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000288_owner-lightwave-l _Wed Jan 25 16:06:59 1995.msg
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id LAA21986; Wed, 25 Jan 1995 11:35:50 -0800
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From: Kenneth Jennings <kenneth@daffy.aatech.com>
X-Mailer: SCO System V Mail (version 3.2)
To: lightwave-l@netcom.com
Subject: Square Pixels - was re: Mac compat...
Date: Wed, 25 Jan 95 14:24:59 EST
Message-ID: <9501251425.ab10486@daffy.aatech.com>
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Jeric@cup.portal.com
wrote about Re: Mac compatibility
>> Joe Angell writes:
[square pixels in LW?]
>>>>That'll use square pixels. I guess you can't blame Macs for being the
>>>>least compatible of computers -- but you can blame Apple...
>>>-- Joe
>>>This is incredibly wrong-headed. Square pixels are a boon to those
>>>working in 2D animation--ever rotate a brush in DPaint?
[Ken says, square pixels == DTP laser printer]
>>>For the Amiga to slavishly have rectangular pixels like the IBM piece
>>>o' crap was a serious shortcoming.
>>
>>NOT! The Amiga was designed for video applications, so as a
[Ken says, Video pixels != square pixels]
>Bunk. A Mac display can be encoded to video, the pixels are still
>square , what's the problem?
The Amiga video hardware is precisely tuned/timed to the
NTSC carrier frequency. The pixel timing is exactly a
fraction of an NTSC color clock. The end result is that
an Amiga high-resolution pixel which is precisely 1/4 the
size of an NTSC color clock change and one scan line tall
will not and can not be square. The Video Toaster frame
buffer's aspect ratio is the same as Amiga hi-res for
exactly the same reasons.
If you see a Mac display showing square pixels and it
has exactly the same aspect ratio when converted to video
it means that the Mac's video pixels are being crammed
into the NTSC color clocks unevenly. As a result you
*will* also see vertical color banding shifts and artifacts.
This is why nobody I know who does video for a living
would even consider genlocking Mac graphics or using a Mac
for titling.
>2D rotation of brushes is a major pain in the butt on the Amiga, and
>square pixels would have fixed it.
Most of the 'problems' in 2D rotation are inherent to DPaint.
Rotate images in ADPro and you'll get better results.
>Just cuz I prefer the Amiga didn't mean I became an apologist for it.
A superior video architecture is nothing to apologize for.
+-------------------------------------+ +-------------------------------------+
| Kenneth Jennings, Amiga Advocate | | ====== Equine Video Studios ====== |
| "Happy I'm not a PC/Mac lemming." | | ====== & SyntheToonz, Inc. ====== |
| kenneth@daffy.aatech.com | | >>>>>>>> Lynn, Video Maven <<<<<<<< |
| Applied Automation Techniques, Inc. | | > Ken, Computer Animation Artiste < |
| Obviously not the opinions of AAT. | | >>>>>>> Bruno The Wonder Dog <<<<<< |
+-------------------------------------+ +-------------------------------------+
"You'd think that PC and Mac users willing to gut their systems to achieve the
Amiga's level of performance would just save themselves the trouble and buy
Amigas in the first place. But they don't know any better -- they read BYTE."