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

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Old January 27th, 2010, 10:15 AM   #1
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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 :)
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Old January 27th, 2010, 12:50 PM   #2
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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.
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Old January 27th, 2010, 06:26 PM   #3
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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
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Old January 27th, 2010, 07:09 PM   #4
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Yep....

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

Shoot the same scene at ISO 640 and see what you get.
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Old January 27th, 2010, 07:19 PM   #5
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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. :)
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Old January 27th, 2010, 07:24 PM   #6
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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.
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Old January 27th, 2010, 07:32 PM   #7
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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.
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Old January 27th, 2010, 07:39 PM   #8
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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. :)
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Old January 27th, 2010, 07:46 PM   #9
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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. :)
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Old January 28th, 2010, 08:26 AM   #10
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Thanks everyone - i'll play around and see how it goes.
dn
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