[opendtv] Re: 405 line pictures
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 14 Dec 2006 19:18:58 -0800
flyback1 wrote:
> In Europe, the camera setup standard was different. The grayscale setup
> chart used was different from the one used with NTSC, eleven steps
> instead of nine,
In Europe they did not degrade video dynamic range by introducing the 7.5
percent DC voltage off-set above blanking as an artificial black level
(known as Setup), as is required in the U.S.
As I vaguely recall, Setup was established to compensate for a serious non
linearity in some proprietary imaging device, near black level. This could
account for much of what you describe and as I have also observed.
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of flyback1
> Sent: Thursday, December 14, 2006 3:10 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: 405 line pictures
>
>
>
>
> Mark Schubin wrote:
>
> >
> >
> > Television Digest reported decades ago (in the black-&-white days)
> > about an American television delegation that went to the UK in its
> > 405-line, 3-MHz-video-bandwidth days and found the pictures superior
> > to those in the U.S. There was much discussion about why.
> >
> > TTFN,
> > Mark
> >
> >
> I agree there may have been more care taken in BBC TV production, but I
> also believe the 405 line pictures looked better to the U.S. delegation
> because they had more visible information and detail in the darker parts
> of the image.
>
> In Europe, the camera setup standard was different. The grayscale setup
> chart used was different from the one used with NTSC, eleven steps
> instead of nine,
> and the range of reflectance was also different as was the gamma. This
> still may be the case today.
>
> The result is [as I am remembering, because I can't find my camera
> notebook] the 50% crossover point on a European waveform monitor is
> about 45 IRE whereas
> with NTSC cameras it is around 55 IRE.
>
> This brings the lower levels up by 10 IRE on a European camera, and adds
> subtle shading and nuance in the dark parts of the picture creating a
> more natural looking image.
>
> Sort of like how very old movies shot with low contrast B&W silver
> nitrate film look.
>
>
>
>
>
>
>
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