canon mark ii : clip with moire, noise

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deleuze3

Well-known member
Hi, i record this 30 sec video on camera 5d mark ii.
https://www.youtube.com/watch?v=cXzqdxmtsN8&feature=youtu.be


It was at 6400 ISO. It was not in the dark. There was light in the room.
There is a lot of noise, and moire.

It suprised me (i had the picture style at neutral) and the color look saturated.


The aperture must have been quite closed since there is much depht of field.
(sound is bad, it was the built-in mic)

With the compression in H264, the moire and the noise appear less pronounce (the image look a bit softer too). Overall, its better.

What are your thoughts?
what i should have done differently ?

Thanks in advance,
deleuze3
 
The main problem here is that, the image is underexposed, there's tons of dark shadows so of course they'll show noise,

So the solution is, pump up the exposure to the highest point before highlights clip (called ETTR), this can be done with either opening the iris or decreasing shutter or adding light., then in post bring down the exposure to desired point.

Second the picture profile is too contrasty and saturated. If you're going to be grading, set it to Neutral and turn contrast and sharpening and saturation all the way off.

6400 ISO is way above the usable limit of the 5D mkII. I wouldn't go above 1600 in fact otherwise noise gets very intruding. So shooting at 6400, with a closed down iris, and underexposing with lots of blacks + contrasty PP = this look.
 
Here's an example of what I mean saying you're underexposing.

Here's a slightly underexposed image with the contrast/saturation not turned off
UUtCgFm.jpg


This is one using the ETTR technique (raising exposure to decrease noise), with contrast/saturation all the way off
3HjJ8IV.jpg


Here's both when you grade them to normal point:
ga2y4PU.jpg

SnMwB9N.jpg


In fact, the first noisy one of the two graded images above is at 320 ISO, while the bottom clean one is at 3200 ISO, with the same settings/light and everything, yet the 320ISO shows significant noise because the image is underexposed.

It's underexposure that creates noise, not high ISOs.

Expose highly and push down in post + turn contrast/saturation all the way off, this is the secret to getting high IQ with Canon DSLRs.
 
I should expose more (brighter) and dark the image in post?

If i use manual lenses, i should always over expose a bit in order to avoid noises ?

Here is a footage i did :
https://www.youtube.com/watch?v=rMbz...ature=youtu.be
I recorded the video a bit overexposed, then at 35sec, i adjust the exposure in post to be darker. What do you think about the result ?

Did i use the appropriate method ? Can someone helps ?

Thanks in advance,
 
I've read the test, thanks.
im not sure if i understand it well.I read this thread several times, but i don't seem to resolve the issue.

Here is a clip i did : http://youtu.be/Z-aHcm1EmfM

I have a canon 60d.
ISO : 1600
Shutter speed: 50
Iris : completely open

There is noise since the scene is not well lit.

To minimize noise, what should i do ? (I should have put the iso at 3200??)

thanks in advance for your understanding.
 
Yes, you could have over exposed by a stop and went to 3200ISO, at the expense of having less dynamic range in the graded shot. The drawback to this is that less dynamic range means the windows would probably be entirely blown out and unrecoverable.

Typically the talked above method of ETTR is used with film or high bit depth footage (12/16 bit) where there is more dynamic range to work with than is possible to display in an 8bit display. By doing ETTR in an 8bit environment (where there is 8 stops of dynamic range or more) you are sacrificing visual information.
 
deleuze3 said:
I've read the test, thanks.
im not sure if i understand it well.I read this thread several times, but i don't seem to resolve the issue.

Here is a clip i did : http://youtu.be/Z-aHcm1EmfM

I have a canon 60d.
ISO : 1600
Shutter speed: 50
Iris : completely open

There is noise since the scene is not well lit.

To minimize noise, what should i do ? (I should have put the iso at 3200??)

thanks in advance for your understanding.
Click to expand...

That's a very very high dynamic range scene, you shot it well.

Do you have Neat Video? since you're bothered with noise it's a magical noise removal plug-in.
 
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