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From: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Newsgroups: comp.sys.amiga.advocacy,comp.sys.amiga.multimedia
Subject: Re: CDTV News
Message-ID: <1349@cbmger.UUCP>
Date: 13 Jun 91 07:08:59 GMT
References: <1991Jun12.192948.20028@mintaka.lcs.mit.edu> <1991Jun12.205030.4401@news.iastate.edu>
Reply-To: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Organization: Commodore Bueromaschinen GmbH, West Germany
Lines: 46

In article <1991Jun12.205030.4401@news.iastate.edu> taab5@isuvax.iastate.edu writes:
>In article <1991Jun12.192948.20028@mintaka.lcs.mit.edu>, rjc@geech.gnu.ai.mit.edu (Ray Cromwell) writes:
>>
>>One new feature, CDXL, will let developers display video images
>>from a CD-ROM disk on screen. Limited to images covering about one
>>third of the screen because of the amount of data that must be
>>transferred, CDXL is an interim solution until the Motion Picture
>>Expert Group (MPEG) standard is completed.
>
>   Wasn't the MPEG standard completed last December?  If so, I don't
>know what Commodore is waiting for.

No, it's not yet completed. Perhaps you mix this up with JPEG, the
standard for still pictures.

>>Commodore announced plans to make CDTV compatible with Kodak's new
>>Photo CD system.
>
>   This sounds nice, but the problem is that the CDTV's color 
>capabilities are hardly photographic, especially compared to the CD-I
>systems.  Unless the color capabilities of the CDTV are drastically
>improved, the limited color of the CDTV will not do justice to 
>digitized true-color stills.

Typically Marc. You *must* (you all, not only Marc!) look at those
pictures found in the World Vista Atlas CDTV title (others tell me
that also that CD with "New Weapon technology" or similar has
outstanding images, didn't see them myself until now)!!! Many of
these pictures are really photo quality. I only saw comparable
quality in that one Fish disk (was it 196?) with racing cars, a
honda cycle and an airplane. - This boils down for me that the HAM
mode of the Amiga still can beat very 256 color VGA plain to the
ground, if, yes *IF*, you use a VERY GOOD algorithm to convert your
raw picture into HAM. There must be some black magic with dithering
and all this. For me, I didn't succeed with such an algorithm, I
tried, but got always very clear bandings with weird transition
colors. Funnily, also a few pictures on the mentioned World Vista CD
show these aliases, but they are really few, compared to all the
beautiful ones. Now if somebody could teach us a little about the
magics of HAM algorithms...

I crosspost this to c.s.a.multimedia.

-- 
Best regards, Dr. Peter Kittel  // E-Mail to  \\  Only my personal opinions... 
Commodore Frankfurt, Germany  \X/ {uunet|pyramid|rutgers}!cbmvax!cbmger!peterk