On 28/05/2024 08:21, JMB99 wrote:
A friend from US has just been visiting me.
When he got home, he made this comment.
"We’re back home and (his wife) commented on the clarity of the UK soap that she has been watching. To me, it looks as if they are recording at
a greater quality than 4K. Everything is in focus from near to far and
it almost seems to be 3D.
That may be due to lighting and optical choices. Contrast (AKA gamma)
also has an effect on perceived "solidity" of an image. Edge enhancement
can also be applied when compressing the data for broadcast. You also
need to check that both receivers are set up in the same way. This is a
lot easier than it used to be...
If you have a video camera that can connect to your computer, you can
simulate all these effects using even a basic program such as Microsoft
Movie Maker or whatever they call it nowadays. It can also be done using
still pictures using your favourite image editor.
More light when shooting gives better depth of field as the aperture can
be smaller, though with modern sensors, you can also play off aperture
against sensor gain, which has an effect on noise, which changes noise affecting perceived sharpness as well as changing the required bandwidth
for digital compression.
The same used to apply when using film. More sensitive film (Or slow
film which had been push processed, common on news footage) had bigger
grain.
I remember the BBC recording things for future receivers.
They have always worked to the best available standards. They currently
specify a higher source bit rate for digital programming than some other programme distributors. This reduces digital artifacts and allows better quality upscaling.
We noticed something similar when watching the film at the Sphere, which
is 18K."
The published spec for the Sphere is 16,000 pixels by 16,000 pixels,
which works out at 1,600 pixels per square foot ( About 3 pixels per
inch) on the screen. These figures are meaningless when comparing it
with other formats, as you are viewing the Sphere images from much
further away than almost all other formats. If you are watching a 2.35:1
ratio movie (Cinema standardish), then vertical resolution is unlikely
to be more than 6.6 k on the Sphere screen anyway. Most films now are
usually shot at 4K (UHD), and are still being transferred to film for
some markets. 8K is becoming more common.
The Sphere uses minimal digital compression between shooting and
projection, unlike all broadcast formats and most cinemas, and much of
the material is digitally generated anyway.
Any suggestions?
--
Tciao for Now!
John.
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