Luma discussions

From: Bo Herrmannsen <>
Date: Mon, 20 Feb 2017 14:54:59 +0100
Message-ID: <>
2017-02-20 14:49 GMT+01:00 <>:

> > On 2017-02-20, at 13:32, smf <> wrote:
> >
> >> The "dust" he writes about applies to my understanding only to the
> "modern plasma TV" he used and which I expect does bad job handling off
> specs signals.
> >
> > Old tv's are blurry
> Old TVs usually yes. CRTs in general not necessarily. I still use
> well-kept hi-res studio displays, which give picture far from being blurry.
> > and uses anlogue processing.
> ... which is the key here. No quantisation into few bits of depth
> resolution, no timing quantisation, trying to put square peg of
> non-compliant signal into round hole of "expected" timing, etc.
> > Plasma TV's have crisper pixels & depending on the TV and how it's setup
> could have less than 8 bits of colour resolution per channel.
> Exactly. That's one part of what I mean when writing that ADCs there may
> do a job ranging from decent to horrible when given an off-specs output
> from the 64. I have seen all of those. His plasma apparently fits into the
> latter category.
> > This makes irregularities in the video signal more visible, which is
> especially worse if the plasma TV has a much larger screen size.
> Upscaling the artefacts to big screen plays an important role too, but
> when using a device that handles the signal gracefully, this is not that
> much of a problem. Been there, seen that.
> Summing up - my initial comment applies to CRTs and well behaving
> upscalers. The differences we started discussing about might be
> substantially more pronounced when using a device that doesn't know how to
> handle the signal but I would like to use such a device in the first place.
> I would advise the guy to put a decent upscaler between the 64 and his
> modern plasma TV instead.
> --
> SD!
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Received on 2017-02-20 14:02:49

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