloaded this, let me hear your comments/suggestions.
-