Re: Why is 3:2 such a problem?


"nappy" <n@xxx> wrote in message
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"David Ruether" <druether@xxxxxxxxxxxx> wrote in message
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"David Ruether" <druether@xxxxxxxxxxxx> wrote in message
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<plenty900@xxxxxxxxx> wrote in message
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I think you are confusing some pixel proportions with picture
proportions. Standard format DVDs are written in 720x480
(NTSC, 4:3), or sometimes 704x480, but the final viewed
product is 640x480 on standard definition NTSC TVs
[using non-square pixels]

no it's not.
it's 720x480
640x480 is D1(720x480) video with the pixel aspect taken into account
to be shown on computer monitors.

I should have said 4:3 without specifying pixel count (except
that can be reasonable along the vertical side, since there are 480
scan lines in NTSC).

486 !

Not so much in this group. You used to be able to distinguish between
profesionals and consumers by how many lines they had in their video
(486 for all pro equipment 480 for consumer equipment ). It has gotten
more blured lately because the DV standard (officially a consumer format)
has been embraced by a many professionals.


In the horizontal direction, the 4:3 proportion
is equivalent in appearance to 640 pixels wide, but it can be any
number, and with analogue displays (as SD TVs are), the pixel
count (the pixels are generally not square if the count is other than
640) affects visual resolution (which is different from pixel-count
resolution). There are formats that are far from 640x480 (even
square) that display in the correct proportions on SD NTSC TVs.
--DR

Too confusing. DV, DVDs, and many other forms of video equipment/software
use 720 x 480 as the standard. If the pixels were square the resolution
would
be 640 x 480, but that tends to look a bit fuzzy. As a result we mostly use
a
resolution of 720 x 480 or 720 x 486 in some profesional equipment. Yes
that is the same as pixel count. Analog video was never directly limited by
a
horizontal pixel count. The horizontal resolution was only limited by the
quality
of the equipment. Composite video is limited to accomodate the color
subcarrier
that is used to modulate the color information onto a black and white video
signal.

David


.

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