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Ugly Color Bars…
Gentlemen:
Are there any settings you can change in the camera that will effect the color bars that the camera lays to tape?
Also, does the camera properly represent -I and +Q signals in the color bars?
Here is an example of said bars.
I also posted this in the F900 forum, just thought I’d ask here also. Thanks.
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8 Replies
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They just look a little dark to me. Well, pretty dark.
I never use the color bars from the camera anyway…to me they are just 30 seconds of leader. I ignore them.
Shane
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Bars are most useful when they have a direct relationship to the footage. If you really want useful bars, you shoot a physical bar chart on the set with the camera under the actual lighting.
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Bars & tone on camera tape are relics of analog. In the digital age, they are of little use. I wouldn’t recommend recording content to tape from the head, so if you want to record bars or lens cap for 30 seconds, it doesn’t matter.
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[Michael Gissing] “Bars & tone on camera tape are relics of analog. In the digital age, they are of little use.”
Very true. Still, it’s a tradition. And it does get your first frame of action away from the head of the tape!
Arnie
Post production is not an afterthought!
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Those bars are really sick.
Instead of 75% Amplitude and 100% saturation, they are like a 33% amplitude and like a 50% Saturation.
Only the White, 75% Gray and Black are OK.[Arnie Schlissel] “[Michael Gissing] “Bars & tone on camera tape are relics of analog. In the digital age, they are of little use.” “
This is in part true but just because the people have no idea what the bars means and what they are for.
Digital video is based in analog video and without understanding analog is impossible to understand digital.
The bars may be not useful anymore, but all the knowledge hided “behind bars” still being fundamental.
Rafael -
I and Q are signals specific to NTSC and would only be correctly represented in that specific domain. So not only do you really not need it in the digital world, you can’t really create a pure I and Q signal without NTSC.
I don’t know anything about this specific camera, but I found this site talking about the F900:
https://hd24.com/cinealta_users_pub_cat.htm
“Saturation control in the /3 version, apparently when you do turn it on in the camera menu it adjusts the color bar saturation in effect negating its usefulness; this needs to be addressed with a software fix, and while they’re at it, it would also increase the feature’s usefulness if the adjustment were fixed to allow increase as well as reduction of the overall color saturation; now it just allows decrease.”
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bars aren’t useless in the digital age because there is still a LOT of analog video out there. in fact if you only knew how a lot of TV and cable stations still operated….. most can’t even figure out IRE setup should be off, leave it on, and wonder why blacks look washed out when getting digital tapes, and just send it out without a question.
if the tapes are dubs, its very likely there was a problem in the dubbing process.
if these are camera tapes, and it was the /3 model, its a camera adjustment.
the real question is, does the shot material look ok ? if it does, ignore the bars. if its dark, there may be a camera problem. look at the shot material and go from there.
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[Steve oakley] “bars aren’t useless in the digital age because there is still a LOT of analog video out there.”
That is why I said bars on camera tapes. Thankfully broadcasters don’t transmit rushes, although some productions make me wonder if that would be more entertaining.
I still put bars on digi beta & HDCam masters although broadcast techs tell me they never change a machine’s settings regardless of bars. Analog broadcasters who play of analog tape machines might but even in a lot of analog broadcasts, digital playback machines are in use and do not get tweaked per tape.
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