confused - cvbs, s-video, RGB?

Real dummy - apologies.... my research tells me CVBS (component) is worst,
s-video next and RGB best.
Simple problem - obviously want best picture from my freeview box to my
Video Projector - freeview box has 2 scarts and s-video output and can be
set to cvbs or rgb on the scarts and of course s-video on s-video socket!
If RGB is really best how do I connect to Projector which has 2 vga
connectors, s-video and composite inputs?, Surely not scart to composite or
s-video?

any guidance much apprecited

Peter G wrote:
Real dummy - apologies.... my research tells me CVBS (component) is
worst, s-video next and RGB best.

CVBS is composite, not component. Other than that, your list is correct.
Component is on a par with RGB.

Simple problem - obviously want best picture from my freeview box to
my Video Projector - freeview box has 2 scarts and s-video output and
can be set to cvbs or rgb on the scarts and of course s-video on
s-video socket! If RGB is really best how do I connect to Projector
which has 2 vga connectors, s-video and composite inputs?, Surely not
scart to composite or s-video?

I think you're going to have to go with the s-video, which should look
pretty good (given the source limitations!). Avoid composite.

I may be wrong, but I suspect the projector will not be able to sync with a
normal TV RGB signal, even if you connect it up with a suitable adaptor
cable. If you have the detailed specs, that would help me to give a more
certain answer!

Pyriform wrote:
Peter G wrote:
Real dummy - apologies.... my research tells me CVBS (component) is
worst, s-video next and RGB best.

CVBS is composite, not component. Other than that, your list is correct.
Component is on a par with RGB.


I had wondered about this. By RGB I take it you mean SCART. I find that
component is generally sharper with more (or better handling of) detail
than SCART RGB. A case in point is Freeview - files recorded on Freeview
played back through a component capable player are sharper, colours more
vivid, and less pixelated.

Rob

"Pyriform" wrote in message
...
Peter G wrote:
Real dummy - apologies.... my research tells me CVBS (component) is
worst, s-video next and RGB best.

CVBS is composite, not component. Other than that, your list is correct.
Component is on a par with RGB.

Simple problem - obviously want best picture from my freeview box to
my Video Projector - freeview box has 2 scarts and s-video output and
can be set to cvbs or rgb on the scarts and of course s-video on
s-video socket! If RGB is really best how do I connect to Projector
which has 2 vga connectors, s-video and composite inputs?, Surely not
scart to composite or s-video?

I think you're going to have to go with the s-video, which should look
pretty good (given the source limitations!). Avoid composite.

I may be wrong, but I suspect the projector will not be able to sync with
a normal TV RGB signal, even if you connect it up with a suitable adaptor
cable. If you have the detailed specs, that would help me to give a more
certain answer!

RGB for "TV" has only three cables plus ground if memory serves. The sync.
is carried on one of the colour lines (green I believe).
VGA has separate sync. lines and uses more lines.
You can certainly combine VGA into RGB so I suppose you can probably go the
other way. Look around for suitable converters on the internet and read the
reviews before leaping ;-).

Paul DS.

Rob wrote:
I had wondered about this. By RGB I take it you mean SCART. I find that
component is generally sharper with more (or better handling of) detail
than SCART RGB. A case in point is Freeview - files recorded on Freeview
played back through a component capable player are sharper, colours more
vivid, and less pixelated.

I think you might need to double-blind your tests - sharper and more
vivid I could believe (although it's probably more down to individual
differences between output circuitry than down to any inherent
difference between RGB over SCART and component), but I don't know how
it could be less "pixelated". A better video connection should make the
"pixelation" - presumably compression artifacts - _more_ obvious, not less.

What are you comparing; you say "files recorded on Freeview played back
through a component capable player". Are you comparing output straight
from a Freeview decoder with a file that has been through some other
process to allow it to play on the component capable player? What
processes are involved, and is it possible that some form of picture
processing has been done during that?

--
Angus G Rae Science & Engineering Support Team
Computing Services
University of Edinburgh
The above opinions are mine, and Edinburgh University can't have them

"Peter G" wrote in message
...
Real dummy - apologies.... my research tells me CVBS (component) is worst,
s-video next and RGB best.
Simple problem - obviously want best picture from my freeview box to my
Video Projector - freeview box has 2 scarts and s-video output and can be
set to cvbs or rgb on the scarts and of course s-video on s-video socket!
If RGB is really best how do I connect to Projector which has 2 vga
connectors, s-video and composite inputs?, Surely not scart to composite
or s-video?

any guidance much apprecited

I would get an RGB SCART to VGA adaptor if your projector supports it (which
it should). VGA has separate RGB components too.

Z

"Rob" wrote

I had wondered about this. By RGB I take it you mean SCART. I find that
component is generally sharper with more (or better handling of) detail
than SCART RGB. A case in point is Freeview - files recorded on Freeview
played back through a component capable player are sharper, colours more
vivid, and less pixelated.

For the simple 480/576 line interlaced case, and ignoring sync signal
handling, the conversion between the picture elements of RGB and component
is a straightforward arithmetic operation (see, for example,
http://www.fourcc.org/fccyvrgb.php). This can be trivially implemented in
the digital or analogue domains with no visible effect on the picture. If
you are seeing any difference, and especially any difference in pixelation,
it must be down to some quirk in the player or display device (for example,
a scaler in the component output), and not an inherent difference between
RGB and component.

John Howells

Rob wrote:
Pyriform wrote:
Peter G wrote:
Real dummy - apologies.... my research tells me CVBS (component) is
worst, s-video next and RGB best.

CVBS is composite, not component. Other than that, your list is
correct. Component is on a par with RGB.


I had wondered about this. By RGB I take it you mean SCART.

Only if the SCARTs at either end are actually using RGB. It ain't
necessarily so. Check this carefully before reaching conclusions. You also
need a decent (not 'expensive'!) cable.

I find
that component is generally sharper with more (or better handling of)
detail than SCART RGB. A case in point is Freeview - files recorded
on Freeview played back through a component capable player are
sharper, colours more vivid, and less pixelated.

I used the phrase "on a par" to avoid committing myself to the exact order
of quality, because that will depend on other factors. RGB and 'component'
(YUV) are both technically component video formats. Component video gives
you luminance (Y) plus two colour difference signals (B-Y) and (R-Y). The
Green signal is implicit; it's just Y-B-R. Component video saves on
bandwidth, and is the native storage format for DVD.

RGB is what ultimately drives the display, irrespective of whether it's a
CRT, an LCD or a plasma. So a component input will get converted into RGB
internally, but that's a fairly trivial (and in principle lossless)
transformation. How well it is done still depends on the quality of the
decoder matrix, however, so it might be that your TV does a better job than
your player.
..

"Paul D.Smith" wrote

RGB for "TV" has only three cables plus ground if memory serves. The
sync.
is carried on one of the colour lines (green I believe).

For the record, RGB for TV via SCART uses four lines. The sync is on what is
usually the composite line, which sometimes contains the whole composite
signal. For proper operation pin 16 is also relevant, indicating whether the
RGB is enabled. Some TVs that do not allow manual mode selection will not
display RGB via SCART unless pin 16 is working properly.

John Howells

Zimmy wrote:
"Peter G" wrote in message
...
Real dummy - apologies.... my research tells me CVBS (component) is worst,
s-video next and RGB best.
Simple problem - obviously want best picture from my freeview box to my
Video Projector - freeview box has 2 scarts and s-video output and can be
set to cvbs or rgb on the scarts and of course s-video on s-video socket!
If RGB is really best how do I connect to Projector which has 2 vga
connectors, s-video and composite inputs?, Surely not scart to composite
or s-video?

any guidance much apprecited

I would get an RGB SCART to VGA adaptor if your projector supports it (which
it should). VGA has separate RGB components too.

http://www.js-technology.com/index.p...9ff0 572a9185

is an excellent choice & currently down in price to 99ukp. See
uk.media.home-cinema for comments on it.

--
Michael
m r o z a t u k g a t e w a y d o t n e t