Re: Is 16x9 really 16x9?

"David McCall" <david.mccall@xxxxxxxxxxx> schreef in bericht
news:QZYXe.15777$Zg5.8188@xxxxxxxxxxx
> Well there are a few ways to look at it
>
> NTSC DV video is 720 x 480. The same resolution be it
> 16 x 9 or 4 x 3.
>
> Simple math tells you that neither of those ratios work out to
> 720.
>
> No matter what the actual pixel count of a camera or display,
> there is going to be some stretching and squeezing to cram a
> 720 x 480 image (as recorded on the tape) into 16 x 9 or 4 x 3.
> The reason is that most CCDs, LCDs, and other display and
> camera technologies have square pixels, but 720 x 480 DV
> resolution assumes rectangular pixels. Taller than wide in
> one case, and wider than tall in the other case.

The important thing is that camcorders having a 16:9 option should use all
scan lines (480 in NTSC and 576 in PAL) instead of first masking top and
bottom and then stretching the image vertically to form an anamorphic image.
More and more consumer cameras with megapixel chips (Sony, Canon) do this
correctly, they form an 16:9 image using the full chip and then squeeze it
horizontally to fit in the 720x576/480 matrix. This can be checked by
switching from 4:3 to 16:9 and then observing the image in the viewfinder.
If it shows more in the horizontal plane, it is OK. If it doesn't, it is
pseudo widescreen. My new camera (Canon MVX330i in Europe or Canon Elura 85
in the USA) does this correctly and is very reasonably priced for what it
offers.
--
Lou van Wijhe
Website: http://home.hccnet.nl/jl.van.wijhe/
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