50 hertz light flicker
by Graham Saywell
on
Jul 28, 2009 at 3:45:32 pm
Hi Folks.
Currently onlineing an episode of a series that was shot in Spain and am seeing quite allot of flicker on interiors with flouresant lighting.
This seems to be because of the camera(s) on a 120 60htz power cycle vs the lighting at 220 50 htz. Footage was captured on an XDCam HD camera at 30i.
Is anyone aware of a reliable method of removing the flicker from these shots. I have tried 3 prong Deflicker with poor results.
Re: 50 hertz light flicker by grinner hester on Jul 28, 2009 at 4:43:30 pm
naa. You can often strobe at 2 and reduce it but it depends on the action, of cuorse.
You may have some luck with the 3:2 pulldown in your time warp. There just isn't an accurate math equasion in any plugin for this.
Re: 50 hertz light flicker by Terence Curren on Jul 28, 2009 at 5:23:52 pm
[Graham Saywell]"I have tried 3 prong Deflicker with poor results. "
I have had luck with this plugin in the past. Are you sure you are using it correctly? It is not very intuitive.
There are three boxes on the screen. The top left is brightness, the right center is chroma, and the bottom left is darkness.
First you have to analyze where the flicker is happening. If it is on the high end, us the brightness box and parameter pane (which is enabled by default). If it is in the darks, use the dark box and parameter pane and turn of the brightness.
Then place the corresponding box on an area that matches what you are trying to fix. For example, if you are going for the brights, place the brightness box on a bright area that stays constant like a lighter wall. If the shot moves around, you may have to manually track the box. I tend to make the box a small as possible to make it easier to avoid getting anything unwanted in that area.
Now click the options box in the upper left corner of the effects window and set the levels for the shot.
What the plugin does is make sure that whatever is in that brightness box stays the same level throughout the shot as the level you set it for in the options box.
Re: 50 hertz light flicker by Ra-ey Saleh on Jul 29, 2009 at 2:11:38 am
Sapphire also have an effect designed for this in their Time tab called FlickerRemove.
If you don't have the plugin, download the fully functioning demo from:
http://www.genarts.com/download It worked a treat on a similar situtaion we encountered.
