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Old January 8th, 2013, 01:16 PM   #16
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Re: How Much More Image Quality Will 4:2:2 Uncompressed 5d Mk III Really Provide?

I think the gains of 4:2:2 are marginal, unless you are keying. The bigger advantage (or disadvantage) is the external codec. If it's much better, the images will be much better. And, yes, the extra chroma samples of 4:2:2 might help reduce chroma noise and block artifacts.
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Old January 9th, 2013, 08:38 AM   #17
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Re: How Much More Image Quality Will 4:2:2 Uncompressed 5d Mk III Really Provide?

I hope that the 4:2:2 will help with less banding, but maybe it needs to get up to 10 bit for that. Hopefully Canon is able to send an clean uncompressed signal AND also keep icons on the 5DIII LCD and record internally. I hope that's the reason why it is taking so long time.
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Old January 11th, 2013, 08:34 PM   #18
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Re: How Much More Image Quality Will 4:2:2 Uncompressed 5d Mk III Really Provide?

Yeah, banding is related to bits, rather than colorspace bandwidth. You can minimize banding by adding noise, but it has to be added before the 8-bit truncation/rounding.

When grading in post, make sure to work in a 16-bit of floating point mode. Then you can add dither to reduce banding due to the grading process. In fact, I think a lot of people have bashed 8-bit cameras not because of the 8-bit source image but because of the additional banding added when doing 8-bit post work.
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Old February 28th, 2013, 09:21 PM   #19
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Re: How Much More Image Quality Will 4:2:2 Uncompressed 5d Mk III Really Provide?

What's banding?
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Old March 1st, 2013, 12:23 PM   #20
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Re: How Much More Image Quality Will 4:2:2 Uncompressed 5d Mk III Really Provide?

I think banding is the wrong term for what's being described. I believe that the lack of bit depth on smooth gradients causes an artifact that is called "contouring", which shows hard steps, rather than smooth changes over a nearly flat image, like the sky, a plain wall, or a balloon. It looks similar to the contours that one sees on a topographical map.

I believe that banding is the artifact that we get from rolling shutter - typically light or dark horizontal bands across the image - that happen when the shutter speed doesn't match the frequency of fluorescent lights or when there are strobes/flashes in the scene.
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Old March 8th, 2013, 02:40 PM   #21
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Re: How Much More Image Quality Will 4:2:2 Uncompressed 5d Mk III Really Provide?

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Originally Posted by Nigel Barker View Post
The basic flaw is that it mirrors the LCD & you cannot remove the overlays.
What do you mean by that? That the HDMI signal was not meant for recording?
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Old March 8th, 2013, 04:26 PM   #22
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Re: How Much More Image Quality Will 4:2:2 Uncompressed 5d Mk III Really Provide?

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Originally Posted by Alex DeJesus View Post
What do you mean by that? That the HDMI signal was not meant for recording?
Correct! At least that is the current situation that the promised new firmware is supposed to correct.
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