Quality difference between the new 10/12bit raw and good old 14 raw

[Levas]

Hello pixelpeepers,

I was wondering if people already seen/tested the difference in video quality of 10bit magic lantern raw vs 14 bit magic lantern raw.
I've used 10 bit raw today in the real world. And I'm used to color aliasing, and in most cases I have no problem in removing the color aliasing.
But the footage I shot today got very hard to remove, or almost impossible to remove, color aliasing.
Could it be explained in the difference between 10bit vs 14 bit, could that give more color aliasing ?
Or was it just a coincidence, since I shot a lot of bricks today, while visiting an old castle

[dfort]

What camera at which video mode? Less aliasing in crop modes and with 5D3.

[Levas]

Canon 6d, so I'm used to some color aliasing.
Just wondering if there could be a scientific explanation if 10 bit could create more color aliasing.
There are less color gradations in 10 bit...but it could also be that there were just too many bricks in my shots today.
So curious if other people see any difference in 10 vs 14 bit

[a1ex]

I'm not sure how you can discuss this without pictures.

Just my 2c.

Not relevant for aliasing, but...
http://www.eoshd.com/comments/topic/21004-12-or-10-bit-raw-magic-lantern/?page=3#comment-168058

[Levas]

Real live shooting, so lots of family in the video 
But I have found a frame without people in it, uploaded it to:
http://drive.google.com/drive/folders/0B1BxGc3dfMDaRmtKc2tOa3dHMTA?usp=sharing

I only shot 10bit that day, so I don't have any frames from that day in 14 bit to compare it with.

Thanks for the interesting link to the forum on EOSHD.
Good to see some comparisons between 10 and 14 bit. 

[a1ex]

Definitely not caused by the bit depth. Trim 2 bytes to get 8-bit linear raw => this DNG.

BTW, why not trying some super resolution algorithms on this footage?

[Levas]

Color moire/aliasing still the same in the 8 bit dng, so must be caused by shooting bricks...

Do you mean you want to try some super resolution algorithms ?
I have about 45 frames of this castle, before I start panning to the right...
Uploading frame 0 to 45 right now, takes about half an hour.
Same link as before.
http://drive.google.com/drive/folders/0B1BxGc3dfMDaRmtKc2tOa3dHMTA?usp=sharing

[a1ex]

Do you mean you want to try some super resolution algorithms ?

First attempt seems promising: https://www.magiclantern.fm/forum/index.php?topic=20999

[erikbaldwinson]

Hello pixelpeepers,

I was wondering if people already seen/tested the difference in video quality of 10bit magic lantern raw vs 14 bit magic lantern raw.
I've used 10 bit raw today in the real world. And I'm used to color aliasing, and in most cases I have no problem in removing the color aliasing.
But the footage I shot today got very hard to remove, or almost impossible to remove, color aliasing.
Could it be explained in the difference between 10bit vs 14 bit, could that give more color aliasing ?
Or was it just a coincidence, since I shot a lot of bricks today, while visiting an old castle

Just recorded 14bit, 14bitlossless and 12bitlossless. 14bit looks better in every way. The differences are most noticeable with motion and colour as opposed to pixel peeping for sharpness and noise or something - although the noise is definitely lower with 14bit as well. There is depth and strength there that just does not exist with lossless. Lossless is great though, the small file size to quality ratio is awesome and practical.

[Levas]

Are you sure 14bit lossless looks not as good as 14 bit ?

Because lossless means, lossless as in no quality loss...
For compression with quality loss the therm 'lossy' is used.
I think the 14 bit lossless files should be identical to the normal 14 bit files.
As far as I know it uses an non destructive algorithm to make file size smaller.

 

[a1ex]

After decompression, 14-bit lossless is identical to uncompressed.

(6D is an exception - each channel differs by a constant offset, but other than that, the image data is identical here as well)

(That means, 14-bit lossless will give raw data identical to uncompressed 14-bit (100% identical, not one single bit different, contrary to some earlier report), while "12-bit lossless" should be interpreted as "14-bit to 12-bit conversion - lossy by definition - followed by lossless compression", so it should have the same number of useful levels as uncompressed 12-bit. Please note the 12-bit lossless is not identical to 12-bit uncompressed - they differ by a constant value and possibly by some round-off error, and the same is true for lower bit depths.)

[erikbaldwinson]

After decompression, 14-bit lossless is identical to uncompressed.

(6D is an exception - each channel differs by a constant offset, but other than that, the image data is identical here as well)

Yes this is my mistake. The differences I am witnessing are between 14 and 12 bit.

[a1ex]

Do you mind sharing a short clip that shows the difference?

If possible, also a few DNGs.

[erikbaldwinson]

Do you mind sharing a short clip that shows the difference?

If possible, also a few DNGs.

https://www.dropbox.com/sh/67vforsr9ovuc86/AAB_ON_F-UNEugiSXh7AnCuta?dl=0

14bit shadows pull better and overall image looks better - more depth.

[a1ex]

Unable to compare, please use a tripod...

[erikbaldwinson]

Unable to compare, please use a tripod...

Hey Alex you're welcome to run your own test on your own terms. If you want to save the time, open the dngs in photoshop and raise the shadows. The result is apparent. Also, 14-bit footage looks better in general.

[a1ex]

I'm not going to - it's your claim and your job to prove it.

The two DNGs you've posted do not even have the same brightness, so they simply cannot be compared for this case. All I've asked for was a test where this difference is visible.

[erikbaldwinson]

I'm not going to - it's your claim and your job to prove it.

The two DNGs you've posted do not even have the same brightness, so they simply cannot be compared for this case. All I've asked for was a test where this difference is visible.

I think I have. The difference is mostly in the quality and definition of the shadows. I watch the footage on my monitor and the 12-bit doesn't have a definition in the shadows that the 14-bit does. The additional noise of 12-bit is obvious when you lift the shadows of both dngs.

I think both are awesome.

[a1ex]

From https://www.magiclantern.fm/forum/index.php?topic=19300.msg193613#msg193613 - 10-bit lossless looks cleaner to me than 14-bit:

14-bit, 10-bit lossless black=2048, 10-bit lossless black=2047; rendered with dcraw -a -b 8:

When the brightness in the two images is different, the noise will also be different. Make sure the bit depth is the only variable that changes in your test images.

[6D_ML]

Here is an example clearly demonstrating the difference in quality between 10 & 14 bit recording after raising blacks & shadows in post: http://www.magiclantern.fm/forum/index.php?topic=5601.msg195034#msg195034

[viral kapadia]

Hi I can not convert 10bit MLV to DNG using RAW2DNG or MLV_DUMP. I convert it using MLV converter but image looks pink and noise

[qqqavi]

How do you change the bit depth?


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