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HVX200 luminance values
I posted this on the FCP forum without much success. I guess I should have known better.
We were running some tests yesterday with the HVX200 and noticed some significant and disturbing luminance discrepancies between what we were seeing on the camera end and what we were seeing inside FCP. In the camera zebras were set at 70% and 80%. When set to 80% we were seeing zebra in the camera viewscreen in highlight areas on a bald, aging white guy
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4 Replies
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I just read something about FCP 5.1.2 and quicktime recording DVCPRO HD im sure something about Gama Shifts or something? im kinda unaware but check this site out https://www.hdforindies.com/ had to be about a week or two ago.
I use the marker setting then try to keep it around 65% to 70%. has not failed me yet especially for outdoor shots.
But could you share some tips and your thoughts on zebras over marker?
alex
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I don’t understand why you guys are metering for such low values. Without getting into the area of “superwhite” and all that stuff, video has always used white at 100% (or, in some places 95%). Granted you can push it a little (“crush the whites”, to say, 105%) but 100% is one of the standard reference points of the signal, the other being pedestal or black level (which can also be allowed adjustment from 0% to maybe 10% these days).
If you are metering whites at 60% – 80% you are naturally going to end up with an “under-exposed” shot.
Try popping it up to 100% and see what happens.
I have been shooting with this cam for about 8 months now (with FCP as my edit environ) and I can tell you there is no shift in the transfer. I will say, though, that you cannot trust the LCD or eyepiece monitor of the 200 for nuances. I have also noticed a disturbing if occasional tendency when shooting 720p in Automatic that it tends to meter very low. When that happens I see the dreary look I think you guys are talking about. But, when that happens I switch to Manual Mode and everything looks just fine.
Try 100% crosshatch.Brian FitzGerald
FitzVideo.com -
WoW if your shooting at 100% That Crazy shooting with the hvx200 at 75% should be the correct target. personaly iv got better resalts underexposing then over.. and iv never been able to save an overexposed shot in FCP.
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I am talking about whites – the maximum luminance in your picture frame. It should be at 100%.
You sound like you come from a film background and are confusing terms. When you say:“WoW if your shooting at 100% That Crazy shooting with the hvx200 at 75% should be the correct target. personaly iv got better resalts underexposing then over.. and iv never been able to save an overexposed shot in FCP.”
I’m not really sure what you are talking about. You don’t “expose” in video; you control your levels by metering white levels. They should be 100%.
From what I could discern, the original post in the thread was complaining about what one experienced in video would call “a muddy looking shot”. That is always from running the level too low. If you guys are running your WHITE levels significantly under 100% that is what you will get.
This is like Video 101.
Study up.
Brian FitzGerald
FitzVideo.com
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