home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.graphics
- Path: sparky!uunet!UB.com!pacbell.com!decwrl!elroy.jpl.nasa.gov!swrinde!sdd.hp.com!spool.mu.edu!agate!stanford.edu!nntp.Stanford.EDU!leland.Stanford.EDU!ledwards
- From: ledwards@leland.Stanford.EDU (Laurence James Edwards)
- Subject: Re: Millions! of colors...
- Message-ID: <1993Jan27.065007.11620@leland.Stanford.EDU>
- Sender: news@leland.Stanford.EDU (Mr News)
- Organization: DSG, Stanford University, CA 94305, USA
- References: <1993Jan20.180052.133265@ns1.cc.lehigh.edu> <1993Jan21.031952.4994@leland.Stanford.EDU> <1856@cogsci.ucsd.EDU>
- Date: Wed, 27 Jan 93 06:50:07 GMT
- Lines: 25
-
- In article <1856@cogsci.ucsd.EDU>, hartung@crl.ucsd.edu (Jeffrey P. Hartung) writes:
- |> In article <1993Jan21.031952.4994@leland.Stanford.EDU> ledwards@leland.Stanford.EDU (Laurence James Edwards) writes:
- |> >Well, yes you're right you can't use that many, but note there is a difference
- |> >between most 8-bit cards and 24bit cards. Almost all 8bit cards use a lookup
- |> >table with 24bit entries, whereas 24bit cards do not use a lookup table at all.
- |>
- |> Very few (S)VGA cards actually have DACs that can do 8-bits per primary.
- |> [...]
-
- yes that already has been pointed out, sorry I've been in the workstation world
- for too long, its been 7 years since I worked on a PC ... most workstations
- use 8 bits per primary.
-
- |> >Now all you really need is a 20bit card with a lookup table that has 24bit
- |> >entries, and you're range of available colors would be exactly the same (on a
- |> >1024x768 screen) as the 24bit card. But, now you've got a very large lookup
- |> >table (3MB) in addition to you're screen memory, so it's cheaper and simpler
- |> >from the hardware design standpoint to just go with the 24bits and no lookup
- |> >table.
- |>
- |> This would be silly [...]
-
- obviously ... that was the point of my little thought experiment.
-
- Larry Edwards
-