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Conference hydra::amiga_v1

Title:AMIGA NOTES
Notice:Join us in the *NEW* conference - HYDRA::AMIGA_V2
Moderator:HYDRA::MOORE
Created:Sat Apr 26 1986
Last Modified:Wed Feb 05 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:5378
Total number of notes:38326

3098.0. "4096 in hi-res?" by GUCCI::HERB () Mon Nov 13 1989 22:05

    Has anybody looked at the back cover of the latest amigaworld???
    It says digiview gold 4.0 can show 4096 colors at onec in
    hi-res....whats the catch?
    
    mat
    
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3098.1Sounds interesting...SMAUG::SPODARYKBinary ThrottleTue Nov 14 1989 01:4919
    It's done with mirrors. :^)
    
    Actually, there's been some discussion of this in AMIGA_TECH
    (amiga.tech) and the idea is to swap the color registers for
    each and every scanline.  The screen is still a 4 bitplane screen,
    but due to the Amiga's very capable graphics chip, up to 4096
    colors are usable.  
    
    I haven't seen it, but like SHAM it's supposed to take _most_
    of your Amiga's CPU power to pull it off.  I don't believe 
    this format is IFF compatible, but I only know what I've read.
    
    In theory, it sounds easy enough... for each scanline swap the
    color registers with the next set.  Then when you think about it
    for a minute, how many computers allow you scanline control over
    the displays?  The custom chips give us the 'sliding' screens in
    various resolutions/color schemes, and a whole lot more.
    
    Will it steal all a '020s cycles?  I can't wait to see it!
3098.2maybe i can sell my perfect visionGUCCI::HERBWed Nov 15 1989 01:077
    From what a friend told me.. he says it takes up so much of the
    system you can do nothing with the display mode besides display
    a picture.  So I guess no paint program for it.. And I still have
    perfect vision. 
    
    mat
    
3098.3BAGELS::BRANNONDave BrannonThu Nov 16 1989 20:456
    Digipaint III has support for what they call 4096+ mode.
    
    Don't know if that is the 4096 Hires mode, but I think I saw a claim
    that Digipaint III already supports that new mode.
    
    -Dave
3098.4I want to see a dynamic HAM pic. !!GUCCI::HERBThu Nov 16 1989 23:468
    no...thats not "dynamic HAM". I think 4096+ is 24-bit color..or
    something like that.
    
    I am so unhappy that I got perfect vision. Any software updates
    for it? Could I possibly use the digi-view software with it?
    
    mat
    
3098.5WJG::GUINEAUQuantum RealityFri Nov 17 1989 10:505
If the 4096+ is like DigiView's (which probably is since they are both from
the same company), then it's (I think) just standard HAM using some dithering
techniques to get 2 million(?) apparent colors.

John
3098.6HYSTER::DEARBORNTrouvez MieuxFri Nov 17 1989 16:376
Yeah, 4096+ is just an enhanced version of HAM mode.  It gives 
you a slightly clearer picture.  It seems to eliminate some of 
the fringing associated with HAM mode but is still either 320x200 
or 320X400.

Randy
3098.7I just want to see a dynamic HAM pic.!GUCCI::HERBMon Nov 20 1989 22:434
    I must get my hands on a hi-res HAM pic. I gotta see one soon!
    
    mat
    
3098.8A similar example...BOMBE::MOOREBaN CaSe_sEnSiTiVe iDeNtIfIeRs!Tue Nov 21 1989 03:1711
    The current issue of Compute's Amiga Resource disk contains a picture
    viewer program ("V") and a sample 'sliced-HAM' picture.  I happened to
    have a copy of the normal HAM version of the same (tropical fish) 
    picture, so i could compare the difference.  Their sHAM version is much
    cleaner!  I believe this is similar to 'dynamic HAM', but I don't know
    for certain.
    
    By the way, V appears to be a pretty decent viewer.  It's reasonably
    compact, works from either the CLI or Workbench, and includes a fairly
    nice file requester.  Sorry, I don't think I can upload it, it's
    copyrighted by Compute!
3098.9BAGELS::BRANNONDave BrannonTue Nov 21 1989 08:2511
    So now we have 2 groups doing display interrupt pics.  Any news
    if either bunch has approached CBM about getting a blessed IFF
    format to do that?
    
    I assume NewTek is going to do something like SHAM to enhance
    HAM pics (seems like too good a trick to ignore).
    
    Hopefully we'll get a blessed spec before too many folks start
    implementing their own formats.
    
    -Dave