Canon 7D Noise and Pixilation Issue - Please help at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon EOS Crop Sensor for HD

Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.


Reply
 
Thread Tools Search this Thread
Old January 27th, 2010, 10:15 AM   #1
Tourist
 
Join Date: Jan 2010
Location: sydney/ australia
Posts: 3
Canon 7D Noise and Pixilation Issue - Please help

Hi Guys,
I was wondering if someone could help me...
I have a canon 7d and i just can't get any good low light pictures without a load of noise/ pixilation. I was wondering if you could please take a look at my settings/ videos and see if there is anything you can recommend?

Here are some videos where you can see noise on the left side of the subject's head.
YouTube - New Noise Video - desat - Canon 7d.



YouTube - New Noise Video - Canon 7d



(these were exported from AF CS3 as mp4 - so things are a bit blurred, but you can see what i mean from the next vid)

and you can really see it here:
YouTube - Canon 7d - noisy footage issue (desatured) (look at the above right of the subject's head - where the white fades to black... it's like a pixil ant party up there!)

Here are some stills that i extracted from other videos:
http://i974.photobucket.com/albums/a...non7DNoise.jpg

http://i974.photobucket.com/albums/a...oiseColour.jpg

Here are my settings:




Here is the set up I am using:

Canon 7d Body

Lens - Canon 50mm F1.8

Aperture: f1.8

Shutter Speed: 1/50

ISO: 200

24fps 1920x1080HD PAL

White Balance: 5000k (matched to light source)



Light Source 15w CFL Fluorescent lamp, (equivalent to about 60w - 75w incandescent) placed approx 1m away from subject's face.

Camera Settings:

User Def. 1

Sharpness = 0

Contrast = Absolute

Saturation = 2 clicks negative

Color Tone = 0 (default)



Highlight Tone Priority = Enabled

ISO Expansion = Enabled



Converting footage from Canon format to Avid ADxHD codec using MpegStreamClip and editing in After Effects CS3.

All comments are very much appreciated

Thx :)
Dan Neeson is offline   Reply With Quote
Old January 27th, 2010, 12:50 PM   #2
Major Player
 
Join Date: Mar 2006
Location: Dallas, TX
Posts: 346
I don't have experience with Avid formats, but I will say that I would need to see shots of the original to compare noise. The pixelation I see is from YouTube's h.264 compression for web and not related to what the camera shot. If you compress the footage enough with a low bit rate, you will see a lot of blockiness.

I also noticed that some of your uploads were a wrong aspect ratio.
__________________
David Chapman
www.davechapfilms.com
David Chapman is offline   Reply With Quote
Old January 27th, 2010, 06:26 PM   #3
Tourist
 
Join Date: Jan 2010
Location: sydney/ australia
Posts: 3
New Video Example

Thanks Dave,
Here is an uncompressed video that i uploaded straight from the flash card.
Any Thoughts?

YouTube - Uncompressed Video - Noise/ Pixilation Issue
Dan Neeson is offline   Reply With Quote
Old January 27th, 2010, 07:09 PM   #4
Inner Circle
 
Join Date: Nov 2006
Location: Tallahassee, FL
Posts: 4,100
Yep....

Noise = insufficient light
Pixellation = weak h.264 codec in the 7D.

Shoot the same scene at ISO 640 and see what you get.
__________________
DVX100, PMW-EX1, Canon 550D, FigRig, Dell Octocore, Avid MC4/5, MB Looks, RedCineX, Matrox MX02 mini, GTech RAID, Edirol R-4, Senn. G2 Evo, Countryman, Moles and Lowels.
Perrone Ford is offline   Reply With Quote
Old January 27th, 2010, 07:19 PM   #5
Major Player
 
Join Date: Jan 2007
Location: Portland, OR
Posts: 949
Quote:
Originally Posted by Dan Neeson View Post
Highlight Tone Priority = Enabled
One way to reduce noise is to let your highlights blow out by disabling HTP. Personally, I'd rather have the noise. :)
Daniel Browning is offline   Reply With Quote
Old January 27th, 2010, 07:24 PM   #6
Inner Circle
 
Join Date: Nov 2006
Location: Tallahassee, FL
Posts: 4,100
Quote:
Originally Posted by Daniel Browning View Post
One way to reduce noise is to let your highlights blow out by disabling HTP. Personally, I'd rather have the noise. :)
Why? Reduce latitude in the shot and nothing needs to blow out.
__________________
DVX100, PMW-EX1, Canon 550D, FigRig, Dell Octocore, Avid MC4/5, MB Looks, RedCineX, Matrox MX02 mini, GTech RAID, Edirol R-4, Senn. G2 Evo, Countryman, Moles and Lowels.
Perrone Ford is offline   Reply With Quote
Old January 27th, 2010, 07:32 PM   #7
Major Player
 
Join Date: Jan 2007
Location: Portland, OR
Posts: 949
Quote:
Originally Posted by Perrone Ford View Post
Why? Reduce latitude in the shot and nothing needs to blow out.
Because reducing latitude in the shot is not always possible or desired. For example, I don't normally carry a nuclear warhead bright enough to reduce the contrast in mountain landscapes. ;) Other times, I do have the nuke with me, but I just don't want to change the lighting because I like having highlights that are four (not three) stops above mid gray before clipping.
Daniel Browning is offline   Reply With Quote
Old January 27th, 2010, 07:39 PM   #8
Inner Circle
 
Join Date: Nov 2006
Location: Tallahassee, FL
Posts: 4,100
Quote:
Originally Posted by Daniel Browning View Post
Because reducing latitude in the shot is not always possible or desired. For example, I don't normally carry a nuclear warhead bright enough to reduce the contrast in mountain landscapes. ;) Other times, I do have the nuke with me, but I just don't want to change the lighting because I like having highlights that are four (not three) stops above mid gray before clipping.
I didn't mean in all situations.. I mean in THIS situation.

Ands sounds to me like you need to upgrade your arsenal to some include some smart, tactical nukes... Just to even things out a bit. Or you need a RED. :)
__________________
DVX100, PMW-EX1, Canon 550D, FigRig, Dell Octocore, Avid MC4/5, MB Looks, RedCineX, Matrox MX02 mini, GTech RAID, Edirol R-4, Senn. G2 Evo, Countryman, Moles and Lowels.
Perrone Ford is offline   Reply With Quote
Old January 27th, 2010, 07:46 PM   #9
Major Player
 
Join Date: Jan 2007
Location: Portland, OR
Posts: 949
Quote:
Originally Posted by Perrone Ford View Post
I didn't mean in all situations.. I mean in THIS situation.
I see now, thanks. Yes, he may want to do that.

Quote:
Originally Posted by Perrone Ford View Post
Ands sounds to me like you need to upgrade your arsenal to some include some smart, tactical nukes... Just to even things out a bit. Or you need a RED. :)
Or both. That's how they made Book of Eli. :)
Daniel Browning is offline   Reply With Quote
Old January 28th, 2010, 08:26 AM   #10
Tourist
 
Join Date: Jan 2010
Location: sydney/ australia
Posts: 3
Thanks everyone - i'll play around and see how it goes.
dn
Dan Neeson is offline   Reply
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

Z.G.C.
(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 EOS Crop Sensor for HD

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 02:12 AM.


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