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Megahits 5 (1994)(GTI - Rhein-Main-Soft)(DE)(Disc 2 of 2)[!].iso
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1994-06-02
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version 1.0, June 1st 1994
"cpraw" a converter for ColourPic chunky to planes
This utility is useful for those of you with a ColourPic (also known as
SuperPic) video-digitizer. If you do not use one, stop reading and just
spread this so that someone who might own one can use it.
The ColourPic comes with exceptionally poor software. Therefore someone
took the liberty of making a new program called Cabaret (and Cabaret Gold).
This program is a vast improvement over the original software, however the
digitzer is still better than the software. In other words: the software
doesn't use all of the hardware's capabilities.
A program that is able to handle the ColourPic's quality is ADpro, the art
department. Regrettably there is no ColourPic driver for ADpro. This is
where "cpraw" comes in. cpraw converts Cabaret's ".raw" format into 16 bit
(65536 colours) ILBM format, which can be read by ADpro. So you will still
use Cabaret to digitize, but ADpro can make MUCH better IFF pictures from
the digitzer than Cabaret.
The ".raw" format isn't compressed in any way. It cannot be read by ADpro
directly because the ".raw" format is a chunky pixel format, whereas the
Amiga uses bitplanes.
I use an Amiga 500+, so I have an ECS chip-set. I don't know how this
program will work on an AA machine; especially the part with ADpro should
change when using AA.
How to act:
1. Set up the digitizer and Cabaret
2. Digitze a picture and import it (number of colours doesn't matter)
3. Save the picture as "raw"
4. Open a Shell and type
cpraw <NameOfTheRawFile >NameOfThe16bitILBM
(which can also be concluded after trying "cpraw ?" which will result in
"cpraw Usage: cpraw <infile >outfile")
5. Now load the 16bit (it's actually 15 bit + 1) ILBM file in ADpro and
render it.
6. Admire the difference!
Within ADpro
The major advantage of ADpro over Cabaret is ADpro's dithering mode. This
works best when there is room for dithering. After some experimenting I
found out that it really shows when a picture is first converted to
interlace and than dithered to HAM. Try:
1. Load 16 bit ILBM file
2. Scale to 200% (320×512, LoRes interlace)
3. Turn interlace ON
4. Choose HAM mode
5. Execute
to do this I included an ARexx script called "cpraw.rexx", which should be
included in this archive. To use it create a ".raw" picture and convert it
using cpraw. Run adpro. Type (from within a shell): "rx cpraw" and the ARexx
script will control ADpro for you. When using ADpro 2.5.0 or higher one can
even put cpraw.rexx between the other user commands.
Installing
cpraw doesn't have to be installed. It doesn't use any library or handler.
I suggest you put cpraw in your C: directory.
Examples
To show the huge improvement in quality I included some pictures in this
archive. Each time one saved with Cabaret and once done with cpraw and ADpro.
See for yourself.
Of course the ColourPic isn't the best digitzer available (anymore) so
don't expect miracles. Pictures with lots of different colours will look
worse than those with less colours. Try a face and a colour-ful landscape
and see the difference.
Using DirectoryOpus
When using DirectoryOpus, it might be useful to create a special "cpraw"
button. The commands for this button should read:
AmigaDOS C:cpraw <{fu} >{d}{o}.ILBM15 {Dr}
Credits
I didn't actually write cpraw; I just had the idea and the equipment. I did
only write this doc-file and the ARexx script. I don't even own a ColourPic
(however I have borrowed one for months now :-)
The actual program has been written by a friend : Raymond
He's a real C-wizard. Regrettably he never writes something really useful,
this is an exception ...
The digitzer has been supplied by another friend: Sander
Try calling his BBS: +31 (0)2294-4442 "The Undiscovered BBS"
or +31 (0)2294-1442 (second Node)
-Ivo
+----------------///-------+-----------------+----------------------------+
| Ivo Kroone /// makes | Friends don't | Internet: |
| \\\/// it | let friends use | ab2693@triton.heao.hsa.nl |
| Only AMIGA \XX/ possible | MS-DOS. | (D.G.I.F. # 8156) |
+--------------------------+-----------------+----------------------------+