Pulldown and "knee" at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders > Canon XL1S / XL1 Watchdog

Canon XL1S / XL1 Watchdog
Can't find it on the XL1 Watchdog site? Discuss it here.

Thread Tools Search this Thread
Old November 13th, 2008, 06:16 PM   #1
Regular Crew
Join Date: Mar 2008
Location: Campbell, California
Posts: 62
Pulldown and "knee"

I just moved up from a GL2 to XL1S (I know, XL1S is old, but so am I). I added a MA100 and a Rode shotgun mic and ready to go but need help with a couple of things. I understand shooting modes, but what is (A) "pull down" in frame mode and (B) Knees?
Thanks for any help,

Ed Space is offline   Reply With Quote
Old November 13th, 2008, 08:11 PM   #2
Join Date: Sep 2001
Location: Northern VA
Posts: 4,298
Knee: (lifted from a post elsewhere by a Laurent Andrieux)
"It has to do with how the highlights will be rendered by the camera.
You see, in video, the high levels are often a problem.
- because one is supposed not have level over 100 IRE
- because the saturated highlights don't look good (no details, chroma problems...)
- because the way video renders signal is not as "smooth" as film does
You can see this when shooting outside for instance, if you have the sky/clouds in the frame.
One solution is to "break" the curve in the highlights, giving it a lower slope, decreasing gamma (contrast) after a certain point.
It will allow you to have details in the highlights as well as being able to record highlights that would be saturated otherwise.
Then, the "knee point" is the point where this break occurs
the slope is the curve's new slope after this point.
When you set it, have a highlight (window, sky, clouds...) in the frame and notice the changes in the settings."

"pull down":
In general "pull down" refers to a method of conversion between images of different frame/field rates, often between film and video. If you check Wikipedia you can find a reasonable explanation under telecine at Telecine - Wikipedia, the free encyclopedia
Or check Pulldown Explained. or
Film and Video 3/2 pulldown explained

Hope the above helps.
Don Palomaki is offline   Reply With Quote
Old November 15th, 2008, 05:25 AM   #3
Join Date: Nov 2007
Location: Bristol UK
Posts: 1,271
Have a look here at a post i started about "knee"


and here to see some knee demos


Round 2
Panasonic HC-X1, Vinten PB, Sennheiser G3 bits. Vegas pro 14 on i7,AMD Radeon RX480 8GB.
Paul Kellett is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders > Canon XL1S / XL1 Watchdog

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 09:11 PM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network