Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!rpi!masscomp!calvin!mark
From: mark@calvin..westford.ccur.com (Mark Thompson)
Newsgroups: comp.sys.amiga
Subject: Re: 24 bit color boards
Keywords: 24bit, color
Message-ID: <61486@masscomp.ccur.com>
Date: 1 Dec 90 15:42:35 GMT
References: <10634@ur-cc.UUCP> <1990Nov28.230731.29008@zorch.SF-Bay.ORG> <1990Nov29.091646.30595@cunixf.cc.columbia.edu>
Sender: news@masscomp.ccur.com
Reply-To: mark@calvin.westford.ccur.com (Mark Thompson)
Organization: Concurrent Computer Corp. Westford MA.
Lines: 33

In article <1990Nov29.091646.30595@cunixf.cc.columbia.edu> es1@cunixb.cc.columbia.edu (Ethan Solomita) writes:
>In article <1990Nov28.230731.29008@zorch.SF-Bay.ORG> xanthian@zorch.SF-Bay.ORG (Kent Paul Dolan) writes:
>>gest_ss@uhura.cc.rochester.edu (Gavin Stark) writes:
>>> Has anyone had any experience with either of these boards? A 24 bit
>>> board for $399 is quite a temptation, and sounds a bit too good to be
>>> true.

>>Sigh. As indeed it is. These manufacturers are abusing standard
>>terminology to lure in the gullible. They are not
>>giving you three byte deep pixels, but merely three byte wide color
>>output, from a color look up table driven by one byte deep pixels.
>>No big deal; save your money for the real thing.

>I know nothing about the MAST product (I have strong
>fears of anything that company puts out) but you are absolutely
>wrong about DCTV. The result is really hard to
>tell from NTSC TV images, although they have that characteristic
>NTSC flicker.

He is NOT wrong. DCTV is NOT a true color 24bit frame buffer!!!!!!!
They do some fancy image compression and they may get images that look
like NTSC but they are NOT 24bit true color. You can see the difference
plainly when you compare a 640x480 RGB 24bit color image with a lot of color
detail to that of DCTV. What you get with DCTV is an image that looks
like a TV image, unlike a 24bit RGB image on a monitor. This is all well
and fine for video applications where luma and chroma bandwidth are
strictly limited anyway.
+--------------------------------------------------------------------------+
|  Mark Thompson                                                           |
|  mark@westford.ccur.com                                                  |
|  ...!{decvax,uunet}!masscomp!mark   Designing high performance graphics  |
|  (508)392-2480                      engines today for a better tomorrow. |
+------------------------------------------------------------------------- +