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Conference 7.286::atarist

Title:Atari ST, TT, & Falcon
Notice:Please read note 1.0 and its replies before posting!
Moderator:FUNYET::ANDERSON
Created:Mon Apr 04 1988
Last Modified:Tue May 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1433
Total number of notes:10312

1309.0. "NEO to GIF" by MOVIES::HOWELL_MA (another fine product of the Sirius Cybernetics Corp.) Mon Sep 21 1992 04:18

    I've been playing around with converting NEO pictures to GIF files. So
    far I've managed to get a GIF picture, but I'm not entirely happy with
    the color. Could somebody explain how the following work:
    
    1. The ST palette. I've got the 16 sets of RGB intensity levels, ranging
    from 0 to 7 for each colour, from the NEO file. How would these
    intensity levels map to the DECwindows RGB colours? Is it a straight
    multiplication factor (which I'm using at the moment) or do you need to
    apply a conversion algorithm.
    
    2. The ST screen memory. How is this arranged? It looks like the NEO
    file stores bit planes rather than pixel values. The bit planes seem to
    be chopped up into 16 pixel 'packets' with plane 0 bits in the first 2
    words, plane 1 bits in the next 2 words, etc. up to plane 3. Is this the
    way it is actually stored? From a hardware point of view this looks
    like a strange layout. I would have expected all plane 0 bits for every
    pixel followed by all plane 1 bits, etc.
    
    Does anybody have the sources to any of the existing NEO conversion
    utilities that I could look at?
    
    Thanks
    
    Mark...
T.RTitleUserPersonal
Name		DateLines
1309.1"ST Internals" recommended to me...FORTY2::CADWALLADERReaping time has come...Mon Sep 21 1992 08:498
Hi,
	I actually own an Amiga, but at the time I was considering which
machine to buy, and how easy it was to code on each plus what references I'd
need I was VERY strongly recommended Abacus's (?) "ST Internals". It is
only �15 so is good value, I'm sure this would cover you for just about all
of the ST-side aspects...

								- JIM CAD*
1309.2Grafic Converter "KARMA"UFHIS::BFALKENSTEINMon Sep 21 1992 11:559
    
    don't know if this is of any help for you: there is a commercial
    program around in Germany which does a lot of conversions. I know
    that it handles .GIF, .TIF, .IFF aso. It's called "KARMA" and costs
    59.-DM (about 42$).
    
    Bernd
1309.3Picture file formats from Dave BaggettYNGSTR::WALLACEMon Sep 21 1992 11:566
The file PICFORMT.DOC from Usenet describes quite a number of picture file
formats used on the ST (including NEOchrome).

The file can be copied from OLDTMR::$1$DUA8:[WALLACE.PUBLIC.ST]

	Ray
1309.4MOVIES::HOWELL_MAanother fine product of the Sirius Cybernetics Corp.Mon Sep 21 1992 12:0718
    re: .1 .2 .3
    
    Thanks for your replies. This was just going to be a quick hack. I have
    all the code written but I was unhappy about the colours, so I just
    wanted to check on my understanding of the palette and screen memory
    format.
    
    I looked at the PICFMT.DOC which told me the palette format and NEO
    layout. All it said for the picture data was: 16000 words of screen
    memory. I had to guess the format from the data. BTW I'm doing this on
    VMS.
    
    Does anybody have the sources for the xx_NEO conversion programs? This
    would help a lot.
    
    Thanks
    
    Mark...
1309.5Lets try this againYNGSTR::WALLACETue Sep 22 1992 11:418
I thought that picture document explained the mapping of data to pixels, but I
just looked and couldn't find the info either.

I just put VTNEO.C in the same directory. It does explain the mapping, as well
as giving example code. The program was written by ? Engberg (sorry I don't
recall his first name).

	Ray
1309.6MOVIES::HOWELL_MAanother fine product of the Sirius Cybernetics Corp.Wed Sep 23 1992 04:035
    re: .5
    
    Many thanks Ray
    
    Mark...