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#1 |
Major Player
Join Date: Mar 2004
Location: Roanoke, VA
Posts: 796
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24f Ghosting
Hello gang,
I'm finally starting to switch to a 24p(f) workflow and have discovered that there is a setting(s) that creates extreme ghosting and trails. I created my own Custom Preset and have not had good results. I switched to AC PREF1 from the library here at DVinfo and get much better results. I'm also trying to get a cool somber look like the outdoor scenes in Children of Men. Could anyone tell me which settings to be careful with, to avoid ghosting? Attached is a screen shot of the settings that I came up with, and Alister Chapmans settings for CP #1 in the library. Thanks.
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Dave Perry Cinematographer LLC Director of Photography • Editor • Digital Film Production • 540.915.2752 • daveperry.net |
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#2 |
Trustee
Join Date: Jan 2006
Location: New York, NY
Posts: 1,267
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Sounds like the noise reductions in the Custom Preset menu.
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#3 |
Major Player
Join Date: Mar 2004
Location: Roanoke, VA
Posts: 796
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So should I not use the noise reduction?
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Dave Perry Cinematographer LLC Director of Photography • Editor • Digital Film Production • 540.915.2752 • daveperry.net |
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#4 |
Wrangler
Join Date: May 2003
Location: Eagle River, AK
Posts: 4,100
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Would be helpful to see a frame grab or short clip so we don't misunderstand what you're seeing. Could be NR1 one if there is a lot of motion in low light, and you're using it. Going to the Advanced Search page and looking for NR1 in this forum will provide a lot of reading on the subject. Here's a start:
http://www.dvinfo.net/conf/showpost....9&postcount=10 http://www.dvinfo.net/conf/showthread.php?t=84881 http://www.dvinfo.net/conf/showthread.php?t=80396 http://www.dvinfo.net/conf/showpost....03&postcount=8 Also, what shutter speed are you using? You'd expect that the slower shutter speeds typically used with 24fps shooting are going to give you more motion blur and accentuate the NR1 ghosting. Another gotcha is that using the Cine settings for gamma and color matrix requires greater exposure, and I believe to a lesser extent the same is true for the negative values in the color gains and matrices so if you're struggling with inadquate lighting, might be the lesser of evils to avoid those, even if it means some additional tweaking in post.
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Pete Bauer The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. Albert Einstein Trying to solve a DV mystery? You may find the answer behind the SEARCH function ... or be able to join a discussion already in progress! |
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#5 |
Major Player
Join Date: Mar 2004
Location: Roanoke, VA
Posts: 796
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Thanks Peter and Daniel. I'm working on some new presets without NR1 and will let you know what happens. In the mean time, I've posted some screen shots and video clips at www.cartermedia.tv/DVinfo_samples
The movie clips are HDV 24p out of FCP Studio 2. The footage was shot in 24f using a Redrock Micro with a Nikon Nikkor S 50mm set at f2. Camera settings: Sequence_3_dp.mov and Sequence_3_dp2.mov - AE Shift 0, shutter 1/100, exposure locked and then +1 Sequence_3_dp3.mov - same as above but with shutter at 1/60 and AE Shift +.5 The ghosting is very apparent in red highlights and people's faces. The faces look like they are melting off. Kind of like Tom Cruise's face when he takes that shot in Minority Report. Also notice ghosting in the arm in Sequence_3_dp3.png. Thanks for the suggestions and help.
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Dave Perry Cinematographer LLC Director of Photography • Editor • Digital Film Production • 540.915.2752 • daveperry.net |
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#6 |
Trustee
Join Date: May 2003
Location: Atlanta GA
Posts: 1,427
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is skin detail on?
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I have a dream that one day canon will release a 35mm ef to xl adapter and I'll have iris control and a 35mm dof of all my ef lenses, and it will be awesome... |
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#7 |
Major Player
Join Date: Mar 2004
Location: Roanoke, VA
Posts: 796
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All Skin Detail settings are at default with the Detail setting off.
Hue - 0 Chroma - 0 Area - 0 Y Level - 0 Skin Detail - off
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Dave Perry Cinematographer LLC Director of Photography • Editor • Digital Film Production • 540.915.2752 • daveperry.net |
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#8 |
Inner Circle
Join Date: Dec 2002
Location: Augusta Georgia
Posts: 5,421
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Turn off Noise Reduction 1.
This will cause ghosting in low-light conditions. Do not use Noise Reduction 1 unless you are locked down on a tripod. It is even better to avoid this at all times.
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Dan Keaton Augusta Georgia |
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#9 |
Trustee
Join Date: May 2003
Location: Atlanta GA
Posts: 1,427
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Dan's absolutely right. I didn't look at the settings before I asked my question. Turn of NR1 and then see if ghosting is still there.
__________________
I have a dream that one day canon will release a 35mm ef to xl adapter and I'll have iris control and a 35mm dof of all my ef lenses, and it will be awesome... |
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