"PTRAVEL" <ptravel@ruyitang.com> wrote in message

news:1ssVb.10500$vU6.8324@newssvr29.news.prodigy.com...

> "David Ruether" <rpn1@no-junk.cornell.edu> wrote in message

> news:HzrVb.7726$M8.1881@nwrdny02.gnilink.net...

> > "PTRAVEL" <ptravel@ruyitang.com> wrote in message

> > news:cFmVb.21408$SQ2.5257@newssvr27.news.prodigy.com...

> > > "lathem" <lathem@mindspring.com> wrote in message

> > > news:g_iVb.17102$GO6.5838@newsread3.news.atl.earthlink.net...

> > [...]

> >

> > > The 33's higher resolution is relevant only to still imaging, which is a

> > > useless feature in a video camera.

> > [...]

> > You have said this repeatedly in these NGs, but it is not true. The

> > higher pixel count can provide both better color and higher image

> > resolution in the motion-video image of 1-CCD models - though,

> > all else equal, it will also further-limit low-light range, and if not

> > well-implemented, it can increase motion-artifacting. In the case of

> > the TRV33, the image is better in good light than that of the TRV22,

> > (with little motion-artifacting) but its low-light range is more restricted.

> > --

> > David Ruether

> I thought that this was true only if the camcorder did pixel subsampling,

> and the lowerend ones don't. Also, wouldn't higher pixel densities cause

> more motion artifacts?

>

> However, if I'm wrong, I appreciate the correction and the right

> information.

No pixel subsampling necessary - the image produced by the

CCD is not 1:1 mapped to the output, as I undersatand it. For

full resolution of all colors with filtering of the pixels on a single

CCD, it would take about 3X the 345k or so pixels needed for

best resolution in the NTSC frame using one CCD for all the

colors. In practice, with camcorders using similar lenses (and

likely somewhat similar electronics), comparing the frame-grabbed

image resolution of a camcorder with about 345k active image

pixels with an image from one with about three times that (and

similar CCD size and type) does show (in good light) an

improvement in picture quality for resolution and color (though

the higher pixel count generally does reduce the sensitivity, and

it can result in more motion-artifacting [though not necessarily...]).

For more on the theory/technical-background of this, consult

RGBaker; for the practical results, go here:

http://www.David-Ruether-Photography.com/bright.htm and compare the

3-CCD VX2000 and TRV900 models for picture resolution,

contrast, and color-quality with the TRV30, PC100, and PC9

1-CCD models (the last three have successively diminishing

pixel-counts on their CCDs, and some effects of this appear to

be fairly obvious in the images...).

--

David Ruether

d_ruether@hotmail.com

http://www.David-Ruether-Photography.com